1# -*- mode:python -*-
2
3# Copyright (c) 2013, 2015 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('--with-cxx-config', dest='with_cxx_config',
177 action='store_true',
178 help="Build with support for C++-based configuration")
179AddLocalOption('--default', dest='default', type='string', action='store',
180 help='Override which build_opts file to use for defaults')
181AddLocalOption('--ignore-style', dest='ignore_style', action='store_true',
182 help='Disable style checking hooks')
183AddLocalOption('--no-lto', dest='no_lto', action='store_true',
184 help='Disable Link-Time Optimization for fast')
185AddLocalOption('--update-ref', dest='update_ref', action='store_true',
186 help='Update test reference outputs')
187AddLocalOption('--verbose', dest='verbose', action='store_true',
188 help='Print full tool command lines')
189AddLocalOption('--without-python', dest='without_python',
190 action='store_true',
191 help='Build without Python configuration support')
192AddLocalOption('--without-tcmalloc', dest='without_tcmalloc',
193 action='store_true',
194 help='Disable linking against tcmalloc')
195AddLocalOption('--with-ubsan', dest='with_ubsan', action='store_true',
196 help='Build with Undefined Behavior Sanitizer if available')
197
198termcap = get_termcap(GetOption('use_colors'))
199
200########################################################################
201#
202# Set up the main build environment.
203#
204########################################################################
205
206# export TERM so that clang reports errors in color
207use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
208 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC',
209 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ])
210
211use_prefixes = [
212 "M5", # M5 configuration (e.g., path to kernels)
213 "DISTCC_", # distcc (distributed compiler wrapper) configuration
214 "CCACHE_", # ccache (caching compiler wrapper) configuration
215 "CCC_", # clang static analyzer configuration
216 ]
217
218use_env = {}
219for key,val in sorted(os.environ.iteritems()):
220 if key in use_vars or \
221 any([key.startswith(prefix) for prefix in use_prefixes]):
222 use_env[key] = val
223
224# Tell scons to avoid implicit command dependencies to avoid issues
225# with the param wrappes being compiled twice (see
226# http://scons.tigris.org/issues/show_bug.cgi?id=2811)
227main = Environment(ENV=use_env, IMPLICIT_COMMAND_DEPENDENCIES=0)
228main.Decider('MD5-timestamp')
229main.root = Dir(".") # The current directory (where this file lives).
230main.srcdir = Dir("src") # The source directory
231
232main_dict_keys = main.Dictionary().keys()
233
234# Check that we have a C/C++ compiler
235if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
236 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
237 Exit(1)
238
239# Check that swig is present
240if not 'SWIG' in main_dict_keys:
241 print "swig is not installed (package swig on Ubuntu and RedHat)"
242 Exit(1)
243
244# add useful python code PYTHONPATH so it can be used by subprocesses
245# as well
246main.AppendENVPath('PYTHONPATH', extra_python_paths)
247
248########################################################################
249#
250# Mercurial Stuff.
251#
252# If the gem5 directory is a mercurial repository, we should do some
253# extra things.
254#
255########################################################################
256
257hgdir = main.root.Dir(".hg")
258
259mercurial_style_message = """
260You're missing the gem5 style hook, which automatically checks your code
261against the gem5 style rules on hg commit and qrefresh commands. This
262script will now install the hook in your .hg/hgrc file.
263Press enter to continue, or ctrl-c to abort: """
264
265mercurial_style_hook = """
266# The following lines were automatically added by gem5/SConstruct
267# to provide the gem5 style-checking hooks
268[extensions]
269style = %s/util/style.py
270
271[hooks]
272pretxncommit.style = python:style.check_style
273pre-qrefresh.style = python:style.check_style
274# End of SConstruct additions
275
276""" % (main.root.abspath)
277
278mercurial_lib_not_found = """
279Mercurial libraries cannot be found, ignoring style hook. If
280you are a gem5 developer, please fix this and run the style
281hook. It is important.
282"""
283
284# Check for style hook and prompt for installation if it's not there.
285# Skip this if --ignore-style was specified, there's no .hg dir to
286# install a hook in, or there's no interactive terminal to prompt.
287if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
288 style_hook = True
289 try:
290 from mercurial import ui
291 ui = ui.ui()
292 ui.readconfig(hgdir.File('hgrc').abspath)
293 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
294 ui.config('hooks', 'pre-qrefresh.style', None)
295 except ImportError:
296 print mercurial_lib_not_found
297
298 if not style_hook:
299 print mercurial_style_message,
300 # continue unless user does ctrl-c/ctrl-d etc.
301 try:
302 raw_input()
303 except:
304 print "Input exception, exiting scons.\n"
305 sys.exit(1)
306 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
307 print "Adding style hook to", hgrc_path, "\n"
308 try:
309 hgrc = open(hgrc_path, 'a')
310 hgrc.write(mercurial_style_hook)
311 hgrc.close()
312 except:
313 print "Error updating", hgrc_path
314 sys.exit(1)
315
316
317###################################################
318#
319# Figure out which configurations to set up based on the path(s) of
320# the target(s).
321#
322###################################################
323
324# Find default configuration & binary.
325Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
326
327# helper function: find last occurrence of element in list
328def rfind(l, elt, offs = -1):
329 for i in range(len(l)+offs, 0, -1):
330 if l[i] == elt:
331 return i
332 raise ValueError, "element not found"
333
334# Take a list of paths (or SCons Nodes) and return a list with all
335# paths made absolute and ~-expanded. Paths will be interpreted
336# relative to the launch directory unless a different root is provided
337def makePathListAbsolute(path_list, root=GetLaunchDir()):
338 return [abspath(joinpath(root, expanduser(str(p))))
339 for p in path_list]
340
341# Each target must have 'build' in the interior of the path; the
342# directory below this will determine the build parameters. For
343# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
344# recognize that ALPHA_SE specifies the configuration because it
345# follow 'build' in the build path.
346
347# The funky assignment to "[:]" is needed to replace the list contents
348# in place rather than reassign the symbol to a new list, which
349# doesn't work (obviously!).
350BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
351
352# Generate a list of the unique build roots and configs that the
353# collected targets reference.
354variant_paths = []
355build_root = None
356for t in BUILD_TARGETS:
357 path_dirs = t.split('/')
358 try:
359 build_top = rfind(path_dirs, 'build', -2)
360 except:
361 print "Error: no non-leaf 'build' dir found on target path", t
362 Exit(1)
363 this_build_root = joinpath('/',*path_dirs[:build_top+1])
364 if not build_root:
365 build_root = this_build_root
366 else:
367 if this_build_root != build_root:
368 print "Error: build targets not under same build root\n"\
369 " %s\n %s" % (build_root, this_build_root)
370 Exit(1)
371 variant_path = joinpath('/',*path_dirs[:build_top+2])
372 if variant_path not in variant_paths:
373 variant_paths.append(variant_path)
374
375# Make sure build_root exists (might not if this is the first build there)
376if not isdir(build_root):
377 mkdir(build_root)
378main['BUILDROOT'] = build_root
379
380Export('main')
381
382main.SConsignFile(joinpath(build_root, "sconsign"))
383
384# Default duplicate option is to use hard links, but this messes up
385# when you use emacs to edit a file in the target dir, as emacs moves
386# file to file~ then copies to file, breaking the link. Symbolic
387# (soft) links work better.
388main.SetOption('duplicate', 'soft-copy')
389
390#
391# Set up global sticky variables... these are common to an entire build
392# tree (not specific to a particular build like ALPHA_SE)
393#
394
395global_vars_file = joinpath(build_root, 'variables.global')
396
397global_vars = Variables(global_vars_file, args=ARGUMENTS)
398
399global_vars.AddVariables(
400 ('CC', 'C compiler', environ.get('CC', main['CC'])),
401 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
402 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])),
403 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')),
404 ('BATCH', 'Use batch pool for build and tests', False),
405 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
406 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
407 ('EXTRAS', 'Add extra directories to the compilation', '')
408 )
409
410# Update main environment with values from ARGUMENTS & global_vars_file
411global_vars.Update(main)
412help_texts["global_vars"] += global_vars.GenerateHelpText(main)
413
414# Save sticky variable settings back to current variables file
415global_vars.Save(global_vars_file, main)
416
417# Parse EXTRAS variable to build list of all directories where we're
418# look for sources etc. This list is exported as extras_dir_list.
419base_dir = main.srcdir.abspath
420if main['EXTRAS']:
421 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
422else:
423 extras_dir_list = []
424
425Export('base_dir')
426Export('extras_dir_list')
427
428# the ext directory should be on the #includes path
429main.Append(CPPPATH=[Dir('ext')])
430
431def strip_build_path(path, env):
432 path = str(path)
433 variant_base = env['BUILDROOT'] + os.path.sep
434 if path.startswith(variant_base):
435 path = path[len(variant_base):]
436 elif path.startswith('build/'):
437 path = path[6:]
438 return path
439
440# Generate a string of the form:
441# common/path/prefix/src1, src2 -> tgt1, tgt2
442# to print while building.
443class Transform(object):
444 # all specific color settings should be here and nowhere else
445 tool_color = termcap.Normal
446 pfx_color = termcap.Yellow
447 srcs_color = termcap.Yellow + termcap.Bold
448 arrow_color = termcap.Blue + termcap.Bold
449 tgts_color = termcap.Yellow + termcap.Bold
450
451 def __init__(self, tool, max_sources=99):
452 self.format = self.tool_color + (" [%8s] " % tool) \
453 + self.pfx_color + "%s" \
454 + self.srcs_color + "%s" \
455 + self.arrow_color + " -> " \
456 + self.tgts_color + "%s" \
457 + termcap.Normal
458 self.max_sources = max_sources
459
460 def __call__(self, target, source, env, for_signature=None):
461 # truncate source list according to max_sources param
462 source = source[0:self.max_sources]
463 def strip(f):
464 return strip_build_path(str(f), env)
465 if len(source) > 0:
466 srcs = map(strip, source)
467 else:
468 srcs = ['']
469 tgts = map(strip, target)
470 # surprisingly, os.path.commonprefix is a dumb char-by-char string
471 # operation that has nothing to do with paths.
472 com_pfx = os.path.commonprefix(srcs + tgts)
473 com_pfx_len = len(com_pfx)
474 if com_pfx:
475 # do some cleanup and sanity checking on common prefix
476 if com_pfx[-1] == ".":
477 # prefix matches all but file extension: ok
478 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
479 com_pfx = com_pfx[0:-1]
480 elif com_pfx[-1] == "/":
481 # common prefix is directory path: OK
482 pass
483 else:
484 src0_len = len(srcs[0])
485 tgt0_len = len(tgts[0])
486 if src0_len == com_pfx_len:
487 # source is a substring of target, OK
488 pass
489 elif tgt0_len == com_pfx_len:
490 # target is a substring of source, need to back up to
491 # avoid empty string on RHS of arrow
492 sep_idx = com_pfx.rfind(".")
493 if sep_idx != -1:
494 com_pfx = com_pfx[0:sep_idx]
495 else:
496 com_pfx = ''
497 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
498 # still splitting at file extension: ok
499 pass
500 else:
501 # probably a fluke; ignore it
502 com_pfx = ''
503 # recalculate length in case com_pfx was modified
504 com_pfx_len = len(com_pfx)
505 def fmt(files):
506 f = map(lambda s: s[com_pfx_len:], files)
507 return ', '.join(f)
508 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
509
510Export('Transform')
511
512# enable the regression script to use the termcap
513main['TERMCAP'] = termcap
514
515if GetOption('verbose'):
516 def MakeAction(action, string, *args, **kwargs):
517 return Action(action, *args, **kwargs)
518else:
519 MakeAction = Action
520 main['CCCOMSTR'] = Transform("CC")
521 main['CXXCOMSTR'] = Transform("CXX")
522 main['ASCOMSTR'] = Transform("AS")
523 main['SWIGCOMSTR'] = Transform("SWIG")
524 main['ARCOMSTR'] = Transform("AR", 0)
525 main['LINKCOMSTR'] = Transform("LINK", 0)
526 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
527 main['M4COMSTR'] = Transform("M4")
528 main['SHCCCOMSTR'] = Transform("SHCC")
529 main['SHCXXCOMSTR'] = Transform("SHCXX")
530Export('MakeAction')
531
532# Initialize the Link-Time Optimization (LTO) flags
533main['LTO_CCFLAGS'] = []
534main['LTO_LDFLAGS'] = []
535
536# According to the readme, tcmalloc works best if the compiler doesn't
537# assume that we're using the builtin malloc and friends. These flags
538# are compiler-specific, so we need to set them after we detect which
539# compiler we're using.
540main['TCMALLOC_CCFLAGS'] = []
541
542CXX_version = readCommand([main['CXX'],'--version'], exception=False)
543CXX_V = readCommand([main['CXX'],'-V'], exception=False)
544
545main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
546main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
547if main['GCC'] + main['CLANG'] > 1:
548 print 'Error: How can we have two at the same time?'
549 Exit(1)
550
551# Set up default C++ compiler flags
552if main['GCC'] or main['CLANG']:
553 # As gcc and clang share many flags, do the common parts here
554 main.Append(CCFLAGS=['-pipe'])
555 main.Append(CCFLAGS=['-fno-strict-aliasing'])
556 # Enable -Wall and then disable the few warnings that we
557 # consistently violate
558 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
559 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
560 # actually use that name, so we stick with c++0x
561 main.Append(CXXFLAGS=['-std=c++0x'])
562 # Add selected sanity checks from -Wextra
563 main.Append(CXXFLAGS=['-Wmissing-field-initializers',
564 '-Woverloaded-virtual'])
565else:
566 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
567 print "Don't know what compiler options to use for your compiler."
568 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
569 print termcap.Yellow + ' version:' + termcap.Normal,
570 if not CXX_version:
571 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
572 termcap.Normal
573 else:
574 print CXX_version.replace('\n', '<nl>')
575 print " If you're trying to use a compiler other than GCC"
576 print " or clang, there appears to be something wrong with your"
577 print " environment."
578 print " "
579 print " If you are trying to use a compiler other than those listed"
580 print " above you will need to ease fix SConstruct and "
581 print " src/SConscript to support that compiler."
582 Exit(1)
583
584if main['GCC']:
585 # Check for a supported version of gcc. >= 4.6 is chosen for its
586 # level of c++11 support. See
587 # http://gcc.gnu.org/projects/cxx0x.html for details. 4.6 is also
588 # the first version with proper LTO support.
589 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
590 if compareVersions(gcc_version, "4.6") < 0:
591 print 'Error: gcc version 4.6 or newer required.'
592 print ' Installed version:', gcc_version
593 Exit(1)
594
595 main['GCC_VERSION'] = gcc_version
596
597 # gcc from version 4.8 and above generates "rep; ret" instructions
598 # to avoid performance penalties on certain AMD chips. Older
599 # assemblers detect this as an error, "Error: expecting string
600 # instruction after `rep'"
601 if compareVersions(gcc_version, "4.8") > 0:
602 as_version_raw = readCommand([main['AS'], '-v', '/dev/null'],
603 exception=False).split()
604
605 # version strings may contain extra distro-specific
606 # qualifiers, so play it safe and keep only what comes before
607 # the first hyphen
608 as_version = as_version_raw[-1].split('-')[0] if as_version_raw \
609 else None
610
611 if not as_version or compareVersions(as_version, "2.23") < 0:
612 print termcap.Yellow + termcap.Bold + \
613 'Warning: This combination of gcc and binutils have' + \
614 ' known incompatibilities.\n' + \
615 ' If you encounter build problems, please update ' + \
616 'binutils to 2.23.' + \
617 termcap.Normal
618
619 # Make sure we warn if the user has requested to compile with the
620 # Undefined Benahvior Sanitizer and this version of gcc does not
621 # support it.
622 if GetOption('with_ubsan') and \
623 compareVersions(gcc_version, '4.9') < 0:
624 print termcap.Yellow + termcap.Bold + \
625 'Warning: UBSan is only supported using gcc 4.9 and later.' + \
626 termcap.Normal
627
628 # Add the appropriate Link-Time Optimization (LTO) flags
629 # unless LTO is explicitly turned off. Note that these flags
630 # are only used by the fast target.
631 if not GetOption('no_lto'):
632 # Pass the LTO flag when compiling to produce GIMPLE
633 # output, we merely create the flags here and only append
634 # them later
635 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
636
637 # Use the same amount of jobs for LTO as we are running
638 # scons with
639 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
640
641 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc',
642 '-fno-builtin-realloc', '-fno-builtin-free'])
643
644elif main['CLANG']:
645 # Check for a supported version of clang, >= 3.0 is needed to
646 # support similar features as gcc 4.6. See
647 # http://clang.llvm.org/cxx_status.html for details
648 clang_version_re = re.compile(".* version (\d+\.\d+)")
649 clang_version_match = clang_version_re.search(CXX_version)
650 if (clang_version_match):
651 clang_version = clang_version_match.groups()[0]
652 if compareVersions(clang_version, "3.0") < 0:
653 print 'Error: clang version 3.0 or newer required.'
654 print ' Installed version:', clang_version
655 Exit(1)
656 else:
657 print 'Error: Unable to determine clang version.'
658 Exit(1)
659
660 # clang has a few additional warnings that we disable,
661 # tautological comparisons are allowed due to unsigned integers
662 # being compared to constants that happen to be 0, and extraneous
663 # parantheses are allowed due to Ruby's printing of the AST,
664 # finally self assignments are allowed as the generated CPU code
665 # is relying on this
666 main.Append(CCFLAGS=['-Wno-tautological-compare',
667 '-Wno-parentheses',
668 '-Wno-self-assign',
669 # Some versions of libstdc++ (4.8?) seem to
670 # use struct hash and class hash
671 # interchangeably.
672 '-Wno-mismatched-tags',
673 ])
674
675 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
676
677 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
678 # opposed to libstdc++, as the later is dated.
679 if sys.platform == "darwin":
680 main.Append(CXXFLAGS=['-stdlib=libc++'])
681 main.Append(LIBS=['c++'])
682
683else:
684 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
685 print "Don't know what compiler options to use for your compiler."
686 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
687 print termcap.Yellow + ' version:' + termcap.Normal,
688 if not CXX_version:
689 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
690 termcap.Normal
691 else:
692 print CXX_version.replace('\n', '<nl>')
693 print " If you're trying to use a compiler other than GCC"
694 print " or clang, there appears to be something wrong with your"
695 print " environment."
696 print " "
697 print " If you are trying to use a compiler other than those listed"
698 print " above you will need to ease fix SConstruct and "
699 print " src/SConscript to support that compiler."
700 Exit(1)
701
702# Set up common yacc/bison flags (needed for Ruby)
703main['YACCFLAGS'] = '-d'
704main['YACCHXXFILESUFFIX'] = '.hh'
705
706# Do this after we save setting back, or else we'll tack on an
707# extra 'qdo' every time we run scons.
708if main['BATCH']:
709 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
710 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
711 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
712 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
713 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
714
715if sys.platform == 'cygwin':
716 # cygwin has some header file issues...
717 main.Append(CCFLAGS=["-Wno-uninitialized"])
718
719# Check for the protobuf compiler
720protoc_version = readCommand([main['PROTOC'], '--version'],
721 exception='').split()
722
723# First two words should be "libprotoc x.y.z"
724if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
725 print termcap.Yellow + termcap.Bold + \
726 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
727 ' Please install protobuf-compiler for tracing support.' + \
728 termcap.Normal
729 main['PROTOC'] = False
730else:
731 # Based on the availability of the compress stream wrappers,
732 # require 2.1.0
733 min_protoc_version = '2.1.0'
734 if compareVersions(protoc_version[1], min_protoc_version) < 0:
735 print termcap.Yellow + termcap.Bold + \
736 'Warning: protoc version', min_protoc_version, \
737 'or newer required.\n' + \
738 ' Installed version:', protoc_version[1], \
739 termcap.Normal
740 main['PROTOC'] = False
741 else:
742 # Attempt to determine the appropriate include path and
743 # library path using pkg-config, that means we also need to
744 # check for pkg-config. Note that it is possible to use
745 # protobuf without the involvement of pkg-config. Later on we
746 # check go a library config check and at that point the test
747 # will fail if libprotobuf cannot be found.
748 if readCommand(['pkg-config', '--version'], exception=''):
749 try:
750 # Attempt to establish what linking flags to add for protobuf
751 # using pkg-config
752 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
753 except:
754 print termcap.Yellow + termcap.Bold + \
755 'Warning: pkg-config could not get protobuf flags.' + \
756 termcap.Normal
757
758# Check for SWIG
759if not main.has_key('SWIG'):
760 print 'Error: SWIG utility not found.'
761 print ' Please install (see http://www.swig.org) and retry.'
762 Exit(1)
763
764# Check for appropriate SWIG version
765swig_version = readCommand([main['SWIG'], '-version'], exception='').split()
766# First 3 words should be "SWIG Version x.y.z"
767if len(swig_version) < 3 or \
768 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
769 print 'Error determining SWIG version.'
770 Exit(1)
771
772min_swig_version = '2.0.4'
773if compareVersions(swig_version[2], min_swig_version) < 0:
774 print 'Error: SWIG version', min_swig_version, 'or newer required.'
775 print ' Installed version:', swig_version[2]
776 Exit(1)
777
778# Check for known incompatibilities. The standard library shipped with
779# gcc >= 4.9 does not play well with swig versions prior to 3.0
780if main['GCC'] and compareVersions(gcc_version, '4.9') >= 0 and \
781 compareVersions(swig_version[2], '3.0') < 0:
782 print termcap.Yellow + termcap.Bold + \
783 'Warning: This combination of gcc and swig have' + \
784 ' known incompatibilities.\n' + \
785 ' If you encounter build problems, please update ' + \
786 'swig to 3.0 or later.' + \
787 termcap.Normal
788
789# Set up SWIG flags & scanner
790swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
791main.Append(SWIGFLAGS=swig_flags)
792
793# Check for 'timeout' from GNU coreutils. If present, regressions will
794# be run with a time limit. We require version 8.13 since we rely on
795# support for the '--foreground' option.
796timeout_lines = readCommand(['timeout', '--version'],
797 exception='').splitlines()
798# Get the first line and tokenize it
799timeout_version = timeout_lines[0].split() if timeout_lines else []
800main['TIMEOUT'] = timeout_version and \
801 compareVersions(timeout_version[-1], '8.13') >= 0
802
803# filter out all existing swig scanners, they mess up the dependency
804# stuff for some reason
805scanners = []
806for scanner in main['SCANNERS']:
807 skeys = scanner.skeys
808 if skeys == '.i':
809 continue
810
811 if isinstance(skeys, (list, tuple)) and '.i' in skeys:
812 continue
813
814 scanners.append(scanner)
815
816# add the new swig scanner that we like better
817from SCons.Scanner import ClassicCPP as CPPScanner
818swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
819scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
820
821# replace the scanners list that has what we want
822main['SCANNERS'] = scanners
823
824# Add a custom Check function to the Configure context so that we can
825# figure out if the compiler adds leading underscores to global
826# variables. This is needed for the autogenerated asm files that we
827# use for embedding the python code.
828def CheckLeading(context):
829 context.Message("Checking for leading underscore in global variables...")
830 # 1) Define a global variable called x from asm so the C compiler
831 # won't change the symbol at all.
832 # 2) Declare that variable.
833 # 3) Use the variable
834 #
835 # If the compiler prepends an underscore, this will successfully
836 # link because the external symbol 'x' will be called '_x' which
837 # was defined by the asm statement. If the compiler does not
838 # prepend an underscore, this will not successfully link because
839 # '_x' will have been defined by assembly, while the C portion of
840 # the code will be trying to use 'x'
841 ret = context.TryLink('''
842 asm(".globl _x; _x: .byte 0");
843 extern int x;
844 int main() { return x; }
845 ''', extension=".c")
846 context.env.Append(LEADING_UNDERSCORE=ret)
847 context.Result(ret)
848 return ret
849
850# Add a custom Check function to test for structure members.
851def CheckMember(context, include, decl, member, include_quotes="<>"):
852 context.Message("Checking for member %s in %s..." %
853 (member, decl))
854 text = """
855#include %(header)s
856int main(){
857 %(decl)s test;
858 (void)test.%(member)s;
859 return 0;
860};
861""" % { "header" : include_quotes[0] + include + include_quotes[1],
862 "decl" : decl,
863 "member" : member,
864 }
865
866 ret = context.TryCompile(text, extension=".cc")
867 context.Result(ret)
868 return ret
869
870# Platform-specific configuration. Note again that we assume that all
871# builds under a given build root run on the same host platform.
872conf = Configure(main,
873 conf_dir = joinpath(build_root, '.scons_config'),
874 log_file = joinpath(build_root, 'scons_config.log'),
875 custom_tests = {
876 'CheckLeading' : CheckLeading,
877 'CheckMember' : CheckMember,
878 })
879
880# Check for leading underscores. Don't really need to worry either
881# way so don't need to check the return code.
882conf.CheckLeading()
883
884# Check if we should compile a 64 bit binary on Mac OS X/Darwin
885try:
886 import platform
887 uname = platform.uname()
888 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
889 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
890 main.Append(CCFLAGS=['-arch', 'x86_64'])
891 main.Append(CFLAGS=['-arch', 'x86_64'])
892 main.Append(LINKFLAGS=['-arch', 'x86_64'])
893 main.Append(ASFLAGS=['-arch', 'x86_64'])
894except:
895 pass
896
897# Recent versions of scons substitute a "Null" object for Configure()
898# when configuration isn't necessary, e.g., if the "--help" option is
899# present. Unfortuantely this Null object always returns false,
900# breaking all our configuration checks. We replace it with our own
901# more optimistic null object that returns True instead.
902if not conf:
903 def NullCheck(*args, **kwargs):
904 return True
905
906 class NullConf:
907 def __init__(self, env):
908 self.env = env
909 def Finish(self):
910 return self.env
911 def __getattr__(self, mname):
912 return NullCheck
913
914 conf = NullConf(main)
915
916# Cache build files in the supplied directory.
917if main['M5_BUILD_CACHE']:
918 print 'Using build cache located at', main['M5_BUILD_CACHE']
919 CacheDir(main['M5_BUILD_CACHE'])
920
921if not GetOption('without_python'):
922 # Find Python include and library directories for embedding the
923 # interpreter. We rely on python-config to resolve the appropriate
924 # includes and linker flags. ParseConfig does not seem to understand
925 # the more exotic linker flags such as -Xlinker and -export-dynamic so
926 # we add them explicitly below. If you want to link in an alternate
927 # version of python, see above for instructions on how to invoke
928 # scons with the appropriate PATH set.
929 #
930 # First we check if python2-config exists, else we use python-config
931 python_config = readCommand(['which', 'python2-config'],
932 exception='').strip()
933 if not os.path.exists(python_config):
934 python_config = readCommand(['which', 'python-config'],
935 exception='').strip()
936 py_includes = readCommand([python_config, '--includes'],
937 exception='').split()
938 # Strip the -I from the include folders before adding them to the
939 # CPPPATH
940 main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes))
941
942 # Read the linker flags and split them into libraries and other link
943 # flags. The libraries are added later through the call the CheckLib.
944 py_ld_flags = readCommand([python_config, '--ldflags'],
945 exception='').split()
946 py_libs = []
947 for lib in py_ld_flags:
948 if not lib.startswith('-l'):
949 main.Append(LINKFLAGS=[lib])
950 else:
951 lib = lib[2:]
952 if lib not in py_libs:
953 py_libs.append(lib)
954
955 # verify that this stuff works
956 if not conf.CheckHeader('Python.h', '<>'):
957 print "Error: can't find Python.h header in", py_includes
958 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
959 Exit(1)
960
961 for lib in py_libs:
962 if not conf.CheckLib(lib):
963 print "Error: can't find library %s required by python" % lib
964 Exit(1)
965
966# On Solaris you need to use libsocket for socket ops
967if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
968 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
969 print "Can't find library with socket calls (e.g. accept())"
970 Exit(1)
971
972# Check for zlib. If the check passes, libz will be automatically
973# added to the LIBS environment variable.
974if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
975 print 'Error: did not find needed zlib compression library '\
976 'and/or zlib.h header file.'
977 print ' Please install zlib and try again.'
978 Exit(1)
979
980# If we have the protobuf compiler, also make sure we have the
981# development libraries. If the check passes, libprotobuf will be
982# automatically added to the LIBS environment variable. After
983# this, we can use the HAVE_PROTOBUF flag to determine if we have
984# got both protoc and libprotobuf available.
985main['HAVE_PROTOBUF'] = main['PROTOC'] and \
986 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
987 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
988
989# If we have the compiler but not the library, print another warning.
990if main['PROTOC'] and not main['HAVE_PROTOBUF']:
991 print termcap.Yellow + termcap.Bold + \
992 'Warning: did not find protocol buffer library and/or headers.\n' + \
993 ' Please install libprotobuf-dev for tracing support.' + \
994 termcap.Normal
995
996# Check for librt.
997have_posix_clock = \
998 conf.CheckLibWithHeader(None, 'time.h', 'C',
999 'clock_nanosleep(0,0,NULL,NULL);') or \
1000 conf.CheckLibWithHeader('rt', 'time.h', 'C',
1001 'clock_nanosleep(0,0,NULL,NULL);')
1002
1003have_posix_timers = \
1004 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
1005 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
1006
1007if not GetOption('without_tcmalloc'):
1008 if conf.CheckLib('tcmalloc'):
1009 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
1010 elif conf.CheckLib('tcmalloc_minimal'):
1011 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
1012 else:
1013 print termcap.Yellow + termcap.Bold + \
1014 "You can get a 12% performance improvement by "\
1015 "installing tcmalloc (libgoogle-perftools-dev package "\
1016 "on Ubuntu or RedHat)." + termcap.Normal
1017
1018if not have_posix_clock:
1019 print "Can't find library for POSIX clocks."
1020
1021# Check for <fenv.h> (C99 FP environment control)
1022have_fenv = conf.CheckHeader('fenv.h', '<>')
1023if not have_fenv:
1024 print "Warning: Header file <fenv.h> not found."
1025 print " This host has no IEEE FP rounding mode control."
1026
1027# Check if we should enable KVM-based hardware virtualization. The API
1028# we rely on exists since version 2.6.36 of the kernel, but somehow
1029# the KVM_API_VERSION does not reflect the change. We test for one of
1030# the types as a fall back.
1031have_kvm = conf.CheckHeader('linux/kvm.h', '<>')
1032if not have_kvm:
1033 print "Info: Compatible header file <linux/kvm.h> not found, " \
1034 "disabling KVM support."
1035
1036# x86 needs support for xsave. We test for the structure here since we
1037# won't be able to run new tests by the time we know which ISA we're
1038# targeting.
1039have_kvm_xsave = conf.CheckTypeSize('struct kvm_xsave',
1040 '#include <linux/kvm.h>') != 0
1041
1042# Check if the requested target ISA is compatible with the host
1043def is_isa_kvm_compatible(isa):
1044 try:
1045 import platform
1046 host_isa = platform.machine()
1047 except:
1048 print "Warning: Failed to determine host ISA."
1049 return False
1050
1051 if not have_posix_timers:
1052 print "Warning: Can not enable KVM, host seems to lack support " \
1053 "for POSIX timers"
1054 return False
1055
1056 if isa == "arm":
1057 return host_isa in ( "armv7l", "aarch64" )
1058 elif isa == "x86":
1059 if host_isa != "x86_64":
1060 return False
1061
1062 if not have_kvm_xsave:
1063 print "KVM on x86 requires xsave support in kernel headers."
1064 return False
1065
1066 return True
1067 else:
1068 return False
1069
1070
1071# Check if the exclude_host attribute is available. We want this to
1072# get accurate instruction counts in KVM.
1073main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember(
1074 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
1075
1076
1077######################################################################
1078#
1079# Finish the configuration
1080#
1081main = conf.Finish()
1082
1083######################################################################
1084#
1085# Collect all non-global variables
1086#
1087
1088# Define the universe of supported ISAs
1089all_isa_list = [ ]
1090Export('all_isa_list')
1091
1092class CpuModel(object):
1093 '''The CpuModel class encapsulates everything the ISA parser needs to
1094 know about a particular CPU model.'''
1095
1096 # Dict of available CPU model objects. Accessible as CpuModel.dict.
1097 dict = {}
1098
1099 # Constructor. Automatically adds models to CpuModel.dict.
1100 def __init__(self, name, default=False):
1101 self.name = name # name of model
1102
1103 # This cpu is enabled by default
1104 self.default = default
1105
1106 # Add self to dict
1107 if name in CpuModel.dict:
1108 raise AttributeError, "CpuModel '%s' already registered" % name
1109 CpuModel.dict[name] = self
1110
1111Export('CpuModel')
1112
1113# Sticky variables get saved in the variables file so they persist from
1114# one invocation to the next (unless overridden, in which case the new
1115# value becomes sticky).
1116sticky_vars = Variables(args=ARGUMENTS)
1117Export('sticky_vars')
1118
1119# Sticky variables that should be exported
1120export_vars = []
1121Export('export_vars')
1122
1123# For Ruby
1124all_protocols = []
1125Export('all_protocols')
1126protocol_dirs = []
1127Export('protocol_dirs')
1128slicc_includes = []
1129Export('slicc_includes')
1130
1131# Walk the tree and execute all SConsopts scripts that wil add to the
1132# above variables
1133if GetOption('verbose'):
1134 print "Reading SConsopts"
1135for bdir in [ base_dir ] + extras_dir_list:
1136 if not isdir(bdir):
1137 print "Error: directory '%s' does not exist" % bdir
1138 Exit(1)
1139 for root, dirs, files in os.walk(bdir):
1140 if 'SConsopts' in files:
1141 if GetOption('verbose'):
1142 print "Reading", joinpath(root, 'SConsopts')
1143 SConscript(joinpath(root, 'SConsopts'))
1144
1145all_isa_list.sort()
1146
1147sticky_vars.AddVariables(
1148 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
1149 ListVariable('CPU_MODELS', 'CPU models',
1150 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
1151 sorted(CpuModel.dict.keys())),
1152 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1153 False),
1154 BoolVariable('SS_COMPATIBLE_FP',
1155 'Make floating-point results compatible with SimpleScalar',
1156 False),
1157 BoolVariable('USE_SSE2',
1158 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1159 False),
1160 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
1161 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
1162 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1163 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
1164 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1165 all_protocols),
1166 )
1167
1168# These variables get exported to #defines in config/*.hh (see src/SConscript).
1169export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1170 'USE_POSIX_CLOCK', 'USE_KVM', 'PROTOCOL', 'HAVE_PROTOBUF',
1171 'HAVE_PERF_ATTR_EXCLUDE_HOST']
1172
1173###################################################
1174#
1175# Define a SCons builder for configuration flag headers.
1176#
1177###################################################
1178
1179# This function generates a config header file that #defines the
1180# variable symbol to the current variable setting (0 or 1). The source
1181# operands are the name of the variable and a Value node containing the
1182# value of the variable.
1183def build_config_file(target, source, env):
1184 (variable, value) = [s.get_contents() for s in source]
1185 f = file(str(target[0]), 'w')
1186 print >> f, '#define', variable, value
1187 f.close()
1188 return None
1189
1190# Combine the two functions into a scons Action object.
1191config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))
1192
1193# The emitter munges the source & target node lists to reflect what
1194# we're really doing.
1195def config_emitter(target, source, env):
1196 # extract variable name from Builder arg
1197 variable = str(target[0])
1198 # True target is config header file
1199 target = joinpath('config', variable.lower() + '.hh')
1200 val = env[variable]
1201 if isinstance(val, bool):
1202 # Force value to 0/1
1203 val = int(val)
1204 elif isinstance(val, str):
1205 val = '"' + val + '"'
1206
1207 # Sources are variable name & value (packaged in SCons Value nodes)
1208 return ([target], [Value(variable), Value(val)])
1209
1210config_builder = Builder(emitter = config_emitter, action = config_action)
1211
1212main.Append(BUILDERS = { 'ConfigFile' : config_builder })
1213
1214# libelf build is shared across all configs in the build root.
1215main.SConscript('ext/libelf/SConscript',
1216 variant_dir = joinpath(build_root, 'libelf'))
1217
1218# gzstream build is shared across all configs in the build root.
1219main.SConscript('ext/gzstream/SConscript',
1220 variant_dir = joinpath(build_root, 'gzstream'))
1221
1222# libfdt build is shared across all configs in the build root.
1223main.SConscript('ext/libfdt/SConscript',
1224 variant_dir = joinpath(build_root, 'libfdt'))
1225
1226# fputils build is shared across all configs in the build root.
1227main.SConscript('ext/fputils/SConscript',
1228 variant_dir = joinpath(build_root, 'fputils'))
1229
1230# DRAMSim2 build is shared across all configs in the build root.
1231main.SConscript('ext/dramsim2/SConscript',
1232 variant_dir = joinpath(build_root, 'dramsim2'))
1233
1234# DRAMPower build is shared across all configs in the build root.
1235main.SConscript('ext/drampower/SConscript',
1236 variant_dir = joinpath(build_root, 'drampower'))
1237
1238###################################################
1239#
1240# This function is used to set up a directory with switching headers
1241#
1242###################################################
1243
1244main['ALL_ISA_LIST'] = all_isa_list
1245all_isa_deps = {}
1246def make_switching_dir(dname, switch_headers, env):
1247 # Generate the header. target[0] is the full path of the output
1248 # header to generate. 'source' is a dummy variable, since we get the
1249 # list of ISAs from env['ALL_ISA_LIST'].
1250 def gen_switch_hdr(target, source, env):
1251 fname = str(target[0])
1252 isa = env['TARGET_ISA'].lower()
1253 try:
1254 f = open(fname, 'w')
1255 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
1256 f.close()
1257 except IOError:
1258 print "Failed to create %s" % fname
1259 raise
1260
1261 # Build SCons Action object. 'varlist' specifies env vars that this
1262 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1263 # should get re-executed.
1264 switch_hdr_action = MakeAction(gen_switch_hdr,
1265 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
1266
1267 # Instantiate actions for each header
1268 for hdr in switch_headers:
1269 env.Command(hdr, [], switch_hdr_action)
1270
1271 isa_target = Dir('.').up().name.lower().replace('_', '-')
1272 env['PHONY_BASE'] = '#'+isa_target
1273 all_isa_deps[isa_target] = None
1274
1275Export('make_switching_dir')
1276
1277# all-isas -> all-deps -> all-environs -> all_targets
1278main.Alias('#all-isas', [])
1279main.Alias('#all-deps', '#all-isas')
1280
1281# Dummy target to ensure all environments are created before telling
1282# SCons what to actually make (the command line arguments). We attach
1283# them to the dependence graph after the environments are complete.
1284ORIG_BUILD_TARGETS = list(BUILD_TARGETS) # force a copy; gets closure to work.
1285def environsComplete(target, source, env):
1286 for t in ORIG_BUILD_TARGETS:
1287 main.Depends('#all-targets', t)
1288
1289# Each build/* switching_dir attaches its *-environs target to #all-environs.
1290main.Append(BUILDERS = {'CompleteEnvirons' :
1291 Builder(action=MakeAction(environsComplete, None))})
1292main.CompleteEnvirons('#all-environs', [])
1293
1294def doNothing(**ignored): pass
1295main.Append(BUILDERS = {'Dummy': Builder(action=MakeAction(doNothing, None))})
1296
1297# The final target to which all the original targets ultimately get attached.
1298main.Dummy('#all-targets', '#all-environs')
1299BUILD_TARGETS[:] = ['#all-targets']
1300
1301###################################################
1302#
1303# Define build environments for selected configurations.
1304#
1305###################################################
1306
1307for variant_path in variant_paths:
1308 if not GetOption('silent'):
1309 print "Building in", variant_path
1310
1311 # Make a copy of the build-root environment to use for this config.
1312 env = main.Clone()
1313 env['BUILDDIR'] = variant_path
1314
1315 # variant_dir is the tail component of build path, and is used to
1316 # determine the build parameters (e.g., 'ALPHA_SE')
1317 (build_root, variant_dir) = splitpath(variant_path)
1318
1319 # Set env variables according to the build directory config.
1320 sticky_vars.files = []
1321 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1322 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1323 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1324 current_vars_file = joinpath(build_root, 'variables', variant_dir)
1325 if isfile(current_vars_file):
1326 sticky_vars.files.append(current_vars_file)
1327 if not GetOption('silent'):
1328 print "Using saved variables file %s" % current_vars_file
1329 else:
1330 # Build dir-specific variables file doesn't exist.
1331
1332 # Make sure the directory is there so we can create it later
1333 opt_dir = dirname(current_vars_file)
1334 if not isdir(opt_dir):
1335 mkdir(opt_dir)
1336
1337 # Get default build variables from source tree. Variables are
1338 # normally determined by name of $VARIANT_DIR, but can be
1339 # overridden by '--default=' arg on command line.
1340 default = GetOption('default')
1341 opts_dir = joinpath(main.root.abspath, 'build_opts')
1342 if default:
1343 default_vars_files = [joinpath(build_root, 'variables', default),
1344 joinpath(opts_dir, default)]
1345 else:
1346 default_vars_files = [joinpath(opts_dir, variant_dir)]
1347 existing_files = filter(isfile, default_vars_files)
1348 if existing_files:
1349 default_vars_file = existing_files[0]
1350 sticky_vars.files.append(default_vars_file)
1351 print "Variables file %s not found,\n using defaults in %s" \
1352 % (current_vars_file, default_vars_file)
1353 else:
1354 print "Error: cannot find variables file %s or " \
1355 "default file(s) %s" \
1356 % (current_vars_file, ' or '.join(default_vars_files))
1357 Exit(1)
1358
1359 # Apply current variable settings to env
1360 sticky_vars.Update(env)
1361
1362 help_texts["local_vars"] += \
1363 "Build variables for %s:\n" % variant_dir \
1364 + sticky_vars.GenerateHelpText(env)
1365
1366 # Process variable settings.
1367
1368 if not have_fenv and env['USE_FENV']:
1369 print "Warning: <fenv.h> not available; " \
1370 "forcing USE_FENV to False in", variant_dir + "."
1371 env['USE_FENV'] = False
1372
1373 if not env['USE_FENV']:
1374 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
1375 print " FP results may deviate slightly from other platforms."
1376
1377 if env['EFENCE']:
1378 env.Append(LIBS=['efence'])
1379
1380 if env['USE_KVM']:
1381 if not have_kvm:
1382 print "Warning: Can not enable KVM, host seems to lack KVM support"
1383 env['USE_KVM'] = False
1384 elif not is_isa_kvm_compatible(env['TARGET_ISA']):
1385 print "Info: KVM support disabled due to unsupported host and " \
1386 "target ISA combination"
1387 env['USE_KVM'] = False
1388
1389 # Warn about missing optional functionality
1390 if env['USE_KVM']:
1391 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1392 print "Warning: perf_event headers lack support for the " \
1393 "exclude_host attribute. KVM instruction counts will " \
1394 "be inaccurate."
1395
1396 # Save sticky variable settings back to current variables file
1397 sticky_vars.Save(current_vars_file, env)
1398
1399 if env['USE_SSE2']:
1400 env.Append(CCFLAGS=['-msse2'])
1401
1402 # The src/SConscript file sets up the build rules in 'env' according
1403 # to the configured variables. It returns a list of environments,
1404 # one for each variant build (debug, opt, etc.)
1405 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env')
1406
1407def pairwise(iterable):
1408 "s -> (s0,s1), (s1,s2), (s2, s3), ..."
1409 a, b = itertools.tee(iterable)
1410 b.next()
1411 return itertools.izip(a, b)
1412
1413# Create false dependencies so SCons will parse ISAs, establish
1414# dependencies, and setup the build Environments serially. Either
1415# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
1416# greater than 1. It appears to be standard race condition stuff; it
1417# doesn't always fail, but usually, and the behaviors are different.
1418# Every time I tried to remove this, builds would fail in some
1419# creative new way. So, don't do that. You'll want to, though, because
1420# tests/SConscript takes a long time to make its Environments.
1421for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())):
1422 main.Depends('#%s-deps' % t2, '#%s-deps' % t1)
1423 main.Depends('#%s-environs' % t2, '#%s-environs' % t1)
1424
1425# base help text
1426Help('''
1427Usage: scons [scons options] [build variables] [target(s)]
1428
1429Extra scons options:
1430%(options)s
1431
1432Global build variables:
1433%(global_vars)s
1434
1435%(local_vars)s
1436''' % help_texts)