1# -*- mode:python -*-
2
3# Copyright (c) 2013 ARM Limited
4# All rights reserved.
5#
6# The license below extends only to copyright in the software and shall
7# not be construed as granting a license to any other intellectual
8# property including but not limited to intellectual property relating
9# to a hardware implementation of the functionality of the software
10# licensed hereunder. You may use the software subject to the license
11# terms below provided that you ensure that this notice is replicated
12# unmodified and in its entirety in all distributions of the software,
13# modified or unmodified, in source code or in binary form.
14#
15# Copyright (c) 2011 Advanced Micro Devices, Inc.
16# Copyright (c) 2009 The Hewlett-Packard Development Company
17# Copyright (c) 2004-2005 The Regents of The University of Michigan
18# All rights reserved.
19#
20# Redistribution and use in source and binary forms, with or without
21# modification, are permitted provided that the following conditions are
22# met: redistributions of source code must retain the above copyright
23# notice, this list of conditions and the following disclaimer;
24# redistributions in binary form must reproduce the above copyright
25# notice, this list of conditions and the following disclaimer in the
26# documentation and/or other materials provided with the distribution;
27# neither the name of the copyright holders nor the names of its
28# contributors may be used to endorse or promote products derived from
29# this software without specific prior written permission.
30#
31# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42#
43# Authors: Steve Reinhardt
44# Nathan Binkert
45
46###################################################
47#
48# SCons top-level build description (SConstruct) file.
49#
50# While in this directory ('gem5'), just type 'scons' to build the default
51# configuration (see below), or type 'scons build/<CONFIG>/<binary>'
52# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for
53# the optimized full-system version).
54#
55# You can build gem5 in a different directory as long as there is a
56# 'build/<CONFIG>' somewhere along the target path. The build system
57# expects that all configs under the same build directory are being
58# built for the same host system.
59#
60# Examples:
61#
62# The following two commands are equivalent. The '-u' option tells
63# scons to search up the directory tree for this SConstruct file.
64# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug
65# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug
66#
67# The following two commands are equivalent and demonstrate building
68# in a directory outside of the source tree. The '-C' option tells
69# scons to chdir to the specified directory to find this SConstruct
70# file.
71# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug
72# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug
73#
74# You can use 'scons -H' to print scons options. If you're in this
75# 'gem5' directory (or use -u or -C to tell scons where to find this
76# file), you can use 'scons -h' to print all the gem5-specific build
77# options as well.
78#
79###################################################
80
81# Check for recent-enough Python and SCons versions.
82try:
83 # Really old versions of scons only take two options for the
84 # function, so check once without the revision and once with the
85 # revision, the first instance will fail for stuff other than
86 # 0.98, and the second will fail for 0.98.0
87 EnsureSConsVersion(0, 98)
88 EnsureSConsVersion(0, 98, 1)
89except SystemExit, e:
90 print """
91For more details, see:
92 http://gem5.org/Dependencies
93"""
94 raise
95
96# We ensure the python version early because because python-config
97# requires python 2.5
98try:
99 EnsurePythonVersion(2, 5)
100except SystemExit, e:
101 print """
102You can use a non-default installation of the Python interpreter by
103rearranging your PATH so that scons finds the non-default 'python' and
104'python-config' first.
105
106For more details, see:
107 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation
108"""
109 raise
110
111# Global Python includes
112import itertools
113import os
114import re
115import subprocess
116import sys
117
118from os import mkdir, environ
119from os.path import abspath, basename, dirname, expanduser, normpath
120from os.path import exists, isdir, isfile
121from os.path import join as joinpath, split as splitpath
122
123# SCons includes
124import SCons
125import SCons.Node
126
127extra_python_paths = [
128 Dir('src/python').srcnode().abspath, # gem5 includes
129 Dir('ext/ply').srcnode().abspath, # ply is used by several files
130 ]
131
132sys.path[1:1] = extra_python_paths
133
134from m5.util import compareVersions, readCommand
135from m5.util.terminal import get_termcap
136
137help_texts = {
138 "options" : "",
139 "global_vars" : "",
140 "local_vars" : ""
141}
142
143Export("help_texts")
144
145
146# There's a bug in scons in that (1) by default, the help texts from
147# AddOption() are supposed to be displayed when you type 'scons -h'
148# and (2) you can override the help displayed by 'scons -h' using the
149# Help() function, but these two features are incompatible: once
150# you've overridden the help text using Help(), there's no way to get
151# at the help texts from AddOptions. See:
152# http://scons.tigris.org/issues/show_bug.cgi?id=2356
153# http://scons.tigris.org/issues/show_bug.cgi?id=2611
154# This hack lets us extract the help text from AddOptions and
155# re-inject it via Help(). Ideally someday this bug will be fixed and
156# we can just use AddOption directly.
157def AddLocalOption(*args, **kwargs):
158 col_width = 30
159
160 help = " " + ", ".join(args)
161 if "help" in kwargs:
162 length = len(help)
163 if length >= col_width:
164 help += "\n" + " " * col_width
165 else:
166 help += " " * (col_width - length)
167 help += kwargs["help"]
168 help_texts["options"] += help + "\n"
169
170 AddOption(*args, **kwargs)
171
172AddLocalOption('--colors', dest='use_colors', action='store_true',
173 help="Add color to abbreviated scons output")
174AddLocalOption('--no-colors', dest='use_colors', action='store_false',
175 help="Don't add color to abbreviated scons output")
176AddLocalOption('--default', dest='default', type='string', action='store',
177 help='Override which build_opts file to use for defaults')
178AddLocalOption('--ignore-style', dest='ignore_style', action='store_true',
179 help='Disable style checking hooks')
180AddLocalOption('--no-lto', dest='no_lto', action='store_true',
181 help='Disable Link-Time Optimization for fast')
182AddLocalOption('--update-ref', dest='update_ref', action='store_true',
183 help='Update test reference outputs')
184AddLocalOption('--verbose', dest='verbose', action='store_true',
185 help='Print full tool command lines')
186
187termcap = get_termcap(GetOption('use_colors'))
188
189########################################################################
190#
191# Set up the main build environment.
192#
193########################################################################
194
195# export TERM so that clang reports errors in color
196use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
197 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC',
198 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ])
199
200use_prefixes = [
201 "M5", # M5 configuration (e.g., path to kernels)
202 "DISTCC_", # distcc (distributed compiler wrapper) configuration
203 "CCACHE_", # ccache (caching compiler wrapper) configuration
204 "CCC_", # clang static analyzer configuration
205 ]
206
207use_env = {}
208for key,val in os.environ.iteritems():
209 if key in use_vars or \
210 any([key.startswith(prefix) for prefix in use_prefixes]):
211 use_env[key] = val
212
213main = Environment(ENV=use_env)
214main.Decider('MD5-timestamp')
215main.root = Dir(".") # The current directory (where this file lives).
216main.srcdir = Dir("src") # The source directory
217
218main_dict_keys = main.Dictionary().keys()
219
220# Check that we have a C/C++ compiler
221if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
222 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
223 Exit(1)
224
225# Check that swig is present
226if not 'SWIG' in main_dict_keys:
227 print "swig is not installed (package swig on Ubuntu and RedHat)"
228 Exit(1)
229
230# add useful python code PYTHONPATH so it can be used by subprocesses
231# as well
232main.AppendENVPath('PYTHONPATH', extra_python_paths)
233
234########################################################################
235#
236# Mercurial Stuff.
237#
238# If the gem5 directory is a mercurial repository, we should do some
239# extra things.
240#
241########################################################################
242
243hgdir = main.root.Dir(".hg")
244
245mercurial_style_message = """
246You're missing the gem5 style hook, which automatically checks your code
247against the gem5 style rules on hg commit and qrefresh commands. This
248script will now install the hook in your .hg/hgrc file.
249Press enter to continue, or ctrl-c to abort: """
250
251mercurial_style_hook = """
252# The following lines were automatically added by gem5/SConstruct
253# to provide the gem5 style-checking hooks
254[extensions]
255style = %s/util/style.py
256
257[hooks]
258pretxncommit.style = python:style.check_style
259pre-qrefresh.style = python:style.check_style
260# End of SConstruct additions
261
262""" % (main.root.abspath)
263
264mercurial_lib_not_found = """
265Mercurial libraries cannot be found, ignoring style hook. If
266you are a gem5 developer, please fix this and run the style
267hook. It is important.
268"""
269
270# Check for style hook and prompt for installation if it's not there.
271# Skip this if --ignore-style was specified, there's no .hg dir to
272# install a hook in, or there's no interactive terminal to prompt.
273if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
274 style_hook = True
275 try:
276 from mercurial import ui
277 ui = ui.ui()
278 ui.readconfig(hgdir.File('hgrc').abspath)
279 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
280 ui.config('hooks', 'pre-qrefresh.style', None)
281 except ImportError:
282 print mercurial_lib_not_found
283
284 if not style_hook:
285 print mercurial_style_message,
286 # continue unless user does ctrl-c/ctrl-d etc.
287 try:
288 raw_input()
289 except:
290 print "Input exception, exiting scons.\n"
291 sys.exit(1)
292 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
293 print "Adding style hook to", hgrc_path, "\n"
294 try:
295 hgrc = open(hgrc_path, 'a')
296 hgrc.write(mercurial_style_hook)
297 hgrc.close()
298 except:
299 print "Error updating", hgrc_path
300 sys.exit(1)
301
302
303###################################################
304#
305# Figure out which configurations to set up based on the path(s) of
306# the target(s).
307#
308###################################################
309
310# Find default configuration & binary.
311Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
312
313# helper function: find last occurrence of element in list
314def rfind(l, elt, offs = -1):
315 for i in range(len(l)+offs, 0, -1):
316 if l[i] == elt:
317 return i
318 raise ValueError, "element not found"
319
320# Take a list of paths (or SCons Nodes) and return a list with all
321# paths made absolute and ~-expanded. Paths will be interpreted
322# relative to the launch directory unless a different root is provided
323def makePathListAbsolute(path_list, root=GetLaunchDir()):
324 return [abspath(joinpath(root, expanduser(str(p))))
325 for p in path_list]
326
327# Each target must have 'build' in the interior of the path; the
328# directory below this will determine the build parameters. For
329# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
330# recognize that ALPHA_SE specifies the configuration because it
331# follow 'build' in the build path.
332
333# The funky assignment to "[:]" is needed to replace the list contents
334# in place rather than reassign the symbol to a new list, which
335# doesn't work (obviously!).
336BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
337
338# Generate a list of the unique build roots and configs that the
339# collected targets reference.
340variant_paths = []
341build_root = None
342for t in BUILD_TARGETS:
343 path_dirs = t.split('/')
344 try:
345 build_top = rfind(path_dirs, 'build', -2)
346 except:
347 print "Error: no non-leaf 'build' dir found on target path", t
348 Exit(1)
349 this_build_root = joinpath('/',*path_dirs[:build_top+1])
350 if not build_root:
351 build_root = this_build_root
352 else:
353 if this_build_root != build_root:
354 print "Error: build targets not under same build root\n"\
355 " %s\n %s" % (build_root, this_build_root)
356 Exit(1)
357 variant_path = joinpath('/',*path_dirs[:build_top+2])
358 if variant_path not in variant_paths:
359 variant_paths.append(variant_path)
360
361# Make sure build_root exists (might not if this is the first build there)
362if not isdir(build_root):
363 mkdir(build_root)
364main['BUILDROOT'] = build_root
365
366Export('main')
367
368main.SConsignFile(joinpath(build_root, "sconsign"))
369
370# Default duplicate option is to use hard links, but this messes up
371# when you use emacs to edit a file in the target dir, as emacs moves
372# file to file~ then copies to file, breaking the link. Symbolic
373# (soft) links work better.
374main.SetOption('duplicate', 'soft-copy')
375
376#
377# Set up global sticky variables... these are common to an entire build
378# tree (not specific to a particular build like ALPHA_SE)
379#
380
381global_vars_file = joinpath(build_root, 'variables.global')
382
383global_vars = Variables(global_vars_file, args=ARGUMENTS)
384
385global_vars.AddVariables(
386 ('CC', 'C compiler', environ.get('CC', main['CC'])),
387 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
388 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])),
389 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')),
390 ('BATCH', 'Use batch pool for build and tests', False),
391 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
392 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
393 ('EXTRAS', 'Add extra directories to the compilation', '')
394 )
395
396# Update main environment with values from ARGUMENTS & global_vars_file
397global_vars.Update(main)
398help_texts["global_vars"] += global_vars.GenerateHelpText(main)
399
400# Save sticky variable settings back to current variables file
401global_vars.Save(global_vars_file, main)
402
403# Parse EXTRAS variable to build list of all directories where we're
404# look for sources etc. This list is exported as extras_dir_list.
405base_dir = main.srcdir.abspath
406if main['EXTRAS']:
407 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
408else:
409 extras_dir_list = []
410
411Export('base_dir')
412Export('extras_dir_list')
413
414# the ext directory should be on the #includes path
415main.Append(CPPPATH=[Dir('ext')])
416
417def strip_build_path(path, env):
418 path = str(path)
419 variant_base = env['BUILDROOT'] + os.path.sep
420 if path.startswith(variant_base):
421 path = path[len(variant_base):]
422 elif path.startswith('build/'):
423 path = path[6:]
424 return path
425
426# Generate a string of the form:
427# common/path/prefix/src1, src2 -> tgt1, tgt2
428# to print while building.
429class Transform(object):
430 # all specific color settings should be here and nowhere else
431 tool_color = termcap.Normal
432 pfx_color = termcap.Yellow
433 srcs_color = termcap.Yellow + termcap.Bold
434 arrow_color = termcap.Blue + termcap.Bold
435 tgts_color = termcap.Yellow + termcap.Bold
436
437 def __init__(self, tool, max_sources=99):
438 self.format = self.tool_color + (" [%8s] " % tool) \
439 + self.pfx_color + "%s" \
440 + self.srcs_color + "%s" \
441 + self.arrow_color + " -> " \
442 + self.tgts_color + "%s" \
443 + termcap.Normal
444 self.max_sources = max_sources
445
446 def __call__(self, target, source, env, for_signature=None):
447 # truncate source list according to max_sources param
448 source = source[0:self.max_sources]
449 def strip(f):
450 return strip_build_path(str(f), env)
451 if len(source) > 0:
452 srcs = map(strip, source)
453 else:
454 srcs = ['']
455 tgts = map(strip, target)
456 # surprisingly, os.path.commonprefix is a dumb char-by-char string
457 # operation that has nothing to do with paths.
458 com_pfx = os.path.commonprefix(srcs + tgts)
459 com_pfx_len = len(com_pfx)
460 if com_pfx:
461 # do some cleanup and sanity checking on common prefix
462 if com_pfx[-1] == ".":
463 # prefix matches all but file extension: ok
464 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
465 com_pfx = com_pfx[0:-1]
466 elif com_pfx[-1] == "/":
467 # common prefix is directory path: OK
468 pass
469 else:
470 src0_len = len(srcs[0])
471 tgt0_len = len(tgts[0])
472 if src0_len == com_pfx_len:
473 # source is a substring of target, OK
474 pass
475 elif tgt0_len == com_pfx_len:
476 # target is a substring of source, need to back up to
477 # avoid empty string on RHS of arrow
478 sep_idx = com_pfx.rfind(".")
479 if sep_idx != -1:
480 com_pfx = com_pfx[0:sep_idx]
481 else:
482 com_pfx = ''
483 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
484 # still splitting at file extension: ok
485 pass
486 else:
487 # probably a fluke; ignore it
488 com_pfx = ''
489 # recalculate length in case com_pfx was modified
490 com_pfx_len = len(com_pfx)
491 def fmt(files):
492 f = map(lambda s: s[com_pfx_len:], files)
493 return ', '.join(f)
494 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
495
496Export('Transform')
497
498# enable the regression script to use the termcap
499main['TERMCAP'] = termcap
500
501if GetOption('verbose'):
502 def MakeAction(action, string, *args, **kwargs):
503 return Action(action, *args, **kwargs)
504else:
505 MakeAction = Action
506 main['CCCOMSTR'] = Transform("CC")
507 main['CXXCOMSTR'] = Transform("CXX")
508 main['ASCOMSTR'] = Transform("AS")
509 main['SWIGCOMSTR'] = Transform("SWIG")
510 main['ARCOMSTR'] = Transform("AR", 0)
511 main['LINKCOMSTR'] = Transform("LINK", 0)
512 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
513 main['M4COMSTR'] = Transform("M4")
514 main['SHCCCOMSTR'] = Transform("SHCC")
515 main['SHCXXCOMSTR'] = Transform("SHCXX")
516Export('MakeAction')
517
518# Initialize the Link-Time Optimization (LTO) flags
519main['LTO_CCFLAGS'] = []
520main['LTO_LDFLAGS'] = []
521
522# According to the readme, tcmalloc works best if the compiler doesn't
523# assume that we're using the builtin malloc and friends. These flags
524# are compiler-specific, so we need to set them after we detect which
525# compiler we're using.
526main['TCMALLOC_CCFLAGS'] = []
527
528CXX_version = readCommand([main['CXX'],'--version'], exception=False)
529CXX_V = readCommand([main['CXX'],'-V'], exception=False)
530
531main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
532main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
533if main['GCC'] + main['CLANG'] > 1:
534 print 'Error: How can we have two at the same time?'
535 Exit(1)
536
537# Set up default C++ compiler flags
538if main['GCC'] or main['CLANG']:
539 # As gcc and clang share many flags, do the common parts here
540 main.Append(CCFLAGS=['-pipe'])
541 main.Append(CCFLAGS=['-fno-strict-aliasing'])
542 # Enable -Wall and then disable the few warnings that we
543 # consistently violate
544 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
545 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
546 # actually use that name, so we stick with c++0x
547 main.Append(CXXFLAGS=['-std=c++0x'])
548 # Add selected sanity checks from -Wextra
549 main.Append(CXXFLAGS=['-Wmissing-field-initializers',
550 '-Woverloaded-virtual'])
551else:
552 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
553 print "Don't know what compiler options to use for your compiler."
554 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
555 print termcap.Yellow + ' version:' + termcap.Normal,
556 if not CXX_version:
557 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
558 termcap.Normal
559 else:
560 print CXX_version.replace('\n', '<nl>')
561 print " If you're trying to use a compiler other than GCC"
562 print " or clang, there appears to be something wrong with your"
563 print " environment."
564 print " "
565 print " If you are trying to use a compiler other than those listed"
566 print " above you will need to ease fix SConstruct and "
567 print " src/SConscript to support that compiler."
568 Exit(1)
569
570if main['GCC']:
| 1# -*- mode:python -*-
2
3# Copyright (c) 2013 ARM Limited
4# All rights reserved.
5#
6# The license below extends only to copyright in the software and shall
7# not be construed as granting a license to any other intellectual
8# property including but not limited to intellectual property relating
9# to a hardware implementation of the functionality of the software
10# licensed hereunder. You may use the software subject to the license
11# terms below provided that you ensure that this notice is replicated
12# unmodified and in its entirety in all distributions of the software,
13# modified or unmodified, in source code or in binary form.
14#
15# Copyright (c) 2011 Advanced Micro Devices, Inc.
16# Copyright (c) 2009 The Hewlett-Packard Development Company
17# Copyright (c) 2004-2005 The Regents of The University of Michigan
18# All rights reserved.
19#
20# Redistribution and use in source and binary forms, with or without
21# modification, are permitted provided that the following conditions are
22# met: redistributions of source code must retain the above copyright
23# notice, this list of conditions and the following disclaimer;
24# redistributions in binary form must reproduce the above copyright
25# notice, this list of conditions and the following disclaimer in the
26# documentation and/or other materials provided with the distribution;
27# neither the name of the copyright holders nor the names of its
28# contributors may be used to endorse or promote products derived from
29# this software without specific prior written permission.
30#
31# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42#
43# Authors: Steve Reinhardt
44# Nathan Binkert
45
46###################################################
47#
48# SCons top-level build description (SConstruct) file.
49#
50# While in this directory ('gem5'), just type 'scons' to build the default
51# configuration (see below), or type 'scons build/<CONFIG>/<binary>'
52# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for
53# the optimized full-system version).
54#
55# You can build gem5 in a different directory as long as there is a
56# 'build/<CONFIG>' somewhere along the target path. The build system
57# expects that all configs under the same build directory are being
58# built for the same host system.
59#
60# Examples:
61#
62# The following two commands are equivalent. The '-u' option tells
63# scons to search up the directory tree for this SConstruct file.
64# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug
65# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug
66#
67# The following two commands are equivalent and demonstrate building
68# in a directory outside of the source tree. The '-C' option tells
69# scons to chdir to the specified directory to find this SConstruct
70# file.
71# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug
72# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug
73#
74# You can use 'scons -H' to print scons options. If you're in this
75# 'gem5' directory (or use -u or -C to tell scons where to find this
76# file), you can use 'scons -h' to print all the gem5-specific build
77# options as well.
78#
79###################################################
80
81# Check for recent-enough Python and SCons versions.
82try:
83 # Really old versions of scons only take two options for the
84 # function, so check once without the revision and once with the
85 # revision, the first instance will fail for stuff other than
86 # 0.98, and the second will fail for 0.98.0
87 EnsureSConsVersion(0, 98)
88 EnsureSConsVersion(0, 98, 1)
89except SystemExit, e:
90 print """
91For more details, see:
92 http://gem5.org/Dependencies
93"""
94 raise
95
96# We ensure the python version early because because python-config
97# requires python 2.5
98try:
99 EnsurePythonVersion(2, 5)
100except SystemExit, e:
101 print """
102You can use a non-default installation of the Python interpreter by
103rearranging your PATH so that scons finds the non-default 'python' and
104'python-config' first.
105
106For more details, see:
107 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation
108"""
109 raise
110
111# Global Python includes
112import itertools
113import os
114import re
115import subprocess
116import sys
117
118from os import mkdir, environ
119from os.path import abspath, basename, dirname, expanduser, normpath
120from os.path import exists, isdir, isfile
121from os.path import join as joinpath, split as splitpath
122
123# SCons includes
124import SCons
125import SCons.Node
126
127extra_python_paths = [
128 Dir('src/python').srcnode().abspath, # gem5 includes
129 Dir('ext/ply').srcnode().abspath, # ply is used by several files
130 ]
131
132sys.path[1:1] = extra_python_paths
133
134from m5.util import compareVersions, readCommand
135from m5.util.terminal import get_termcap
136
137help_texts = {
138 "options" : "",
139 "global_vars" : "",
140 "local_vars" : ""
141}
142
143Export("help_texts")
144
145
146# There's a bug in scons in that (1) by default, the help texts from
147# AddOption() are supposed to be displayed when you type 'scons -h'
148# and (2) you can override the help displayed by 'scons -h' using the
149# Help() function, but these two features are incompatible: once
150# you've overridden the help text using Help(), there's no way to get
151# at the help texts from AddOptions. See:
152# http://scons.tigris.org/issues/show_bug.cgi?id=2356
153# http://scons.tigris.org/issues/show_bug.cgi?id=2611
154# This hack lets us extract the help text from AddOptions and
155# re-inject it via Help(). Ideally someday this bug will be fixed and
156# we can just use AddOption directly.
157def AddLocalOption(*args, **kwargs):
158 col_width = 30
159
160 help = " " + ", ".join(args)
161 if "help" in kwargs:
162 length = len(help)
163 if length >= col_width:
164 help += "\n" + " " * col_width
165 else:
166 help += " " * (col_width - length)
167 help += kwargs["help"]
168 help_texts["options"] += help + "\n"
169
170 AddOption(*args, **kwargs)
171
172AddLocalOption('--colors', dest='use_colors', action='store_true',
173 help="Add color to abbreviated scons output")
174AddLocalOption('--no-colors', dest='use_colors', action='store_false',
175 help="Don't add color to abbreviated scons output")
176AddLocalOption('--default', dest='default', type='string', action='store',
177 help='Override which build_opts file to use for defaults')
178AddLocalOption('--ignore-style', dest='ignore_style', action='store_true',
179 help='Disable style checking hooks')
180AddLocalOption('--no-lto', dest='no_lto', action='store_true',
181 help='Disable Link-Time Optimization for fast')
182AddLocalOption('--update-ref', dest='update_ref', action='store_true',
183 help='Update test reference outputs')
184AddLocalOption('--verbose', dest='verbose', action='store_true',
185 help='Print full tool command lines')
186
187termcap = get_termcap(GetOption('use_colors'))
188
189########################################################################
190#
191# Set up the main build environment.
192#
193########################################################################
194
195# export TERM so that clang reports errors in color
196use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
197 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC',
198 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ])
199
200use_prefixes = [
201 "M5", # M5 configuration (e.g., path to kernels)
202 "DISTCC_", # distcc (distributed compiler wrapper) configuration
203 "CCACHE_", # ccache (caching compiler wrapper) configuration
204 "CCC_", # clang static analyzer configuration
205 ]
206
207use_env = {}
208for key,val in os.environ.iteritems():
209 if key in use_vars or \
210 any([key.startswith(prefix) for prefix in use_prefixes]):
211 use_env[key] = val
212
213main = Environment(ENV=use_env)
214main.Decider('MD5-timestamp')
215main.root = Dir(".") # The current directory (where this file lives).
216main.srcdir = Dir("src") # The source directory
217
218main_dict_keys = main.Dictionary().keys()
219
220# Check that we have a C/C++ compiler
221if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
222 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
223 Exit(1)
224
225# Check that swig is present
226if not 'SWIG' in main_dict_keys:
227 print "swig is not installed (package swig on Ubuntu and RedHat)"
228 Exit(1)
229
230# add useful python code PYTHONPATH so it can be used by subprocesses
231# as well
232main.AppendENVPath('PYTHONPATH', extra_python_paths)
233
234########################################################################
235#
236# Mercurial Stuff.
237#
238# If the gem5 directory is a mercurial repository, we should do some
239# extra things.
240#
241########################################################################
242
243hgdir = main.root.Dir(".hg")
244
245mercurial_style_message = """
246You're missing the gem5 style hook, which automatically checks your code
247against the gem5 style rules on hg commit and qrefresh commands. This
248script will now install the hook in your .hg/hgrc file.
249Press enter to continue, or ctrl-c to abort: """
250
251mercurial_style_hook = """
252# The following lines were automatically added by gem5/SConstruct
253# to provide the gem5 style-checking hooks
254[extensions]
255style = %s/util/style.py
256
257[hooks]
258pretxncommit.style = python:style.check_style
259pre-qrefresh.style = python:style.check_style
260# End of SConstruct additions
261
262""" % (main.root.abspath)
263
264mercurial_lib_not_found = """
265Mercurial libraries cannot be found, ignoring style hook. If
266you are a gem5 developer, please fix this and run the style
267hook. It is important.
268"""
269
270# Check for style hook and prompt for installation if it's not there.
271# Skip this if --ignore-style was specified, there's no .hg dir to
272# install a hook in, or there's no interactive terminal to prompt.
273if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
274 style_hook = True
275 try:
276 from mercurial import ui
277 ui = ui.ui()
278 ui.readconfig(hgdir.File('hgrc').abspath)
279 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
280 ui.config('hooks', 'pre-qrefresh.style', None)
281 except ImportError:
282 print mercurial_lib_not_found
283
284 if not style_hook:
285 print mercurial_style_message,
286 # continue unless user does ctrl-c/ctrl-d etc.
287 try:
288 raw_input()
289 except:
290 print "Input exception, exiting scons.\n"
291 sys.exit(1)
292 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
293 print "Adding style hook to", hgrc_path, "\n"
294 try:
295 hgrc = open(hgrc_path, 'a')
296 hgrc.write(mercurial_style_hook)
297 hgrc.close()
298 except:
299 print "Error updating", hgrc_path
300 sys.exit(1)
301
302
303###################################################
304#
305# Figure out which configurations to set up based on the path(s) of
306# the target(s).
307#
308###################################################
309
310# Find default configuration & binary.
311Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
312
313# helper function: find last occurrence of element in list
314def rfind(l, elt, offs = -1):
315 for i in range(len(l)+offs, 0, -1):
316 if l[i] == elt:
317 return i
318 raise ValueError, "element not found"
319
320# Take a list of paths (or SCons Nodes) and return a list with all
321# paths made absolute and ~-expanded. Paths will be interpreted
322# relative to the launch directory unless a different root is provided
323def makePathListAbsolute(path_list, root=GetLaunchDir()):
324 return [abspath(joinpath(root, expanduser(str(p))))
325 for p in path_list]
326
327# Each target must have 'build' in the interior of the path; the
328# directory below this will determine the build parameters. For
329# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
330# recognize that ALPHA_SE specifies the configuration because it
331# follow 'build' in the build path.
332
333# The funky assignment to "[:]" is needed to replace the list contents
334# in place rather than reassign the symbol to a new list, which
335# doesn't work (obviously!).
336BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
337
338# Generate a list of the unique build roots and configs that the
339# collected targets reference.
340variant_paths = []
341build_root = None
342for t in BUILD_TARGETS:
343 path_dirs = t.split('/')
344 try:
345 build_top = rfind(path_dirs, 'build', -2)
346 except:
347 print "Error: no non-leaf 'build' dir found on target path", t
348 Exit(1)
349 this_build_root = joinpath('/',*path_dirs[:build_top+1])
350 if not build_root:
351 build_root = this_build_root
352 else:
353 if this_build_root != build_root:
354 print "Error: build targets not under same build root\n"\
355 " %s\n %s" % (build_root, this_build_root)
356 Exit(1)
357 variant_path = joinpath('/',*path_dirs[:build_top+2])
358 if variant_path not in variant_paths:
359 variant_paths.append(variant_path)
360
361# Make sure build_root exists (might not if this is the first build there)
362if not isdir(build_root):
363 mkdir(build_root)
364main['BUILDROOT'] = build_root
365
366Export('main')
367
368main.SConsignFile(joinpath(build_root, "sconsign"))
369
370# Default duplicate option is to use hard links, but this messes up
371# when you use emacs to edit a file in the target dir, as emacs moves
372# file to file~ then copies to file, breaking the link. Symbolic
373# (soft) links work better.
374main.SetOption('duplicate', 'soft-copy')
375
376#
377# Set up global sticky variables... these are common to an entire build
378# tree (not specific to a particular build like ALPHA_SE)
379#
380
381global_vars_file = joinpath(build_root, 'variables.global')
382
383global_vars = Variables(global_vars_file, args=ARGUMENTS)
384
385global_vars.AddVariables(
386 ('CC', 'C compiler', environ.get('CC', main['CC'])),
387 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
388 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])),
389 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')),
390 ('BATCH', 'Use batch pool for build and tests', False),
391 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
392 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
393 ('EXTRAS', 'Add extra directories to the compilation', '')
394 )
395
396# Update main environment with values from ARGUMENTS & global_vars_file
397global_vars.Update(main)
398help_texts["global_vars"] += global_vars.GenerateHelpText(main)
399
400# Save sticky variable settings back to current variables file
401global_vars.Save(global_vars_file, main)
402
403# Parse EXTRAS variable to build list of all directories where we're
404# look for sources etc. This list is exported as extras_dir_list.
405base_dir = main.srcdir.abspath
406if main['EXTRAS']:
407 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
408else:
409 extras_dir_list = []
410
411Export('base_dir')
412Export('extras_dir_list')
413
414# the ext directory should be on the #includes path
415main.Append(CPPPATH=[Dir('ext')])
416
417def strip_build_path(path, env):
418 path = str(path)
419 variant_base = env['BUILDROOT'] + os.path.sep
420 if path.startswith(variant_base):
421 path = path[len(variant_base):]
422 elif path.startswith('build/'):
423 path = path[6:]
424 return path
425
426# Generate a string of the form:
427# common/path/prefix/src1, src2 -> tgt1, tgt2
428# to print while building.
429class Transform(object):
430 # all specific color settings should be here and nowhere else
431 tool_color = termcap.Normal
432 pfx_color = termcap.Yellow
433 srcs_color = termcap.Yellow + termcap.Bold
434 arrow_color = termcap.Blue + termcap.Bold
435 tgts_color = termcap.Yellow + termcap.Bold
436
437 def __init__(self, tool, max_sources=99):
438 self.format = self.tool_color + (" [%8s] " % tool) \
439 + self.pfx_color + "%s" \
440 + self.srcs_color + "%s" \
441 + self.arrow_color + " -> " \
442 + self.tgts_color + "%s" \
443 + termcap.Normal
444 self.max_sources = max_sources
445
446 def __call__(self, target, source, env, for_signature=None):
447 # truncate source list according to max_sources param
448 source = source[0:self.max_sources]
449 def strip(f):
450 return strip_build_path(str(f), env)
451 if len(source) > 0:
452 srcs = map(strip, source)
453 else:
454 srcs = ['']
455 tgts = map(strip, target)
456 # surprisingly, os.path.commonprefix is a dumb char-by-char string
457 # operation that has nothing to do with paths.
458 com_pfx = os.path.commonprefix(srcs + tgts)
459 com_pfx_len = len(com_pfx)
460 if com_pfx:
461 # do some cleanup and sanity checking on common prefix
462 if com_pfx[-1] == ".":
463 # prefix matches all but file extension: ok
464 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
465 com_pfx = com_pfx[0:-1]
466 elif com_pfx[-1] == "/":
467 # common prefix is directory path: OK
468 pass
469 else:
470 src0_len = len(srcs[0])
471 tgt0_len = len(tgts[0])
472 if src0_len == com_pfx_len:
473 # source is a substring of target, OK
474 pass
475 elif tgt0_len == com_pfx_len:
476 # target is a substring of source, need to back up to
477 # avoid empty string on RHS of arrow
478 sep_idx = com_pfx.rfind(".")
479 if sep_idx != -1:
480 com_pfx = com_pfx[0:sep_idx]
481 else:
482 com_pfx = ''
483 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
484 # still splitting at file extension: ok
485 pass
486 else:
487 # probably a fluke; ignore it
488 com_pfx = ''
489 # recalculate length in case com_pfx was modified
490 com_pfx_len = len(com_pfx)
491 def fmt(files):
492 f = map(lambda s: s[com_pfx_len:], files)
493 return ', '.join(f)
494 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
495
496Export('Transform')
497
498# enable the regression script to use the termcap
499main['TERMCAP'] = termcap
500
501if GetOption('verbose'):
502 def MakeAction(action, string, *args, **kwargs):
503 return Action(action, *args, **kwargs)
504else:
505 MakeAction = Action
506 main['CCCOMSTR'] = Transform("CC")
507 main['CXXCOMSTR'] = Transform("CXX")
508 main['ASCOMSTR'] = Transform("AS")
509 main['SWIGCOMSTR'] = Transform("SWIG")
510 main['ARCOMSTR'] = Transform("AR", 0)
511 main['LINKCOMSTR'] = Transform("LINK", 0)
512 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
513 main['M4COMSTR'] = Transform("M4")
514 main['SHCCCOMSTR'] = Transform("SHCC")
515 main['SHCXXCOMSTR'] = Transform("SHCXX")
516Export('MakeAction')
517
518# Initialize the Link-Time Optimization (LTO) flags
519main['LTO_CCFLAGS'] = []
520main['LTO_LDFLAGS'] = []
521
522# According to the readme, tcmalloc works best if the compiler doesn't
523# assume that we're using the builtin malloc and friends. These flags
524# are compiler-specific, so we need to set them after we detect which
525# compiler we're using.
526main['TCMALLOC_CCFLAGS'] = []
527
528CXX_version = readCommand([main['CXX'],'--version'], exception=False)
529CXX_V = readCommand([main['CXX'],'-V'], exception=False)
530
531main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
532main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
533if main['GCC'] + main['CLANG'] > 1:
534 print 'Error: How can we have two at the same time?'
535 Exit(1)
536
537# Set up default C++ compiler flags
538if main['GCC'] or main['CLANG']:
539 # As gcc and clang share many flags, do the common parts here
540 main.Append(CCFLAGS=['-pipe'])
541 main.Append(CCFLAGS=['-fno-strict-aliasing'])
542 # Enable -Wall and then disable the few warnings that we
543 # consistently violate
544 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
545 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
546 # actually use that name, so we stick with c++0x
547 main.Append(CXXFLAGS=['-std=c++0x'])
548 # Add selected sanity checks from -Wextra
549 main.Append(CXXFLAGS=['-Wmissing-field-initializers',
550 '-Woverloaded-virtual'])
551else:
552 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
553 print "Don't know what compiler options to use for your compiler."
554 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
555 print termcap.Yellow + ' version:' + termcap.Normal,
556 if not CXX_version:
557 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
558 termcap.Normal
559 else:
560 print CXX_version.replace('\n', '<nl>')
561 print " If you're trying to use a compiler other than GCC"
562 print " or clang, there appears to be something wrong with your"
563 print " environment."
564 print " "
565 print " If you are trying to use a compiler other than those listed"
566 print " above you will need to ease fix SConstruct and "
567 print " src/SConscript to support that compiler."
568 Exit(1)
569
570if main['GCC']:
|
617 print ' Installed version:', clang_version
618 Exit(1)
619 else:
620 print 'Error: Unable to determine clang version.'
621 Exit(1)
622
623 # clang has a few additional warnings that we disable,
624 # tautological comparisons are allowed due to unsigned integers
625 # being compared to constants that happen to be 0, and extraneous
626 # parantheses are allowed due to Ruby's printing of the AST,
627 # finally self assignments are allowed as the generated CPU code
628 # is relying on this
629 main.Append(CCFLAGS=['-Wno-tautological-compare',
630 '-Wno-parentheses',
631 '-Wno-self-assign'])
632
633 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
634
635 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
636 # opposed to libstdc++, as the later is dated.
637 if sys.platform == "darwin":
638 main.Append(CXXFLAGS=['-stdlib=libc++'])
639 main.Append(LIBS=['c++'])
640
641else:
642 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
643 print "Don't know what compiler options to use for your compiler."
644 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
645 print termcap.Yellow + ' version:' + termcap.Normal,
646 if not CXX_version:
647 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
648 termcap.Normal
649 else:
650 print CXX_version.replace('\n', '<nl>')
651 print " If you're trying to use a compiler other than GCC"
652 print " or clang, there appears to be something wrong with your"
653 print " environment."
654 print " "
655 print " If you are trying to use a compiler other than those listed"
656 print " above you will need to ease fix SConstruct and "
657 print " src/SConscript to support that compiler."
658 Exit(1)
659
660# Set up common yacc/bison flags (needed for Ruby)
661main['YACCFLAGS'] = '-d'
662main['YACCHXXFILESUFFIX'] = '.hh'
663
664# Do this after we save setting back, or else we'll tack on an
665# extra 'qdo' every time we run scons.
666if main['BATCH']:
667 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
668 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
669 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
670 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
671 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
672
673if sys.platform == 'cygwin':
674 # cygwin has some header file issues...
675 main.Append(CCFLAGS=["-Wno-uninitialized"])
676
677# Check for the protobuf compiler
678protoc_version = readCommand([main['PROTOC'], '--version'],
679 exception='').split()
680
681# First two words should be "libprotoc x.y.z"
682if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
683 print termcap.Yellow + termcap.Bold + \
684 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
685 ' Please install protobuf-compiler for tracing support.' + \
686 termcap.Normal
687 main['PROTOC'] = False
688else:
689 # Based on the availability of the compress stream wrappers,
690 # require 2.1.0
691 min_protoc_version = '2.1.0'
692 if compareVersions(protoc_version[1], min_protoc_version) < 0:
693 print termcap.Yellow + termcap.Bold + \
694 'Warning: protoc version', min_protoc_version, \
695 'or newer required.\n' + \
696 ' Installed version:', protoc_version[1], \
697 termcap.Normal
698 main['PROTOC'] = False
699 else:
700 # Attempt to determine the appropriate include path and
701 # library path using pkg-config, that means we also need to
702 # check for pkg-config. Note that it is possible to use
703 # protobuf without the involvement of pkg-config. Later on we
704 # check go a library config check and at that point the test
705 # will fail if libprotobuf cannot be found.
706 if readCommand(['pkg-config', '--version'], exception=''):
707 try:
708 # Attempt to establish what linking flags to add for protobuf
709 # using pkg-config
710 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
711 except:
712 print termcap.Yellow + termcap.Bold + \
713 'Warning: pkg-config could not get protobuf flags.' + \
714 termcap.Normal
715
716# Check for SWIG
717if not main.has_key('SWIG'):
718 print 'Error: SWIG utility not found.'
719 print ' Please install (see http://www.swig.org) and retry.'
720 Exit(1)
721
722# Check for appropriate SWIG version
723swig_version = readCommand([main['SWIG'], '-version'], exception='').split()
724# First 3 words should be "SWIG Version x.y.z"
725if len(swig_version) < 3 or \
726 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
727 print 'Error determining SWIG version.'
728 Exit(1)
729
730min_swig_version = '2.0.4'
731if compareVersions(swig_version[2], min_swig_version) < 0:
732 print 'Error: SWIG version', min_swig_version, 'or newer required.'
733 print ' Installed version:', swig_version[2]
734 Exit(1)
735
736# Set up SWIG flags & scanner
737swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
738main.Append(SWIGFLAGS=swig_flags)
739
740# filter out all existing swig scanners, they mess up the dependency
741# stuff for some reason
742scanners = []
743for scanner in main['SCANNERS']:
744 skeys = scanner.skeys
745 if skeys == '.i':
746 continue
747
748 if isinstance(skeys, (list, tuple)) and '.i' in skeys:
749 continue
750
751 scanners.append(scanner)
752
753# add the new swig scanner that we like better
754from SCons.Scanner import ClassicCPP as CPPScanner
755swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
756scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
757
758# replace the scanners list that has what we want
759main['SCANNERS'] = scanners
760
761# Add a custom Check function to the Configure context so that we can
762# figure out if the compiler adds leading underscores to global
763# variables. This is needed for the autogenerated asm files that we
764# use for embedding the python code.
765def CheckLeading(context):
766 context.Message("Checking for leading underscore in global variables...")
767 # 1) Define a global variable called x from asm so the C compiler
768 # won't change the symbol at all.
769 # 2) Declare that variable.
770 # 3) Use the variable
771 #
772 # If the compiler prepends an underscore, this will successfully
773 # link because the external symbol 'x' will be called '_x' which
774 # was defined by the asm statement. If the compiler does not
775 # prepend an underscore, this will not successfully link because
776 # '_x' will have been defined by assembly, while the C portion of
777 # the code will be trying to use 'x'
778 ret = context.TryLink('''
779 asm(".globl _x; _x: .byte 0");
780 extern int x;
781 int main() { return x; }
782 ''', extension=".c")
783 context.env.Append(LEADING_UNDERSCORE=ret)
784 context.Result(ret)
785 return ret
786
787# Add a custom Check function to test for structure members.
788def CheckMember(context, include, decl, member, include_quotes="<>"):
789 context.Message("Checking for member %s in %s..." %
790 (member, decl))
791 text = """
792#include %(header)s
793int main(){
794 %(decl)s test;
795 (void)test.%(member)s;
796 return 0;
797};
798""" % { "header" : include_quotes[0] + include + include_quotes[1],
799 "decl" : decl,
800 "member" : member,
801 }
802
803 ret = context.TryCompile(text, extension=".cc")
804 context.Result(ret)
805 return ret
806
807# Platform-specific configuration. Note again that we assume that all
808# builds under a given build root run on the same host platform.
809conf = Configure(main,
810 conf_dir = joinpath(build_root, '.scons_config'),
811 log_file = joinpath(build_root, 'scons_config.log'),
812 custom_tests = {
813 'CheckLeading' : CheckLeading,
814 'CheckMember' : CheckMember,
815 })
816
817# Check for leading underscores. Don't really need to worry either
818# way so don't need to check the return code.
819conf.CheckLeading()
820
821# Check if we should compile a 64 bit binary on Mac OS X/Darwin
822try:
823 import platform
824 uname = platform.uname()
825 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
826 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
827 main.Append(CCFLAGS=['-arch', 'x86_64'])
828 main.Append(CFLAGS=['-arch', 'x86_64'])
829 main.Append(LINKFLAGS=['-arch', 'x86_64'])
830 main.Append(ASFLAGS=['-arch', 'x86_64'])
831except:
832 pass
833
834# Recent versions of scons substitute a "Null" object for Configure()
835# when configuration isn't necessary, e.g., if the "--help" option is
836# present. Unfortuantely this Null object always returns false,
837# breaking all our configuration checks. We replace it with our own
838# more optimistic null object that returns True instead.
839if not conf:
840 def NullCheck(*args, **kwargs):
841 return True
842
843 class NullConf:
844 def __init__(self, env):
845 self.env = env
846 def Finish(self):
847 return self.env
848 def __getattr__(self, mname):
849 return NullCheck
850
851 conf = NullConf(main)
852
853# Cache build files in the supplied directory.
854if main['M5_BUILD_CACHE']:
855 print 'Using build cache located at', main['M5_BUILD_CACHE']
856 CacheDir(main['M5_BUILD_CACHE'])
857
858# Find Python include and library directories for embedding the
859# interpreter. We rely on python-config to resolve the appropriate
860# includes and linker flags. ParseConfig does not seem to understand
861# the more exotic linker flags such as -Xlinker and -export-dynamic so
862# we add them explicitly below. If you want to link in an alternate
863# version of python, see above for instructions on how to invoke
864# scons with the appropriate PATH set.
865#
866# First we check if python2-config exists, else we use python-config
867python_config = readCommand(['which', 'python2-config'], exception='').strip()
868if not os.path.exists(python_config):
869 python_config = readCommand(['which', 'python-config'],
870 exception='').strip()
871py_includes = readCommand([python_config, '--includes'],
872 exception='').split()
873# Strip the -I from the include folders before adding them to the
874# CPPPATH
875main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes))
876
877# Read the linker flags and split them into libraries and other link
878# flags. The libraries are added later through the call the CheckLib.
879py_ld_flags = readCommand([python_config, '--ldflags'], exception='').split()
880py_libs = []
881for lib in py_ld_flags:
882 if not lib.startswith('-l'):
883 main.Append(LINKFLAGS=[lib])
884 else:
885 lib = lib[2:]
886 if lib not in py_libs:
887 py_libs.append(lib)
888
889# verify that this stuff works
890if not conf.CheckHeader('Python.h', '<>'):
891 print "Error: can't find Python.h header in", py_includes
892 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
893 Exit(1)
894
895for lib in py_libs:
896 if not conf.CheckLib(lib):
897 print "Error: can't find library %s required by python" % lib
898 Exit(1)
899
900# On Solaris you need to use libsocket for socket ops
901if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
902 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
903 print "Can't find library with socket calls (e.g. accept())"
904 Exit(1)
905
906# Check for zlib. If the check passes, libz will be automatically
907# added to the LIBS environment variable.
908if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
909 print 'Error: did not find needed zlib compression library '\
910 'and/or zlib.h header file.'
911 print ' Please install zlib and try again.'
912 Exit(1)
913
914# If we have the protobuf compiler, also make sure we have the
915# development libraries. If the check passes, libprotobuf will be
916# automatically added to the LIBS environment variable. After
917# this, we can use the HAVE_PROTOBUF flag to determine if we have
918# got both protoc and libprotobuf available.
919main['HAVE_PROTOBUF'] = main['PROTOC'] and \
920 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
921 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
922
923# If we have the compiler but not the library, print another warning.
924if main['PROTOC'] and not main['HAVE_PROTOBUF']:
925 print termcap.Yellow + termcap.Bold + \
926 'Warning: did not find protocol buffer library and/or headers.\n' + \
927 ' Please install libprotobuf-dev for tracing support.' + \
928 termcap.Normal
929
930# Check for librt.
931have_posix_clock = \
932 conf.CheckLibWithHeader(None, 'time.h', 'C',
933 'clock_nanosleep(0,0,NULL,NULL);') or \
934 conf.CheckLibWithHeader('rt', 'time.h', 'C',
935 'clock_nanosleep(0,0,NULL,NULL);')
936
937have_posix_timers = \
938 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
939 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
940
941if conf.CheckLib('tcmalloc'):
942 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
943elif conf.CheckLib('tcmalloc_minimal'):
944 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
945else:
946 print termcap.Yellow + termcap.Bold + \
947 "You can get a 12% performance improvement by installing tcmalloc "\
948 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \
949 termcap.Normal
950
951if not have_posix_clock:
952 print "Can't find library for POSIX clocks."
953
954# Check for <fenv.h> (C99 FP environment control)
955have_fenv = conf.CheckHeader('fenv.h', '<>')
956if not have_fenv:
957 print "Warning: Header file <fenv.h> not found."
958 print " This host has no IEEE FP rounding mode control."
959
960# Check if we should enable KVM-based hardware virtualization. The API
961# we rely on exists since version 2.6.36 of the kernel, but somehow
962# the KVM_API_VERSION does not reflect the change. We test for one of
963# the types as a fall back.
964have_kvm = conf.CheckHeader('linux/kvm.h', '<>') and \
965 conf.CheckTypeSize('struct kvm_xsave', '#include <linux/kvm.h>') != 0
966if not have_kvm:
967 print "Info: Compatible header file <linux/kvm.h> not found, " \
968 "disabling KVM support."
969
970# Check if the requested target ISA is compatible with the host
971def is_isa_kvm_compatible(isa):
972 isa_comp_table = {
973 "arm" : ( "armv7l" ),
974 "x86" : ( "x86_64" ),
975 }
976 try:
977 import platform
978 host_isa = platform.machine()
979 except:
980 print "Warning: Failed to determine host ISA."
981 return False
982
983 return host_isa in isa_comp_table.get(isa, [])
984
985
986# Check if the exclude_host attribute is available. We want this to
987# get accurate instruction counts in KVM.
988main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember(
989 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
990
991
992######################################################################
993#
994# Finish the configuration
995#
996main = conf.Finish()
997
998######################################################################
999#
1000# Collect all non-global variables
1001#
1002
1003# Define the universe of supported ISAs
1004all_isa_list = [ ]
1005Export('all_isa_list')
1006
1007class CpuModel(object):
1008 '''The CpuModel class encapsulates everything the ISA parser needs to
1009 know about a particular CPU model.'''
1010
1011 # Dict of available CPU model objects. Accessible as CpuModel.dict.
1012 dict = {}
1013 list = []
1014 defaults = []
1015
1016 # Constructor. Automatically adds models to CpuModel.dict.
1017 def __init__(self, name, filename, includes, strings, default=False):
1018 self.name = name # name of model
1019 self.filename = filename # filename for output exec code
1020 self.includes = includes # include files needed in exec file
1021 # The 'strings' dict holds all the per-CPU symbols we can
1022 # substitute into templates etc.
1023 self.strings = strings
1024
1025 # This cpu is enabled by default
1026 self.default = default
1027
1028 # Add self to dict
1029 if name in CpuModel.dict:
1030 raise AttributeError, "CpuModel '%s' already registered" % name
1031 CpuModel.dict[name] = self
1032 CpuModel.list.append(name)
1033
1034Export('CpuModel')
1035
1036# Sticky variables get saved in the variables file so they persist from
1037# one invocation to the next (unless overridden, in which case the new
1038# value becomes sticky).
1039sticky_vars = Variables(args=ARGUMENTS)
1040Export('sticky_vars')
1041
1042# Sticky variables that should be exported
1043export_vars = []
1044Export('export_vars')
1045
1046# For Ruby
1047all_protocols = []
1048Export('all_protocols')
1049protocol_dirs = []
1050Export('protocol_dirs')
1051slicc_includes = []
1052Export('slicc_includes')
1053
1054# Walk the tree and execute all SConsopts scripts that wil add to the
1055# above variables
1056if GetOption('verbose'):
1057 print "Reading SConsopts"
1058for bdir in [ base_dir ] + extras_dir_list:
1059 if not isdir(bdir):
1060 print "Error: directory '%s' does not exist" % bdir
1061 Exit(1)
1062 for root, dirs, files in os.walk(bdir):
1063 if 'SConsopts' in files:
1064 if GetOption('verbose'):
1065 print "Reading", joinpath(root, 'SConsopts')
1066 SConscript(joinpath(root, 'SConsopts'))
1067
1068all_isa_list.sort()
1069
1070sticky_vars.AddVariables(
1071 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
1072 ListVariable('CPU_MODELS', 'CPU models',
1073 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
1074 sorted(CpuModel.list)),
1075 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1076 False),
1077 BoolVariable('SS_COMPATIBLE_FP',
1078 'Make floating-point results compatible with SimpleScalar',
1079 False),
1080 BoolVariable('USE_SSE2',
1081 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1082 False),
1083 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
1084 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
1085 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1086 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
1087 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1088 all_protocols),
1089 )
1090
1091# These variables get exported to #defines in config/*.hh (see src/SConscript).
1092export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1093 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF',
1094 'HAVE_PERF_ATTR_EXCLUDE_HOST']
1095
1096###################################################
1097#
1098# Define a SCons builder for configuration flag headers.
1099#
1100###################################################
1101
1102# This function generates a config header file that #defines the
1103# variable symbol to the current variable setting (0 or 1). The source
1104# operands are the name of the variable and a Value node containing the
1105# value of the variable.
1106def build_config_file(target, source, env):
1107 (variable, value) = [s.get_contents() for s in source]
1108 f = file(str(target[0]), 'w')
1109 print >> f, '#define', variable, value
1110 f.close()
1111 return None
1112
1113# Combine the two functions into a scons Action object.
1114config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))
1115
1116# The emitter munges the source & target node lists to reflect what
1117# we're really doing.
1118def config_emitter(target, source, env):
1119 # extract variable name from Builder arg
1120 variable = str(target[0])
1121 # True target is config header file
1122 target = joinpath('config', variable.lower() + '.hh')
1123 val = env[variable]
1124 if isinstance(val, bool):
1125 # Force value to 0/1
1126 val = int(val)
1127 elif isinstance(val, str):
1128 val = '"' + val + '"'
1129
1130 # Sources are variable name & value (packaged in SCons Value nodes)
1131 return ([target], [Value(variable), Value(val)])
1132
1133config_builder = Builder(emitter = config_emitter, action = config_action)
1134
1135main.Append(BUILDERS = { 'ConfigFile' : config_builder })
1136
1137# libelf build is shared across all configs in the build root.
1138main.SConscript('ext/libelf/SConscript',
1139 variant_dir = joinpath(build_root, 'libelf'))
1140
1141# gzstream build is shared across all configs in the build root.
1142main.SConscript('ext/gzstream/SConscript',
1143 variant_dir = joinpath(build_root, 'gzstream'))
1144
1145# libfdt build is shared across all configs in the build root.
1146main.SConscript('ext/libfdt/SConscript',
1147 variant_dir = joinpath(build_root, 'libfdt'))
1148
1149# fputils build is shared across all configs in the build root.
1150main.SConscript('ext/fputils/SConscript',
1151 variant_dir = joinpath(build_root, 'fputils'))
1152
1153# DRAMSim2 build is shared across all configs in the build root.
1154main.SConscript('ext/dramsim2/SConscript',
1155 variant_dir = joinpath(build_root, 'dramsim2'))
1156
1157###################################################
1158#
1159# This function is used to set up a directory with switching headers
1160#
1161###################################################
1162
1163main['ALL_ISA_LIST'] = all_isa_list
1164all_isa_deps = {}
1165def make_switching_dir(dname, switch_headers, env):
1166 # Generate the header. target[0] is the full path of the output
1167 # header to generate. 'source' is a dummy variable, since we get the
1168 # list of ISAs from env['ALL_ISA_LIST'].
1169 def gen_switch_hdr(target, source, env):
1170 fname = str(target[0])
1171 isa = env['TARGET_ISA'].lower()
1172 try:
1173 f = open(fname, 'w')
1174 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
1175 f.close()
1176 except IOError:
1177 print "Failed to create %s" % fname
1178 raise
1179
1180 # Build SCons Action object. 'varlist' specifies env vars that this
1181 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1182 # should get re-executed.
1183 switch_hdr_action = MakeAction(gen_switch_hdr,
1184 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
1185
1186 # Instantiate actions for each header
1187 for hdr in switch_headers:
1188 env.Command(hdr, [], switch_hdr_action)
1189
1190 isa_target = Dir('.').up().name.lower().replace('_', '-')
1191 env['PHONY_BASE'] = '#'+isa_target
1192 all_isa_deps[isa_target] = None
1193
1194Export('make_switching_dir')
1195
1196# all-isas -> all-deps -> all-environs -> all_targets
1197main.Alias('#all-isas', [])
1198main.Alias('#all-deps', '#all-isas')
1199
1200# Dummy target to ensure all environments are created before telling
1201# SCons what to actually make (the command line arguments). We attach
1202# them to the dependence graph after the environments are complete.
1203ORIG_BUILD_TARGETS = list(BUILD_TARGETS) # force a copy; gets closure to work.
1204def environsComplete(target, source, env):
1205 for t in ORIG_BUILD_TARGETS:
1206 main.Depends('#all-targets', t)
1207
1208# Each build/* switching_dir attaches its *-environs target to #all-environs.
1209main.Append(BUILDERS = {'CompleteEnvirons' :
1210 Builder(action=MakeAction(environsComplete, None))})
1211main.CompleteEnvirons('#all-environs', [])
1212
1213def doNothing(**ignored): pass
1214main.Append(BUILDERS = {'Dummy': Builder(action=MakeAction(doNothing, None))})
1215
1216# The final target to which all the original targets ultimately get attached.
1217main.Dummy('#all-targets', '#all-environs')
1218BUILD_TARGETS[:] = ['#all-targets']
1219
1220###################################################
1221#
1222# Define build environments for selected configurations.
1223#
1224###################################################
1225
1226for variant_path in variant_paths:
1227 if not GetOption('silent'):
1228 print "Building in", variant_path
1229
1230 # Make a copy of the build-root environment to use for this config.
1231 env = main.Clone()
1232 env['BUILDDIR'] = variant_path
1233
1234 # variant_dir is the tail component of build path, and is used to
1235 # determine the build parameters (e.g., 'ALPHA_SE')
1236 (build_root, variant_dir) = splitpath(variant_path)
1237
1238 # Set env variables according to the build directory config.
1239 sticky_vars.files = []
1240 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1241 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1242 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1243 current_vars_file = joinpath(build_root, 'variables', variant_dir)
1244 if isfile(current_vars_file):
1245 sticky_vars.files.append(current_vars_file)
1246 if not GetOption('silent'):
1247 print "Using saved variables file %s" % current_vars_file
1248 else:
1249 # Build dir-specific variables file doesn't exist.
1250
1251 # Make sure the directory is there so we can create it later
1252 opt_dir = dirname(current_vars_file)
1253 if not isdir(opt_dir):
1254 mkdir(opt_dir)
1255
1256 # Get default build variables from source tree. Variables are
1257 # normally determined by name of $VARIANT_DIR, but can be
1258 # overridden by '--default=' arg on command line.
1259 default = GetOption('default')
1260 opts_dir = joinpath(main.root.abspath, 'build_opts')
1261 if default:
1262 default_vars_files = [joinpath(build_root, 'variables', default),
1263 joinpath(opts_dir, default)]
1264 else:
1265 default_vars_files = [joinpath(opts_dir, variant_dir)]
1266 existing_files = filter(isfile, default_vars_files)
1267 if existing_files:
1268 default_vars_file = existing_files[0]
1269 sticky_vars.files.append(default_vars_file)
1270 print "Variables file %s not found,\n using defaults in %s" \
1271 % (current_vars_file, default_vars_file)
1272 else:
1273 print "Error: cannot find variables file %s or " \
1274 "default file(s) %s" \
1275 % (current_vars_file, ' or '.join(default_vars_files))
1276 Exit(1)
1277
1278 # Apply current variable settings to env
1279 sticky_vars.Update(env)
1280
1281 help_texts["local_vars"] += \
1282 "Build variables for %s:\n" % variant_dir \
1283 + sticky_vars.GenerateHelpText(env)
1284
1285 # Process variable settings.
1286
1287 if not have_fenv and env['USE_FENV']:
1288 print "Warning: <fenv.h> not available; " \
1289 "forcing USE_FENV to False in", variant_dir + "."
1290 env['USE_FENV'] = False
1291
1292 if not env['USE_FENV']:
1293 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
1294 print " FP results may deviate slightly from other platforms."
1295
1296 if env['EFENCE']:
1297 env.Append(LIBS=['efence'])
1298
1299 if env['USE_KVM']:
1300 if not have_kvm:
1301 print "Warning: Can not enable KVM, host seems to lack KVM support"
1302 env['USE_KVM'] = False
1303 elif not have_posix_timers:
1304 print "Warning: Can not enable KVM, host seems to lack support " \
1305 "for POSIX timers"
1306 env['USE_KVM'] = False
1307 elif not is_isa_kvm_compatible(env['TARGET_ISA']):
1308 print "Info: KVM support disabled due to unsupported host and " \
1309 "target ISA combination"
1310 env['USE_KVM'] = False
1311
1312 # Warn about missing optional functionality
1313 if env['USE_KVM']:
1314 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1315 print "Warning: perf_event headers lack support for the " \
1316 "exclude_host attribute. KVM instruction counts will " \
1317 "be inaccurate."
1318
1319 # Save sticky variable settings back to current variables file
1320 sticky_vars.Save(current_vars_file, env)
1321
1322 if env['USE_SSE2']:
1323 env.Append(CCFLAGS=['-msse2'])
1324
1325 # The src/SConscript file sets up the build rules in 'env' according
1326 # to the configured variables. It returns a list of environments,
1327 # one for each variant build (debug, opt, etc.)
1328 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env')
1329
1330def pairwise(iterable):
1331 "s -> (s0,s1), (s1,s2), (s2, s3), ..."
1332 a, b = itertools.tee(iterable)
1333 b.next()
1334 return itertools.izip(a, b)
1335
1336# Create false dependencies so SCons will parse ISAs, establish
1337# dependencies, and setup the build Environments serially. Either
1338# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
1339# greater than 1. It appears to be standard race condition stuff; it
1340# doesn't always fail, but usually, and the behaviors are different.
1341# Every time I tried to remove this, builds would fail in some
1342# creative new way. So, don't do that. You'll want to, though, because
1343# tests/SConscript takes a long time to make its Environments.
1344for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())):
1345 main.Depends('#%s-deps' % t2, '#%s-deps' % t1)
1346 main.Depends('#%s-environs' % t2, '#%s-environs' % t1)
1347
1348# base help text
1349Help('''
1350Usage: scons [scons options] [build variables] [target(s)]
1351
1352Extra scons options:
1353%(options)s
1354
1355Global build variables:
1356%(global_vars)s
1357
1358%(local_vars)s
1359''' % help_texts)
| 611 print ' Installed version:', clang_version
612 Exit(1)
613 else:
614 print 'Error: Unable to determine clang version.'
615 Exit(1)
616
617 # clang has a few additional warnings that we disable,
618 # tautological comparisons are allowed due to unsigned integers
619 # being compared to constants that happen to be 0, and extraneous
620 # parantheses are allowed due to Ruby's printing of the AST,
621 # finally self assignments are allowed as the generated CPU code
622 # is relying on this
623 main.Append(CCFLAGS=['-Wno-tautological-compare',
624 '-Wno-parentheses',
625 '-Wno-self-assign'])
626
627 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
628
629 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
630 # opposed to libstdc++, as the later is dated.
631 if sys.platform == "darwin":
632 main.Append(CXXFLAGS=['-stdlib=libc++'])
633 main.Append(LIBS=['c++'])
634
635else:
636 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
637 print "Don't know what compiler options to use for your compiler."
638 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
639 print termcap.Yellow + ' version:' + termcap.Normal,
640 if not CXX_version:
641 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
642 termcap.Normal
643 else:
644 print CXX_version.replace('\n', '<nl>')
645 print " If you're trying to use a compiler other than GCC"
646 print " or clang, there appears to be something wrong with your"
647 print " environment."
648 print " "
649 print " If you are trying to use a compiler other than those listed"
650 print " above you will need to ease fix SConstruct and "
651 print " src/SConscript to support that compiler."
652 Exit(1)
653
654# Set up common yacc/bison flags (needed for Ruby)
655main['YACCFLAGS'] = '-d'
656main['YACCHXXFILESUFFIX'] = '.hh'
657
658# Do this after we save setting back, or else we'll tack on an
659# extra 'qdo' every time we run scons.
660if main['BATCH']:
661 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
662 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
663 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
664 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
665 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
666
667if sys.platform == 'cygwin':
668 # cygwin has some header file issues...
669 main.Append(CCFLAGS=["-Wno-uninitialized"])
670
671# Check for the protobuf compiler
672protoc_version = readCommand([main['PROTOC'], '--version'],
673 exception='').split()
674
675# First two words should be "libprotoc x.y.z"
676if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
677 print termcap.Yellow + termcap.Bold + \
678 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
679 ' Please install protobuf-compiler for tracing support.' + \
680 termcap.Normal
681 main['PROTOC'] = False
682else:
683 # Based on the availability of the compress stream wrappers,
684 # require 2.1.0
685 min_protoc_version = '2.1.0'
686 if compareVersions(protoc_version[1], min_protoc_version) < 0:
687 print termcap.Yellow + termcap.Bold + \
688 'Warning: protoc version', min_protoc_version, \
689 'or newer required.\n' + \
690 ' Installed version:', protoc_version[1], \
691 termcap.Normal
692 main['PROTOC'] = False
693 else:
694 # Attempt to determine the appropriate include path and
695 # library path using pkg-config, that means we also need to
696 # check for pkg-config. Note that it is possible to use
697 # protobuf without the involvement of pkg-config. Later on we
698 # check go a library config check and at that point the test
699 # will fail if libprotobuf cannot be found.
700 if readCommand(['pkg-config', '--version'], exception=''):
701 try:
702 # Attempt to establish what linking flags to add for protobuf
703 # using pkg-config
704 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
705 except:
706 print termcap.Yellow + termcap.Bold + \
707 'Warning: pkg-config could not get protobuf flags.' + \
708 termcap.Normal
709
710# Check for SWIG
711if not main.has_key('SWIG'):
712 print 'Error: SWIG utility not found.'
713 print ' Please install (see http://www.swig.org) and retry.'
714 Exit(1)
715
716# Check for appropriate SWIG version
717swig_version = readCommand([main['SWIG'], '-version'], exception='').split()
718# First 3 words should be "SWIG Version x.y.z"
719if len(swig_version) < 3 or \
720 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
721 print 'Error determining SWIG version.'
722 Exit(1)
723
724min_swig_version = '2.0.4'
725if compareVersions(swig_version[2], min_swig_version) < 0:
726 print 'Error: SWIG version', min_swig_version, 'or newer required.'
727 print ' Installed version:', swig_version[2]
728 Exit(1)
729
730# Set up SWIG flags & scanner
731swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
732main.Append(SWIGFLAGS=swig_flags)
733
734# filter out all existing swig scanners, they mess up the dependency
735# stuff for some reason
736scanners = []
737for scanner in main['SCANNERS']:
738 skeys = scanner.skeys
739 if skeys == '.i':
740 continue
741
742 if isinstance(skeys, (list, tuple)) and '.i' in skeys:
743 continue
744
745 scanners.append(scanner)
746
747# add the new swig scanner that we like better
748from SCons.Scanner import ClassicCPP as CPPScanner
749swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
750scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
751
752# replace the scanners list that has what we want
753main['SCANNERS'] = scanners
754
755# Add a custom Check function to the Configure context so that we can
756# figure out if the compiler adds leading underscores to global
757# variables. This is needed for the autogenerated asm files that we
758# use for embedding the python code.
759def CheckLeading(context):
760 context.Message("Checking for leading underscore in global variables...")
761 # 1) Define a global variable called x from asm so the C compiler
762 # won't change the symbol at all.
763 # 2) Declare that variable.
764 # 3) Use the variable
765 #
766 # If the compiler prepends an underscore, this will successfully
767 # link because the external symbol 'x' will be called '_x' which
768 # was defined by the asm statement. If the compiler does not
769 # prepend an underscore, this will not successfully link because
770 # '_x' will have been defined by assembly, while the C portion of
771 # the code will be trying to use 'x'
772 ret = context.TryLink('''
773 asm(".globl _x; _x: .byte 0");
774 extern int x;
775 int main() { return x; }
776 ''', extension=".c")
777 context.env.Append(LEADING_UNDERSCORE=ret)
778 context.Result(ret)
779 return ret
780
781# Add a custom Check function to test for structure members.
782def CheckMember(context, include, decl, member, include_quotes="<>"):
783 context.Message("Checking for member %s in %s..." %
784 (member, decl))
785 text = """
786#include %(header)s
787int main(){
788 %(decl)s test;
789 (void)test.%(member)s;
790 return 0;
791};
792""" % { "header" : include_quotes[0] + include + include_quotes[1],
793 "decl" : decl,
794 "member" : member,
795 }
796
797 ret = context.TryCompile(text, extension=".cc")
798 context.Result(ret)
799 return ret
800
801# Platform-specific configuration. Note again that we assume that all
802# builds under a given build root run on the same host platform.
803conf = Configure(main,
804 conf_dir = joinpath(build_root, '.scons_config'),
805 log_file = joinpath(build_root, 'scons_config.log'),
806 custom_tests = {
807 'CheckLeading' : CheckLeading,
808 'CheckMember' : CheckMember,
809 })
810
811# Check for leading underscores. Don't really need to worry either
812# way so don't need to check the return code.
813conf.CheckLeading()
814
815# Check if we should compile a 64 bit binary on Mac OS X/Darwin
816try:
817 import platform
818 uname = platform.uname()
819 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
820 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
821 main.Append(CCFLAGS=['-arch', 'x86_64'])
822 main.Append(CFLAGS=['-arch', 'x86_64'])
823 main.Append(LINKFLAGS=['-arch', 'x86_64'])
824 main.Append(ASFLAGS=['-arch', 'x86_64'])
825except:
826 pass
827
828# Recent versions of scons substitute a "Null" object for Configure()
829# when configuration isn't necessary, e.g., if the "--help" option is
830# present. Unfortuantely this Null object always returns false,
831# breaking all our configuration checks. We replace it with our own
832# more optimistic null object that returns True instead.
833if not conf:
834 def NullCheck(*args, **kwargs):
835 return True
836
837 class NullConf:
838 def __init__(self, env):
839 self.env = env
840 def Finish(self):
841 return self.env
842 def __getattr__(self, mname):
843 return NullCheck
844
845 conf = NullConf(main)
846
847# Cache build files in the supplied directory.
848if main['M5_BUILD_CACHE']:
849 print 'Using build cache located at', main['M5_BUILD_CACHE']
850 CacheDir(main['M5_BUILD_CACHE'])
851
852# Find Python include and library directories for embedding the
853# interpreter. We rely on python-config to resolve the appropriate
854# includes and linker flags. ParseConfig does not seem to understand
855# the more exotic linker flags such as -Xlinker and -export-dynamic so
856# we add them explicitly below. If you want to link in an alternate
857# version of python, see above for instructions on how to invoke
858# scons with the appropriate PATH set.
859#
860# First we check if python2-config exists, else we use python-config
861python_config = readCommand(['which', 'python2-config'], exception='').strip()
862if not os.path.exists(python_config):
863 python_config = readCommand(['which', 'python-config'],
864 exception='').strip()
865py_includes = readCommand([python_config, '--includes'],
866 exception='').split()
867# Strip the -I from the include folders before adding them to the
868# CPPPATH
869main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes))
870
871# Read the linker flags and split them into libraries and other link
872# flags. The libraries are added later through the call the CheckLib.
873py_ld_flags = readCommand([python_config, '--ldflags'], exception='').split()
874py_libs = []
875for lib in py_ld_flags:
876 if not lib.startswith('-l'):
877 main.Append(LINKFLAGS=[lib])
878 else:
879 lib = lib[2:]
880 if lib not in py_libs:
881 py_libs.append(lib)
882
883# verify that this stuff works
884if not conf.CheckHeader('Python.h', '<>'):
885 print "Error: can't find Python.h header in", py_includes
886 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
887 Exit(1)
888
889for lib in py_libs:
890 if not conf.CheckLib(lib):
891 print "Error: can't find library %s required by python" % lib
892 Exit(1)
893
894# On Solaris you need to use libsocket for socket ops
895if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
896 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
897 print "Can't find library with socket calls (e.g. accept())"
898 Exit(1)
899
900# Check for zlib. If the check passes, libz will be automatically
901# added to the LIBS environment variable.
902if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
903 print 'Error: did not find needed zlib compression library '\
904 'and/or zlib.h header file.'
905 print ' Please install zlib and try again.'
906 Exit(1)
907
908# If we have the protobuf compiler, also make sure we have the
909# development libraries. If the check passes, libprotobuf will be
910# automatically added to the LIBS environment variable. After
911# this, we can use the HAVE_PROTOBUF flag to determine if we have
912# got both protoc and libprotobuf available.
913main['HAVE_PROTOBUF'] = main['PROTOC'] and \
914 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
915 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
916
917# If we have the compiler but not the library, print another warning.
918if main['PROTOC'] and not main['HAVE_PROTOBUF']:
919 print termcap.Yellow + termcap.Bold + \
920 'Warning: did not find protocol buffer library and/or headers.\n' + \
921 ' Please install libprotobuf-dev for tracing support.' + \
922 termcap.Normal
923
924# Check for librt.
925have_posix_clock = \
926 conf.CheckLibWithHeader(None, 'time.h', 'C',
927 'clock_nanosleep(0,0,NULL,NULL);') or \
928 conf.CheckLibWithHeader('rt', 'time.h', 'C',
929 'clock_nanosleep(0,0,NULL,NULL);')
930
931have_posix_timers = \
932 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
933 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
934
935if conf.CheckLib('tcmalloc'):
936 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
937elif conf.CheckLib('tcmalloc_minimal'):
938 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
939else:
940 print termcap.Yellow + termcap.Bold + \
941 "You can get a 12% performance improvement by installing tcmalloc "\
942 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \
943 termcap.Normal
944
945if not have_posix_clock:
946 print "Can't find library for POSIX clocks."
947
948# Check for <fenv.h> (C99 FP environment control)
949have_fenv = conf.CheckHeader('fenv.h', '<>')
950if not have_fenv:
951 print "Warning: Header file <fenv.h> not found."
952 print " This host has no IEEE FP rounding mode control."
953
954# Check if we should enable KVM-based hardware virtualization. The API
955# we rely on exists since version 2.6.36 of the kernel, but somehow
956# the KVM_API_VERSION does not reflect the change. We test for one of
957# the types as a fall back.
958have_kvm = conf.CheckHeader('linux/kvm.h', '<>') and \
959 conf.CheckTypeSize('struct kvm_xsave', '#include <linux/kvm.h>') != 0
960if not have_kvm:
961 print "Info: Compatible header file <linux/kvm.h> not found, " \
962 "disabling KVM support."
963
964# Check if the requested target ISA is compatible with the host
965def is_isa_kvm_compatible(isa):
966 isa_comp_table = {
967 "arm" : ( "armv7l" ),
968 "x86" : ( "x86_64" ),
969 }
970 try:
971 import platform
972 host_isa = platform.machine()
973 except:
974 print "Warning: Failed to determine host ISA."
975 return False
976
977 return host_isa in isa_comp_table.get(isa, [])
978
979
980# Check if the exclude_host attribute is available. We want this to
981# get accurate instruction counts in KVM.
982main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember(
983 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
984
985
986######################################################################
987#
988# Finish the configuration
989#
990main = conf.Finish()
991
992######################################################################
993#
994# Collect all non-global variables
995#
996
997# Define the universe of supported ISAs
998all_isa_list = [ ]
999Export('all_isa_list')
1000
1001class CpuModel(object):
1002 '''The CpuModel class encapsulates everything the ISA parser needs to
1003 know about a particular CPU model.'''
1004
1005 # Dict of available CPU model objects. Accessible as CpuModel.dict.
1006 dict = {}
1007 list = []
1008 defaults = []
1009
1010 # Constructor. Automatically adds models to CpuModel.dict.
1011 def __init__(self, name, filename, includes, strings, default=False):
1012 self.name = name # name of model
1013 self.filename = filename # filename for output exec code
1014 self.includes = includes # include files needed in exec file
1015 # The 'strings' dict holds all the per-CPU symbols we can
1016 # substitute into templates etc.
1017 self.strings = strings
1018
1019 # This cpu is enabled by default
1020 self.default = default
1021
1022 # Add self to dict
1023 if name in CpuModel.dict:
1024 raise AttributeError, "CpuModel '%s' already registered" % name
1025 CpuModel.dict[name] = self
1026 CpuModel.list.append(name)
1027
1028Export('CpuModel')
1029
1030# Sticky variables get saved in the variables file so they persist from
1031# one invocation to the next (unless overridden, in which case the new
1032# value becomes sticky).
1033sticky_vars = Variables(args=ARGUMENTS)
1034Export('sticky_vars')
1035
1036# Sticky variables that should be exported
1037export_vars = []
1038Export('export_vars')
1039
1040# For Ruby
1041all_protocols = []
1042Export('all_protocols')
1043protocol_dirs = []
1044Export('protocol_dirs')
1045slicc_includes = []
1046Export('slicc_includes')
1047
1048# Walk the tree and execute all SConsopts scripts that wil add to the
1049# above variables
1050if GetOption('verbose'):
1051 print "Reading SConsopts"
1052for bdir in [ base_dir ] + extras_dir_list:
1053 if not isdir(bdir):
1054 print "Error: directory '%s' does not exist" % bdir
1055 Exit(1)
1056 for root, dirs, files in os.walk(bdir):
1057 if 'SConsopts' in files:
1058 if GetOption('verbose'):
1059 print "Reading", joinpath(root, 'SConsopts')
1060 SConscript(joinpath(root, 'SConsopts'))
1061
1062all_isa_list.sort()
1063
1064sticky_vars.AddVariables(
1065 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
1066 ListVariable('CPU_MODELS', 'CPU models',
1067 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
1068 sorted(CpuModel.list)),
1069 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1070 False),
1071 BoolVariable('SS_COMPATIBLE_FP',
1072 'Make floating-point results compatible with SimpleScalar',
1073 False),
1074 BoolVariable('USE_SSE2',
1075 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1076 False),
1077 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
1078 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
1079 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1080 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
1081 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1082 all_protocols),
1083 )
1084
1085# These variables get exported to #defines in config/*.hh (see src/SConscript).
1086export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1087 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF',
1088 'HAVE_PERF_ATTR_EXCLUDE_HOST']
1089
1090###################################################
1091#
1092# Define a SCons builder for configuration flag headers.
1093#
1094###################################################
1095
1096# This function generates a config header file that #defines the
1097# variable symbol to the current variable setting (0 or 1). The source
1098# operands are the name of the variable and a Value node containing the
1099# value of the variable.
1100def build_config_file(target, source, env):
1101 (variable, value) = [s.get_contents() for s in source]
1102 f = file(str(target[0]), 'w')
1103 print >> f, '#define', variable, value
1104 f.close()
1105 return None
1106
1107# Combine the two functions into a scons Action object.
1108config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))
1109
1110# The emitter munges the source & target node lists to reflect what
1111# we're really doing.
1112def config_emitter(target, source, env):
1113 # extract variable name from Builder arg
1114 variable = str(target[0])
1115 # True target is config header file
1116 target = joinpath('config', variable.lower() + '.hh')
1117 val = env[variable]
1118 if isinstance(val, bool):
1119 # Force value to 0/1
1120 val = int(val)
1121 elif isinstance(val, str):
1122 val = '"' + val + '"'
1123
1124 # Sources are variable name & value (packaged in SCons Value nodes)
1125 return ([target], [Value(variable), Value(val)])
1126
1127config_builder = Builder(emitter = config_emitter, action = config_action)
1128
1129main.Append(BUILDERS = { 'ConfigFile' : config_builder })
1130
1131# libelf build is shared across all configs in the build root.
1132main.SConscript('ext/libelf/SConscript',
1133 variant_dir = joinpath(build_root, 'libelf'))
1134
1135# gzstream build is shared across all configs in the build root.
1136main.SConscript('ext/gzstream/SConscript',
1137 variant_dir = joinpath(build_root, 'gzstream'))
1138
1139# libfdt build is shared across all configs in the build root.
1140main.SConscript('ext/libfdt/SConscript',
1141 variant_dir = joinpath(build_root, 'libfdt'))
1142
1143# fputils build is shared across all configs in the build root.
1144main.SConscript('ext/fputils/SConscript',
1145 variant_dir = joinpath(build_root, 'fputils'))
1146
1147# DRAMSim2 build is shared across all configs in the build root.
1148main.SConscript('ext/dramsim2/SConscript',
1149 variant_dir = joinpath(build_root, 'dramsim2'))
1150
1151###################################################
1152#
1153# This function is used to set up a directory with switching headers
1154#
1155###################################################
1156
1157main['ALL_ISA_LIST'] = all_isa_list
1158all_isa_deps = {}
1159def make_switching_dir(dname, switch_headers, env):
1160 # Generate the header. target[0] is the full path of the output
1161 # header to generate. 'source' is a dummy variable, since we get the
1162 # list of ISAs from env['ALL_ISA_LIST'].
1163 def gen_switch_hdr(target, source, env):
1164 fname = str(target[0])
1165 isa = env['TARGET_ISA'].lower()
1166 try:
1167 f = open(fname, 'w')
1168 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
1169 f.close()
1170 except IOError:
1171 print "Failed to create %s" % fname
1172 raise
1173
1174 # Build SCons Action object. 'varlist' specifies env vars that this
1175 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1176 # should get re-executed.
1177 switch_hdr_action = MakeAction(gen_switch_hdr,
1178 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
1179
1180 # Instantiate actions for each header
1181 for hdr in switch_headers:
1182 env.Command(hdr, [], switch_hdr_action)
1183
1184 isa_target = Dir('.').up().name.lower().replace('_', '-')
1185 env['PHONY_BASE'] = '#'+isa_target
1186 all_isa_deps[isa_target] = None
1187
1188Export('make_switching_dir')
1189
1190# all-isas -> all-deps -> all-environs -> all_targets
1191main.Alias('#all-isas', [])
1192main.Alias('#all-deps', '#all-isas')
1193
1194# Dummy target to ensure all environments are created before telling
1195# SCons what to actually make (the command line arguments). We attach
1196# them to the dependence graph after the environments are complete.
1197ORIG_BUILD_TARGETS = list(BUILD_TARGETS) # force a copy; gets closure to work.
1198def environsComplete(target, source, env):
1199 for t in ORIG_BUILD_TARGETS:
1200 main.Depends('#all-targets', t)
1201
1202# Each build/* switching_dir attaches its *-environs target to #all-environs.
1203main.Append(BUILDERS = {'CompleteEnvirons' :
1204 Builder(action=MakeAction(environsComplete, None))})
1205main.CompleteEnvirons('#all-environs', [])
1206
1207def doNothing(**ignored): pass
1208main.Append(BUILDERS = {'Dummy': Builder(action=MakeAction(doNothing, None))})
1209
1210# The final target to which all the original targets ultimately get attached.
1211main.Dummy('#all-targets', '#all-environs')
1212BUILD_TARGETS[:] = ['#all-targets']
1213
1214###################################################
1215#
1216# Define build environments for selected configurations.
1217#
1218###################################################
1219
1220for variant_path in variant_paths:
1221 if not GetOption('silent'):
1222 print "Building in", variant_path
1223
1224 # Make a copy of the build-root environment to use for this config.
1225 env = main.Clone()
1226 env['BUILDDIR'] = variant_path
1227
1228 # variant_dir is the tail component of build path, and is used to
1229 # determine the build parameters (e.g., 'ALPHA_SE')
1230 (build_root, variant_dir) = splitpath(variant_path)
1231
1232 # Set env variables according to the build directory config.
1233 sticky_vars.files = []
1234 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1235 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1236 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1237 current_vars_file = joinpath(build_root, 'variables', variant_dir)
1238 if isfile(current_vars_file):
1239 sticky_vars.files.append(current_vars_file)
1240 if not GetOption('silent'):
1241 print "Using saved variables file %s" % current_vars_file
1242 else:
1243 # Build dir-specific variables file doesn't exist.
1244
1245 # Make sure the directory is there so we can create it later
1246 opt_dir = dirname(current_vars_file)
1247 if not isdir(opt_dir):
1248 mkdir(opt_dir)
1249
1250 # Get default build variables from source tree. Variables are
1251 # normally determined by name of $VARIANT_DIR, but can be
1252 # overridden by '--default=' arg on command line.
1253 default = GetOption('default')
1254 opts_dir = joinpath(main.root.abspath, 'build_opts')
1255 if default:
1256 default_vars_files = [joinpath(build_root, 'variables', default),
1257 joinpath(opts_dir, default)]
1258 else:
1259 default_vars_files = [joinpath(opts_dir, variant_dir)]
1260 existing_files = filter(isfile, default_vars_files)
1261 if existing_files:
1262 default_vars_file = existing_files[0]
1263 sticky_vars.files.append(default_vars_file)
1264 print "Variables file %s not found,\n using defaults in %s" \
1265 % (current_vars_file, default_vars_file)
1266 else:
1267 print "Error: cannot find variables file %s or " \
1268 "default file(s) %s" \
1269 % (current_vars_file, ' or '.join(default_vars_files))
1270 Exit(1)
1271
1272 # Apply current variable settings to env
1273 sticky_vars.Update(env)
1274
1275 help_texts["local_vars"] += \
1276 "Build variables for %s:\n" % variant_dir \
1277 + sticky_vars.GenerateHelpText(env)
1278
1279 # Process variable settings.
1280
1281 if not have_fenv and env['USE_FENV']:
1282 print "Warning: <fenv.h> not available; " \
1283 "forcing USE_FENV to False in", variant_dir + "."
1284 env['USE_FENV'] = False
1285
1286 if not env['USE_FENV']:
1287 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
1288 print " FP results may deviate slightly from other platforms."
1289
1290 if env['EFENCE']:
1291 env.Append(LIBS=['efence'])
1292
1293 if env['USE_KVM']:
1294 if not have_kvm:
1295 print "Warning: Can not enable KVM, host seems to lack KVM support"
1296 env['USE_KVM'] = False
1297 elif not have_posix_timers:
1298 print "Warning: Can not enable KVM, host seems to lack support " \
1299 "for POSIX timers"
1300 env['USE_KVM'] = False
1301 elif not is_isa_kvm_compatible(env['TARGET_ISA']):
1302 print "Info: KVM support disabled due to unsupported host and " \
1303 "target ISA combination"
1304 env['USE_KVM'] = False
1305
1306 # Warn about missing optional functionality
1307 if env['USE_KVM']:
1308 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1309 print "Warning: perf_event headers lack support for the " \
1310 "exclude_host attribute. KVM instruction counts will " \
1311 "be inaccurate."
1312
1313 # Save sticky variable settings back to current variables file
1314 sticky_vars.Save(current_vars_file, env)
1315
1316 if env['USE_SSE2']:
1317 env.Append(CCFLAGS=['-msse2'])
1318
1319 # The src/SConscript file sets up the build rules in 'env' according
1320 # to the configured variables. It returns a list of environments,
1321 # one for each variant build (debug, opt, etc.)
1322 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env')
1323
1324def pairwise(iterable):
1325 "s -> (s0,s1), (s1,s2), (s2, s3), ..."
1326 a, b = itertools.tee(iterable)
1327 b.next()
1328 return itertools.izip(a, b)
1329
1330# Create false dependencies so SCons will parse ISAs, establish
1331# dependencies, and setup the build Environments serially. Either
1332# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
1333# greater than 1. It appears to be standard race condition stuff; it
1334# doesn't always fail, but usually, and the behaviors are different.
1335# Every time I tried to remove this, builds would fail in some
1336# creative new way. So, don't do that. You'll want to, though, because
1337# tests/SConscript takes a long time to make its Environments.
1338for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())):
1339 main.Depends('#%s-deps' % t2, '#%s-deps' % t1)
1340 main.Depends('#%s-environs' % t2, '#%s-environs' % t1)
1341
1342# base help text
1343Help('''
1344Usage: scons [scons options] [build variables] [target(s)]
1345
1346Extra scons options:
1347%(options)s
1348
1349Global build variables:
1350%(global_vars)s
1351
1352%(local_vars)s
1353''' % help_texts)
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