1# -*- mode:python -*-
2
3# Copyright (c) 2011 Advanced Micro Devices, Inc.
4# Copyright (c) 2009 The Hewlett-Packard Development Company
5# Copyright (c) 2004-2005 The Regents of The University of Michigan
6# All rights reserved.
7#
8# Redistribution and use in source and binary forms, with or without
9# modification, are permitted provided that the following conditions are
10# met: redistributions of source code must retain the above copyright
11# notice, this list of conditions and the following disclaimer;
12# redistributions in binary form must reproduce the above copyright
13# notice, this list of conditions and the following disclaimer in the
14# documentation and/or other materials provided with the distribution;
15# neither the name of the copyright holders nor the names of its
16# contributors may be used to endorse or promote products derived from
17# this software without specific prior written permission.
18#
19# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30#
31# Authors: Steve Reinhardt
32# Nathan Binkert
33
34###################################################
35#
36# SCons top-level build description (SConstruct) file.
37#
38# While in this directory ('gem5'), just type 'scons' to build the default
39# configuration (see below), or type 'scons build/<CONFIG>/<binary>'
40# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for
41# the optimized full-system version).
42#
43# You can build gem5 in a different directory as long as there is a
44# 'build/<CONFIG>' somewhere along the target path. The build system
45# expects that all configs under the same build directory are being
46# built for the same host system.
47#
48# Examples:
49#
50# The following two commands are equivalent. The '-u' option tells
51# scons to search up the directory tree for this SConstruct file.
52# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug
53# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug
54#
55# The following two commands are equivalent and demonstrate building
56# in a directory outside of the source tree. The '-C' option tells
57# scons to chdir to the specified directory to find this SConstruct
58# file.
59# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug
60# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug
61#
62# You can use 'scons -H' to print scons options. If you're in this
63# 'gem5' directory (or use -u or -C to tell scons where to find this
64# file), you can use 'scons -h' to print all the gem5-specific build
65# options as well.
66#
67###################################################
68
69# Check for recent-enough Python and SCons versions.
70try:
71 # Really old versions of scons only take two options for the
72 # function, so check once without the revision and once with the
73 # revision, the first instance will fail for stuff other than
74 # 0.98, and the second will fail for 0.98.0
75 EnsureSConsVersion(0, 98)
76 EnsureSConsVersion(0, 98, 1)
77except SystemExit, e:
78 print """
79For more details, see:
80 http://gem5.org/Dependencies
81"""
82 raise
83
84# We ensure the python version early because we have stuff that
85# requires python 2.4
86try:
87 EnsurePythonVersion(2, 4)
88except SystemExit, e:
89 print """
90You can use a non-default installation of the Python interpreter by
91either (1) rearranging your PATH so that scons finds the non-default
92'python' first or (2) explicitly invoking an alternative interpreter
93on the scons script.
94
95For more details, see:
96 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation
97"""
98 raise
99
100# Global Python includes
101import os
102import re
103import subprocess
104import sys
105
106from os import mkdir, environ
107from os.path import abspath, basename, dirname, expanduser, normpath
108from os.path import exists, isdir, isfile
109from os.path import join as joinpath, split as splitpath
110
111# SCons includes
112import SCons
113import SCons.Node
114
115extra_python_paths = [
116 Dir('src/python').srcnode().abspath, # gem5 includes
117 Dir('ext/ply').srcnode().abspath, # ply is used by several files
118 ]
119
120sys.path[1:1] = extra_python_paths
121
122from m5.util import compareVersions, readCommand
123from m5.util.terminal import get_termcap
124
125help_texts = {
126 "options" : "",
127 "global_vars" : "",
128 "local_vars" : ""
129}
130
131Export("help_texts")
132
133
134# There's a bug in scons in that (1) by default, the help texts from
135# AddOption() are supposed to be displayed when you type 'scons -h'
136# and (2) you can override the help displayed by 'scons -h' using the
137# Help() function, but these two features are incompatible: once
138# you've overridden the help text using Help(), there's no way to get
139# at the help texts from AddOptions. See:
140# http://scons.tigris.org/issues/show_bug.cgi?id=2356
141# http://scons.tigris.org/issues/show_bug.cgi?id=2611
142# This hack lets us extract the help text from AddOptions and
143# re-inject it via Help(). Ideally someday this bug will be fixed and
144# we can just use AddOption directly.
145def AddLocalOption(*args, **kwargs):
146 col_width = 30
147
148 help = " " + ", ".join(args)
149 if "help" in kwargs:
150 length = len(help)
151 if length >= col_width:
152 help += "\n" + " " * col_width
153 else:
154 help += " " * (col_width - length)
155 help += kwargs["help"]
156 help_texts["options"] += help + "\n"
157
158 AddOption(*args, **kwargs)
159
160AddLocalOption('--colors', dest='use_colors', action='store_true',
161 help="Add color to abbreviated scons output")
162AddLocalOption('--no-colors', dest='use_colors', action='store_false',
163 help="Don't add color to abbreviated scons output")
164AddLocalOption('--default', dest='default', type='string', action='store',
165 help='Override which build_opts file to use for defaults')
166AddLocalOption('--ignore-style', dest='ignore_style', action='store_true',
167 help='Disable style checking hooks')
168AddLocalOption('--no-lto', dest='no_lto', action='store_true',
169 help='Disable Link-Time Optimization for fast')
170AddLocalOption('--update-ref', dest='update_ref', action='store_true',
171 help='Update test reference outputs')
172AddLocalOption('--verbose', dest='verbose', action='store_true',
173 help='Print full tool command lines')
174
175termcap = get_termcap(GetOption('use_colors'))
176
177########################################################################
178#
179# Set up the main build environment.
180#
181########################################################################
182use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
183 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PYTHONPATH',
184 'RANLIB', 'SWIG' ])
185
186use_prefixes = [
187 "M5", # M5 configuration (e.g., path to kernels)
188 "DISTCC_", # distcc (distributed compiler wrapper) configuration
189 "CCACHE_", # ccache (caching compiler wrapper) configuration
190 "CCC_", # clang static analyzer configuration
191 ]
192
193use_env = {}
194for key,val in os.environ.iteritems():
195 if key in use_vars or \
196 any([key.startswith(prefix) for prefix in use_prefixes]):
197 use_env[key] = val
198
199main = Environment(ENV=use_env)
200main.Decider('MD5-timestamp')
201main.root = Dir(".") # The current directory (where this file lives).
202main.srcdir = Dir("src") # The source directory
203
204main_dict_keys = main.Dictionary().keys()
205
206# Check that we have a C/C++ compiler
207if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
208 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
209 Exit(1)
210
211# Check that swig is present
212if not 'SWIG' in main_dict_keys:
213 print "swig is not installed (package swig on Ubuntu and RedHat)"
214 Exit(1)
215
216# add useful python code PYTHONPATH so it can be used by subprocesses
217# as well
218main.AppendENVPath('PYTHONPATH', extra_python_paths)
219
220########################################################################
221#
222# Mercurial Stuff.
223#
224# If the gem5 directory is a mercurial repository, we should do some
225# extra things.
226#
227########################################################################
228
229hgdir = main.root.Dir(".hg")
230
231mercurial_style_message = """
232You're missing the gem5 style hook, which automatically checks your code
233against the gem5 style rules on hg commit and qrefresh commands. This
234script will now install the hook in your .hg/hgrc file.
235Press enter to continue, or ctrl-c to abort: """
236
237mercurial_style_hook = """
238# The following lines were automatically added by gem5/SConstruct
239# to provide the gem5 style-checking hooks
240[extensions]
241style = %s/util/style.py
242
243[hooks]
244pretxncommit.style = python:style.check_style
245pre-qrefresh.style = python:style.check_style
246# End of SConstruct additions
247
248""" % (main.root.abspath)
249
250mercurial_lib_not_found = """
251Mercurial libraries cannot be found, ignoring style hook. If
252you are a gem5 developer, please fix this and run the style
253hook. It is important.
254"""
255
256# Check for style hook and prompt for installation if it's not there.
257# Skip this if --ignore-style was specified, there's no .hg dir to
258# install a hook in, or there's no interactive terminal to prompt.
259if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
260 style_hook = True
261 try:
262 from mercurial import ui
263 ui = ui.ui()
264 ui.readconfig(hgdir.File('hgrc').abspath)
265 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
266 ui.config('hooks', 'pre-qrefresh.style', None)
267 except ImportError:
268 print mercurial_lib_not_found
269
270 if not style_hook:
271 print mercurial_style_message,
272 # continue unless user does ctrl-c/ctrl-d etc.
273 try:
274 raw_input()
275 except:
276 print "Input exception, exiting scons.\n"
277 sys.exit(1)
278 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
279 print "Adding style hook to", hgrc_path, "\n"
280 try:
281 hgrc = open(hgrc_path, 'a')
282 hgrc.write(mercurial_style_hook)
283 hgrc.close()
284 except:
285 print "Error updating", hgrc_path
286 sys.exit(1)
287
288
289###################################################
290#
291# Figure out which configurations to set up based on the path(s) of
292# the target(s).
293#
294###################################################
295
296# Find default configuration & binary.
297Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
298
299# helper function: find last occurrence of element in list
300def rfind(l, elt, offs = -1):
301 for i in range(len(l)+offs, 0, -1):
302 if l[i] == elt:
303 return i
304 raise ValueError, "element not found"
305
306# Take a list of paths (or SCons Nodes) and return a list with all
307# paths made absolute and ~-expanded. Paths will be interpreted
308# relative to the launch directory unless a different root is provided
309def makePathListAbsolute(path_list, root=GetLaunchDir()):
310 return [abspath(joinpath(root, expanduser(str(p))))
311 for p in path_list]
312
313# Each target must have 'build' in the interior of the path; the
314# directory below this will determine the build parameters. For
315# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
316# recognize that ALPHA_SE specifies the configuration because it
317# follow 'build' in the build path.
318
319# The funky assignment to "[:]" is needed to replace the list contents
320# in place rather than reassign the symbol to a new list, which
321# doesn't work (obviously!).
322BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
323
324# Generate a list of the unique build roots and configs that the
325# collected targets reference.
326variant_paths = []
327build_root = None
328for t in BUILD_TARGETS:
329 path_dirs = t.split('/')
330 try:
331 build_top = rfind(path_dirs, 'build', -2)
332 except:
333 print "Error: no non-leaf 'build' dir found on target path", t
334 Exit(1)
335 this_build_root = joinpath('/',*path_dirs[:build_top+1])
336 if not build_root:
337 build_root = this_build_root
338 else:
339 if this_build_root != build_root:
340 print "Error: build targets not under same build root\n"\
341 " %s\n %s" % (build_root, this_build_root)
342 Exit(1)
343 variant_path = joinpath('/',*path_dirs[:build_top+2])
344 if variant_path not in variant_paths:
345 variant_paths.append(variant_path)
346
347# Make sure build_root exists (might not if this is the first build there)
348if not isdir(build_root):
349 mkdir(build_root)
350main['BUILDROOT'] = build_root
351
352Export('main')
353
354main.SConsignFile(joinpath(build_root, "sconsign"))
355
356# Default duplicate option is to use hard links, but this messes up
357# when you use emacs to edit a file in the target dir, as emacs moves
358# file to file~ then copies to file, breaking the link. Symbolic
359# (soft) links work better.
360main.SetOption('duplicate', 'soft-copy')
361
362#
363# Set up global sticky variables... these are common to an entire build
364# tree (not specific to a particular build like ALPHA_SE)
365#
366
367global_vars_file = joinpath(build_root, 'variables.global')
368
369global_vars = Variables(global_vars_file, args=ARGUMENTS)
370
371global_vars.AddVariables(
372 ('CC', 'C compiler', environ.get('CC', main['CC'])),
373 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
374 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])),
375 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')),
376 ('BATCH', 'Use batch pool for build and tests', False),
377 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
378 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
379 ('EXTRAS', 'Add extra directories to the compilation', '')
380 )
381
382# Update main environment with values from ARGUMENTS & global_vars_file
383global_vars.Update(main)
384help_texts["global_vars"] += global_vars.GenerateHelpText(main)
385
386# Save sticky variable settings back to current variables file
387global_vars.Save(global_vars_file, main)
388
389# Parse EXTRAS variable to build list of all directories where we're
390# look for sources etc. This list is exported as extras_dir_list.
391base_dir = main.srcdir.abspath
392if main['EXTRAS']:
393 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
394else:
395 extras_dir_list = []
396
397Export('base_dir')
398Export('extras_dir_list')
399
400# the ext directory should be on the #includes path
401main.Append(CPPPATH=[Dir('ext')])
402
403def strip_build_path(path, env):
404 path = str(path)
405 variant_base = env['BUILDROOT'] + os.path.sep
406 if path.startswith(variant_base):
407 path = path[len(variant_base):]
408 elif path.startswith('build/'):
409 path = path[6:]
410 return path
411
412# Generate a string of the form:
413# common/path/prefix/src1, src2 -> tgt1, tgt2
414# to print while building.
415class Transform(object):
416 # all specific color settings should be here and nowhere else
417 tool_color = termcap.Normal
418 pfx_color = termcap.Yellow
419 srcs_color = termcap.Yellow + termcap.Bold
420 arrow_color = termcap.Blue + termcap.Bold
421 tgts_color = termcap.Yellow + termcap.Bold
422
423 def __init__(self, tool, max_sources=99):
424 self.format = self.tool_color + (" [%8s] " % tool) \
425 + self.pfx_color + "%s" \
426 + self.srcs_color + "%s" \
427 + self.arrow_color + " -> " \
428 + self.tgts_color + "%s" \
429 + termcap.Normal
430 self.max_sources = max_sources
431
432 def __call__(self, target, source, env, for_signature=None):
433 # truncate source list according to max_sources param
434 source = source[0:self.max_sources]
435 def strip(f):
436 return strip_build_path(str(f), env)
437 if len(source) > 0:
438 srcs = map(strip, source)
439 else:
440 srcs = ['']
441 tgts = map(strip, target)
442 # surprisingly, os.path.commonprefix is a dumb char-by-char string
443 # operation that has nothing to do with paths.
444 com_pfx = os.path.commonprefix(srcs + tgts)
445 com_pfx_len = len(com_pfx)
446 if com_pfx:
447 # do some cleanup and sanity checking on common prefix
448 if com_pfx[-1] == ".":
449 # prefix matches all but file extension: ok
450 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
451 com_pfx = com_pfx[0:-1]
452 elif com_pfx[-1] == "/":
453 # common prefix is directory path: OK
454 pass
455 else:
456 src0_len = len(srcs[0])
457 tgt0_len = len(tgts[0])
458 if src0_len == com_pfx_len:
459 # source is a substring of target, OK
460 pass
461 elif tgt0_len == com_pfx_len:
462 # target is a substring of source, need to back up to
463 # avoid empty string on RHS of arrow
464 sep_idx = com_pfx.rfind(".")
465 if sep_idx != -1:
466 com_pfx = com_pfx[0:sep_idx]
467 else:
468 com_pfx = ''
469 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
470 # still splitting at file extension: ok
471 pass
472 else:
473 # probably a fluke; ignore it
474 com_pfx = ''
475 # recalculate length in case com_pfx was modified
476 com_pfx_len = len(com_pfx)
477 def fmt(files):
478 f = map(lambda s: s[com_pfx_len:], files)
479 return ', '.join(f)
480 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
481
482Export('Transform')
483
484# enable the regression script to use the termcap
485main['TERMCAP'] = termcap
486
487if GetOption('verbose'):
488 def MakeAction(action, string, *args, **kwargs):
489 return Action(action, *args, **kwargs)
490else:
491 MakeAction = Action
492 main['CCCOMSTR'] = Transform("CC")
493 main['CXXCOMSTR'] = Transform("CXX")
494 main['ASCOMSTR'] = Transform("AS")
495 main['SWIGCOMSTR'] = Transform("SWIG")
496 main['ARCOMSTR'] = Transform("AR", 0)
497 main['LINKCOMSTR'] = Transform("LINK", 0)
498 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
499 main['M4COMSTR'] = Transform("M4")
500 main['SHCCCOMSTR'] = Transform("SHCC")
501 main['SHCXXCOMSTR'] = Transform("SHCXX")
502Export('MakeAction')
503
504# Initialize the Link-Time Optimization (LTO) flags
505main['LTO_CCFLAGS'] = []
506main['LTO_LDFLAGS'] = []
507
508# According to the readme, tcmalloc works best if the compiler doesn't
509# assume that we're using the builtin malloc and friends. These flags
510# are compiler-specific, so we need to set them after we detect which
511# compiler we're using.
512main['TCMALLOC_CCFLAGS'] = []
513
514CXX_version = readCommand([main['CXX'],'--version'], exception=False)
515CXX_V = readCommand([main['CXX'],'-V'], exception=False)
516
517main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
518main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
519if main['GCC'] + main['CLANG'] > 1:
520 print 'Error: How can we have two at the same time?'
521 Exit(1)
522
523# Set up default C++ compiler flags
524if main['GCC'] or main['CLANG']:
525 # As gcc and clang share many flags, do the common parts here
526 main.Append(CCFLAGS=['-pipe'])
527 main.Append(CCFLAGS=['-fno-strict-aliasing'])
528 # Enable -Wall and then disable the few warnings that we
529 # consistently violate
530 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
531 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
532 # actually use that name, so we stick with c++0x
533 main.Append(CXXFLAGS=['-std=c++0x'])
534 # Add selected sanity checks from -Wextra
535 main.Append(CXXFLAGS=['-Wmissing-field-initializers',
536 '-Woverloaded-virtual'])
537else:
538 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
539 print "Don't know what compiler options to use for your compiler."
540 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
541 print termcap.Yellow + ' version:' + termcap.Normal,
542 if not CXX_version:
543 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
544 termcap.Normal
545 else:
546 print CXX_version.replace('\n', '<nl>')
547 print " If you're trying to use a compiler other than GCC"
548 print " or clang, there appears to be something wrong with your"
549 print " environment."
550 print " "
551 print " If you are trying to use a compiler other than those listed"
552 print " above you will need to ease fix SConstruct and "
553 print " src/SConscript to support that compiler."
554 Exit(1)
555
556if main['GCC']:
557 # Check for a supported version of gcc, >= 4.4 is needed for c++0x
558 # support. See http://gcc.gnu.org/projects/cxx0x.html for details
559 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
560 if compareVersions(gcc_version, "4.4") < 0:
561 print 'Error: gcc version 4.4 or newer required.'
562 print ' Installed version:', gcc_version
563 Exit(1)
564
565 main['GCC_VERSION'] = gcc_version
566
567 # Check for versions with bugs
568 if not compareVersions(gcc_version, '4.4.1') or \
569 not compareVersions(gcc_version, '4.4.2'):
570 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
571 main.Append(CCFLAGS=['-fno-tree-vectorize'])
572
573 # LTO support is only really working properly from 4.6 and beyond
574 if compareVersions(gcc_version, '4.6') >= 0:
575 # Add the appropriate Link-Time Optimization (LTO) flags
576 # unless LTO is explicitly turned off. Note that these flags
577 # are only used by the fast target.
578 if not GetOption('no_lto'):
579 # Pass the LTO flag when compiling to produce GIMPLE
580 # output, we merely create the flags here and only append
581 # them later/
582 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
583
584 # Use the same amount of jobs for LTO as we are running
585 # scons with, we hardcode the use of the linker plugin
586 # which requires either gold or GNU ld >= 2.21
587 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
588 '-fuse-linker-plugin']
589
590 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc',
591 '-fno-builtin-realloc', '-fno-builtin-free'])
592
593elif main['CLANG']:
594 # Check for a supported version of clang, >= 2.9 is needed to
595 # support similar features as gcc 4.4. See
596 # http://clang.llvm.org/cxx_status.html for details
597 clang_version_re = re.compile(".* version (\d+\.\d+)")
598 clang_version_match = clang_version_re.match(CXX_version)
599 if (clang_version_match):
600 clang_version = clang_version_match.groups()[0]
601 if compareVersions(clang_version, "2.9") < 0:
602 print 'Error: clang version 2.9 or newer required.'
603 print ' Installed version:', clang_version
604 Exit(1)
605 else:
606 print 'Error: Unable to determine clang version.'
607 Exit(1)
608
609 # clang has a few additional warnings that we disable,
610 # tautological comparisons are allowed due to unsigned integers
611 # being compared to constants that happen to be 0, and extraneous
612 # parantheses are allowed due to Ruby's printing of the AST,
613 # finally self assignments are allowed as the generated CPU code
614 # is relying on this
615 main.Append(CCFLAGS=['-Wno-tautological-compare',
616 '-Wno-parentheses',
617 '-Wno-self-assign'])
618
619 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
620
621 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
622 # opposed to libstdc++ to make the transition from TR1 to
623 # C++11. See http://libcxx.llvm.org. However, clang has chosen a
624 # strict implementation of the C++11 standard, and does not allow
625 # incomplete types in template arguments (besides unique_ptr and
626 # shared_ptr), and the libc++ STL containers create problems in
627 # combination with the current gem5 code. For now, we stick with
628 # libstdc++ and use the TR1 namespace.
629 # if sys.platform == "darwin":
630 # main.Append(CXXFLAGS=['-stdlib=libc++'])
631
632else:
633 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
634 print "Don't know what compiler options to use for your compiler."
635 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
636 print termcap.Yellow + ' version:' + termcap.Normal,
637 if not CXX_version:
638 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
639 termcap.Normal
640 else:
641 print CXX_version.replace('\n', '<nl>')
642 print " If you're trying to use a compiler other than GCC"
643 print " or clang, there appears to be something wrong with your"
644 print " environment."
645 print " "
646 print " If you are trying to use a compiler other than those listed"
647 print " above you will need to ease fix SConstruct and "
648 print " src/SConscript to support that compiler."
649 Exit(1)
650
651# Set up common yacc/bison flags (needed for Ruby)
652main['YACCFLAGS'] = '-d'
653main['YACCHXXFILESUFFIX'] = '.hh'
654
655# Do this after we save setting back, or else we'll tack on an
656# extra 'qdo' every time we run scons.
657if main['BATCH']:
658 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
659 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
660 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
661 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
662 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
663
664if sys.platform == 'cygwin':
665 # cygwin has some header file issues...
666 main.Append(CCFLAGS=["-Wno-uninitialized"])
667
668# Check for the protobuf compiler
669protoc_version = readCommand([main['PROTOC'], '--version'],
670 exception='').split()
671
672# First two words should be "libprotoc x.y.z"
673if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
674 print termcap.Yellow + termcap.Bold + \
675 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
676 ' Please install protobuf-compiler for tracing support.' + \
677 termcap.Normal
678 main['PROTOC'] = False
679else:
680 # Based on the availability of the compress stream wrappers,
681 # require 2.1.0
682 min_protoc_version = '2.1.0'
683 if compareVersions(protoc_version[1], min_protoc_version) < 0:
684 print termcap.Yellow + termcap.Bold + \
685 'Warning: protoc version', min_protoc_version, \
686 'or newer required.\n' + \
687 ' Installed version:', protoc_version[1], \
688 termcap.Normal
689 main['PROTOC'] = False
690 else:
691 # Attempt to determine the appropriate include path and
692 # library path using pkg-config, that means we also need to
693 # check for pkg-config. Note that it is possible to use
694 # protobuf without the involvement of pkg-config. Later on we
695 # check go a library config check and at that point the test
696 # will fail if libprotobuf cannot be found.
697 if readCommand(['pkg-config', '--version'], exception=''):
698 try:
699 # Attempt to establish what linking flags to add for protobuf
700 # using pkg-config
701 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
702 except:
703 print termcap.Yellow + termcap.Bold + \
704 'Warning: pkg-config could not get protobuf flags.' + \
705 termcap.Normal
706
707# Check for SWIG
708if not main.has_key('SWIG'):
709 print 'Error: SWIG utility not found.'
710 print ' Please install (see http://www.swig.org) and retry.'
711 Exit(1)
712
713# Check for appropriate SWIG version
714swig_version = readCommand([main['SWIG'], '-version'], exception='').split()
715# First 3 words should be "SWIG Version x.y.z"
716if len(swig_version) < 3 or \
717 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
718 print 'Error determining SWIG version.'
719 Exit(1)
720
721min_swig_version = '1.3.34'
722if compareVersions(swig_version[2], min_swig_version) < 0:
723 print 'Error: SWIG version', min_swig_version, 'or newer required.'
724 print ' Installed version:', swig_version[2]
725 Exit(1)
726
727if swig_version[2] in ["2.0.9", "2.0.10"]:
728 print '\n' + termcap.Yellow + termcap.Bold + \
729 'Warning: SWIG version 2.0.9/10 sometimes generates broken code.\n' + \
730 termcap.Normal + \
731 'This problem only affects some platforms and some Python\n' + \
732 'versions. See the following SWIG bug report for details:\n' + \
733 'http://sourceforge.net/p/swig/bugs/1297/\n'
734
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# Platform-specific configuration. Note again that we assume that all
788# builds under a given build root run on the same host platform.
789conf = Configure(main,
790 conf_dir = joinpath(build_root, '.scons_config'),
791 log_file = joinpath(build_root, 'scons_config.log'),
792 custom_tests = { 'CheckLeading' : CheckLeading })
793
794# Check for leading underscores. Don't really need to worry either
795# way so don't need to check the return code.
796conf.CheckLeading()
797
798# Check if we should compile a 64 bit binary on Mac OS X/Darwin
799try:
800 import platform
801 uname = platform.uname()
802 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
803 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
804 main.Append(CCFLAGS=['-arch', 'x86_64'])
805 main.Append(CFLAGS=['-arch', 'x86_64'])
806 main.Append(LINKFLAGS=['-arch', 'x86_64'])
807 main.Append(ASFLAGS=['-arch', 'x86_64'])
808except:
809 pass
810
811# Recent versions of scons substitute a "Null" object for Configure()
812# when configuration isn't necessary, e.g., if the "--help" option is
813# present. Unfortuantely this Null object always returns false,
814# breaking all our configuration checks. We replace it with our own
815# more optimistic null object that returns True instead.
816if not conf:
817 def NullCheck(*args, **kwargs):
818 return True
819
820 class NullConf:
821 def __init__(self, env):
822 self.env = env
823 def Finish(self):
824 return self.env
825 def __getattr__(self, mname):
826 return NullCheck
827
828 conf = NullConf(main)
829
830# Find Python include and library directories for embedding the
831# interpreter. For consistency, we will use the same Python
832# installation used to run scons (and thus this script). If you want
833# to link in an alternate version, see above for instructions on how
834# to invoke scons with a different copy of the Python interpreter.
835from distutils import sysconfig
836
837py_getvar = sysconfig.get_config_var
838
839py_debug = getattr(sys, 'pydebug', False)
840py_version = 'python' + py_getvar('VERSION') + (py_debug and "_d" or "")
841
842py_general_include = sysconfig.get_python_inc()
843py_platform_include = sysconfig.get_python_inc(plat_specific=True)
844py_includes = [ py_general_include ]
845if py_platform_include != py_general_include:
846 py_includes.append(py_platform_include)
847
848py_lib_path = [ py_getvar('LIBDIR') ]
849# add the prefix/lib/pythonX.Y/config dir, but only if there is no
850# shared library in prefix/lib/.
851if not py_getvar('Py_ENABLE_SHARED'):
852 py_lib_path.append(py_getvar('LIBPL'))
853 # Python requires the flags in LINKFORSHARED to be added the
854 # linker flags when linking with a statically with Python. Failing
855 # to do so can lead to errors from the Python's dynamic module
856 # loader at start up.
857 main.Append(LINKFLAGS=[py_getvar('LINKFORSHARED').split()])
858
859py_libs = []
860for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split():
861 if not lib.startswith('-l'):
862 # Python requires some special flags to link (e.g. -framework
863 # common on OS X systems), assume appending preserves order
864 main.Append(LINKFLAGS=[lib])
865 else:
866 lib = lib[2:]
867 if lib not in py_libs:
868 py_libs.append(lib)
869py_libs.append(py_version)
870
871main.Append(CPPPATH=py_includes)
872main.Append(LIBPATH=py_lib_path)
873
874# Cache build files in the supplied directory.
875if main['M5_BUILD_CACHE']:
876 print 'Using build cache located at', main['M5_BUILD_CACHE']
877 CacheDir(main['M5_BUILD_CACHE'])
878
879
880# verify that this stuff works
881if not conf.CheckHeader('Python.h', '<>'):
882 print "Error: can't find Python.h header in", py_includes
883 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
884 Exit(1)
885
886for lib in py_libs:
887 if not conf.CheckLib(lib):
888 print "Error: can't find library %s required by python" % lib
889 Exit(1)
890
891# On Solaris you need to use libsocket for socket ops
892if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
893 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
894 print "Can't find library with socket calls (e.g. accept())"
895 Exit(1)
896
897# Check for zlib. If the check passes, libz will be automatically
898# added to the LIBS environment variable.
899if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
900 print 'Error: did not find needed zlib compression library '\
901 'and/or zlib.h header file.'
902 print ' Please install zlib and try again.'
903 Exit(1)
904
905# If we have the protobuf compiler, also make sure we have the
906# development libraries. If the check passes, libprotobuf will be
907# automatically added to the LIBS environment variable. After
908# this, we can use the HAVE_PROTOBUF flag to determine if we have
909# got both protoc and libprotobuf available.
910main['HAVE_PROTOBUF'] = main['PROTOC'] and \
911 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
912 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
913
914# If we have the compiler but not the library, print another warning.
915if main['PROTOC'] and not main['HAVE_PROTOBUF']:
916 print termcap.Yellow + termcap.Bold + \
917 'Warning: did not find protocol buffer library and/or headers.\n' + \
918 ' Please install libprotobuf-dev for tracing support.' + \
919 termcap.Normal
920
921# Check for librt.
922have_posix_clock = \
923 conf.CheckLibWithHeader(None, 'time.h', 'C',
924 'clock_nanosleep(0,0,NULL,NULL);') or \
925 conf.CheckLibWithHeader('rt', 'time.h', 'C',
926 'clock_nanosleep(0,0,NULL,NULL);')
927
928if conf.CheckLib('tcmalloc'):
929 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
930elif conf.CheckLib('tcmalloc_minimal'):
931 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
932else:
933 print termcap.Yellow + termcap.Bold + \
934 "You can get a 12% performance improvement by installing tcmalloc "\
935 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \
936 termcap.Normal
937
938if not have_posix_clock:
939 print "Can't find library for POSIX clocks."
940
941# Check for <fenv.h> (C99 FP environment control)
942have_fenv = conf.CheckHeader('fenv.h', '<>')
943if not have_fenv:
944 print "Warning: Header file <fenv.h> not found."
945 print " This host has no IEEE FP rounding mode control."
946
947# Check if we should enable KVM-based hardware virtualization
948have_kvm = conf.CheckHeader('linux/kvm.h', '<>')
949if not have_kvm:
950 print "Info: Header file <linux/kvm.h> not found, " \
951 "disabling KVM support."
952
953# Check if the requested target ISA is compatible with the host
954def is_isa_kvm_compatible(isa):
955 isa_comp_table = {
956 "arm" : ( "armv7l" ),
957 }
958 try:
959 import platform
960 host_isa = platform.machine()
961 except:
962 print "Warning: Failed to determine host ISA."
963 return False
964
965 return host_isa in isa_comp_table.get(isa, [])
966
967
968######################################################################
969#
970# Finish the configuration
971#
972main = conf.Finish()
973
974######################################################################
975#
976# Collect all non-global variables
977#
978
979# Define the universe of supported ISAs
980all_isa_list = [ ]
981Export('all_isa_list')
982
983class CpuModel(object):
984 '''The CpuModel class encapsulates everything the ISA parser needs to
985 know about a particular CPU model.'''
986
987 # Dict of available CPU model objects. Accessible as CpuModel.dict.
988 dict = {}
989 list = []
990 defaults = []
991
992 # Constructor. Automatically adds models to CpuModel.dict.
993 def __init__(self, name, filename, includes, strings, default=False):
994 self.name = name # name of model
995 self.filename = filename # filename for output exec code
996 self.includes = includes # include files needed in exec file
997 # The 'strings' dict holds all the per-CPU symbols we can
998 # substitute into templates etc.
999 self.strings = strings
1000
1001 # This cpu is enabled by default
1002 self.default = default
1003
1004 # Add self to dict
1005 if name in CpuModel.dict:
1006 raise AttributeError, "CpuModel '%s' already registered" % name
1007 CpuModel.dict[name] = self
1008 CpuModel.list.append(name)
1009
1010Export('CpuModel')
1011
1012# Sticky variables get saved in the variables file so they persist from
1013# one invocation to the next (unless overridden, in which case the new
1014# value becomes sticky).
1015sticky_vars = Variables(args=ARGUMENTS)
1016Export('sticky_vars')
1017
1018# Sticky variables that should be exported
1019export_vars = []
1020Export('export_vars')
1021
1022# For Ruby
1023all_protocols = []
1024Export('all_protocols')
1025protocol_dirs = []
1026Export('protocol_dirs')
1027slicc_includes = []
1028Export('slicc_includes')
1029
1030# Walk the tree and execute all SConsopts scripts that wil add to the
1031# above variables
1032if not GetOption('verbose'):
1033 print "Reading SConsopts"
1034for bdir in [ base_dir ] + extras_dir_list:
1035 if not isdir(bdir):
1036 print "Error: directory '%s' does not exist" % bdir
1037 Exit(1)
1038 for root, dirs, files in os.walk(bdir):
1039 if 'SConsopts' in files:
1040 if GetOption('verbose'):
1041 print "Reading", joinpath(root, 'SConsopts')
1042 SConscript(joinpath(root, 'SConsopts'))
1043
1044all_isa_list.sort()
1045
1046sticky_vars.AddVariables(
1047 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
1048 ListVariable('CPU_MODELS', 'CPU models',
1049 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
1050 sorted(CpuModel.list)),
1051 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1052 False),
1053 BoolVariable('SS_COMPATIBLE_FP',
1054 'Make floating-point results compatible with SimpleScalar',
1055 False),
1056 BoolVariable('USE_SSE2',
1057 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1058 False),
1059 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
1060 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
1061 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1062 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
1063 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1064 all_protocols),
1065 )
1066
1067# These variables get exported to #defines in config/*.hh (see src/SConscript).
1068export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1069 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF']
1070
1071###################################################
1072#
1073# Define a SCons builder for configuration flag headers.
1074#
1075###################################################
1076
1077# This function generates a config header file that #defines the
1078# variable symbol to the current variable setting (0 or 1). The source
1079# operands are the name of the variable and a Value node containing the
1080# value of the variable.
1081def build_config_file(target, source, env):
1082 (variable, value) = [s.get_contents() for s in source]
1083 f = file(str(target[0]), 'w')
1084 print >> f, '#define', variable, value
1085 f.close()
1086 return None
1087
1088# Combine the two functions into a scons Action object.
1089config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))
1090
1091# The emitter munges the source & target node lists to reflect what
1092# we're really doing.
1093def config_emitter(target, source, env):
1094 # extract variable name from Builder arg
1095 variable = str(target[0])
1096 # True target is config header file
1097 target = joinpath('config', variable.lower() + '.hh')
1098 val = env[variable]
1099 if isinstance(val, bool):
1100 # Force value to 0/1
1101 val = int(val)
1102 elif isinstance(val, str):
1103 val = '"' + val + '"'
1104
1105 # Sources are variable name & value (packaged in SCons Value nodes)
1106 return ([target], [Value(variable), Value(val)])
1107
1108config_builder = Builder(emitter = config_emitter, action = config_action)
1109
1110main.Append(BUILDERS = { 'ConfigFile' : config_builder })
1111
1112# libelf build is shared across all configs in the build root.
1113main.SConscript('ext/libelf/SConscript',
1114 variant_dir = joinpath(build_root, 'libelf'))
1115
1116# gzstream build is shared across all configs in the build root.
1117main.SConscript('ext/gzstream/SConscript',
1118 variant_dir = joinpath(build_root, 'gzstream'))
1119
1120# libfdt build is shared across all configs in the build root.
1121main.SConscript('ext/libfdt/SConscript',
1122 variant_dir = joinpath(build_root, 'libfdt'))
1123
1124###################################################
1125#
1126# This function is used to set up a directory with switching headers
1127#
1128###################################################
1129
1130main['ALL_ISA_LIST'] = all_isa_list
1131def make_switching_dir(dname, switch_headers, env):
1132 # Generate the header. target[0] is the full path of the output
1133 # header to generate. 'source' is a dummy variable, since we get the
1134 # list of ISAs from env['ALL_ISA_LIST'].
1135 def gen_switch_hdr(target, source, env):
1136 fname = str(target[0])
1137 f = open(fname, 'w')
1138 isa = env['TARGET_ISA'].lower()
1139 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
1140 f.close()
1141
1142 # Build SCons Action object. 'varlist' specifies env vars that this
1143 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1144 # should get re-executed.
1145 switch_hdr_action = MakeAction(gen_switch_hdr,
1146 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
1147
1148 # Instantiate actions for each header
1149 for hdr in switch_headers:
1150 env.Command(hdr, [], switch_hdr_action)
1151Export('make_switching_dir')
1152
1153###################################################
1154#
1155# Define build environments for selected configurations.
1156#
1157###################################################
1158
1159for variant_path in variant_paths:
1160 print "Building in", variant_path
1161
1162 # Make a copy of the build-root environment to use for this config.
1163 env = main.Clone()
1164 env['BUILDDIR'] = variant_path
1165
1166 # variant_dir is the tail component of build path, and is used to
1167 # determine the build parameters (e.g., 'ALPHA_SE')
1168 (build_root, variant_dir) = splitpath(variant_path)
1169
1170 # Set env variables according to the build directory config.
1171 sticky_vars.files = []
1172 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1173 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1174 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1175 current_vars_file = joinpath(build_root, 'variables', variant_dir)
1176 if isfile(current_vars_file):
1177 sticky_vars.files.append(current_vars_file)
1178 print "Using saved variables file %s" % current_vars_file
1179 else:
1180 # Build dir-specific variables file doesn't exist.
1181
1182 # Make sure the directory is there so we can create it later
1183 opt_dir = dirname(current_vars_file)
1184 if not isdir(opt_dir):
1185 mkdir(opt_dir)
1186
1187 # Get default build variables from source tree. Variables are
1188 # normally determined by name of $VARIANT_DIR, but can be
1189 # overridden by '--default=' arg on command line.
1190 default = GetOption('default')
1191 opts_dir = joinpath(main.root.abspath, 'build_opts')
1192 if default:
1193 default_vars_files = [joinpath(build_root, 'variables', default),
1194 joinpath(opts_dir, default)]
1195 else:
1196 default_vars_files = [joinpath(opts_dir, variant_dir)]
1197 existing_files = filter(isfile, default_vars_files)
1198 if existing_files:
1199 default_vars_file = existing_files[0]
1200 sticky_vars.files.append(default_vars_file)
1201 print "Variables file %s not found,\n using defaults in %s" \
1202 % (current_vars_file, default_vars_file)
1203 else:
1204 print "Error: cannot find variables file %s or " \
1205 "default file(s) %s" \
1206 % (current_vars_file, ' or '.join(default_vars_files))
1207 Exit(1)
1208
1209 # Apply current variable settings to env
1210 sticky_vars.Update(env)
1211
1212 help_texts["local_vars"] += \
1213 "Build variables for %s:\n" % variant_dir \
1214 + sticky_vars.GenerateHelpText(env)
1215
1216 # Process variable settings.
1217
1218 if not have_fenv and env['USE_FENV']:
1219 print "Warning: <fenv.h> not available; " \
1220 "forcing USE_FENV to False in", variant_dir + "."
1221 env['USE_FENV'] = False
1222
1223 if not env['USE_FENV']:
1224 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
1225 print " FP results may deviate slightly from other platforms."
1226
1227 if env['EFENCE']:
1228 env.Append(LIBS=['efence'])
1229
1230 if env['USE_KVM']:
1231 if not have_kvm:
1232 print "Warning: Can not enable KVM, host seems to lack KVM support"
1233 env['USE_KVM'] = False
1234 elif not is_isa_kvm_compatible(env['TARGET_ISA']):
1235 print "Info: KVM support disabled due to unsupported host and " \
1236 "target ISA combination"
1237 env['USE_KVM'] = False
1238
1239 # Save sticky variable settings back to current variables file
1240 sticky_vars.Save(current_vars_file, env)
1241
1242 if env['USE_SSE2']:
1243 env.Append(CCFLAGS=['-msse2'])
1244
1245 # The src/SConscript file sets up the build rules in 'env' according
1246 # to the configured variables. It returns a list of environments,
1247 # one for each variant build (debug, opt, etc.)
1248 envList = SConscript('src/SConscript', variant_dir = variant_path,
1249 exports = 'env')
1250
1251 # Set up the regression tests for each build.
1252 for e in envList:
1253 SConscript('tests/SConscript',
1254 variant_dir = joinpath(variant_path, 'tests', e.Label),
1255 exports = { 'env' : e }, duplicate = False)
1256
1257# base help text
1258Help('''
1259Usage: scons [scons options] [build variables] [target(s)]
1260
1261Extra scons options:
1262%(options)s
1263
1264Global build variables:
1265%(global_vars)s
1266
1267%(local_vars)s
1268''' % help_texts)
2
3# Copyright (c) 2011 Advanced Micro Devices, Inc.
4# Copyright (c) 2009 The Hewlett-Packard Development Company
5# Copyright (c) 2004-2005 The Regents of The University of Michigan
6# All rights reserved.
7#
8# Redistribution and use in source and binary forms, with or without
9# modification, are permitted provided that the following conditions are
10# met: redistributions of source code must retain the above copyright
11# notice, this list of conditions and the following disclaimer;
12# redistributions in binary form must reproduce the above copyright
13# notice, this list of conditions and the following disclaimer in the
14# documentation and/or other materials provided with the distribution;
15# neither the name of the copyright holders nor the names of its
16# contributors may be used to endorse or promote products derived from
17# this software without specific prior written permission.
18#
19# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30#
31# Authors: Steve Reinhardt
32# Nathan Binkert
33
34###################################################
35#
36# SCons top-level build description (SConstruct) file.
37#
38# While in this directory ('gem5'), just type 'scons' to build the default
39# configuration (see below), or type 'scons build/<CONFIG>/<binary>'
40# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for
41# the optimized full-system version).
42#
43# You can build gem5 in a different directory as long as there is a
44# 'build/<CONFIG>' somewhere along the target path. The build system
45# expects that all configs under the same build directory are being
46# built for the same host system.
47#
48# Examples:
49#
50# The following two commands are equivalent. The '-u' option tells
51# scons to search up the directory tree for this SConstruct file.
52# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug
53# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug
54#
55# The following two commands are equivalent and demonstrate building
56# in a directory outside of the source tree. The '-C' option tells
57# scons to chdir to the specified directory to find this SConstruct
58# file.
59# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug
60# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug
61#
62# You can use 'scons -H' to print scons options. If you're in this
63# 'gem5' directory (or use -u or -C to tell scons where to find this
64# file), you can use 'scons -h' to print all the gem5-specific build
65# options as well.
66#
67###################################################
68
69# Check for recent-enough Python and SCons versions.
70try:
71 # Really old versions of scons only take two options for the
72 # function, so check once without the revision and once with the
73 # revision, the first instance will fail for stuff other than
74 # 0.98, and the second will fail for 0.98.0
75 EnsureSConsVersion(0, 98)
76 EnsureSConsVersion(0, 98, 1)
77except SystemExit, e:
78 print """
79For more details, see:
80 http://gem5.org/Dependencies
81"""
82 raise
83
84# We ensure the python version early because we have stuff that
85# requires python 2.4
86try:
87 EnsurePythonVersion(2, 4)
88except SystemExit, e:
89 print """
90You can use a non-default installation of the Python interpreter by
91either (1) rearranging your PATH so that scons finds the non-default
92'python' first or (2) explicitly invoking an alternative interpreter
93on the scons script.
94
95For more details, see:
96 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation
97"""
98 raise
99
100# Global Python includes
101import os
102import re
103import subprocess
104import sys
105
106from os import mkdir, environ
107from os.path import abspath, basename, dirname, expanduser, normpath
108from os.path import exists, isdir, isfile
109from os.path import join as joinpath, split as splitpath
110
111# SCons includes
112import SCons
113import SCons.Node
114
115extra_python_paths = [
116 Dir('src/python').srcnode().abspath, # gem5 includes
117 Dir('ext/ply').srcnode().abspath, # ply is used by several files
118 ]
119
120sys.path[1:1] = extra_python_paths
121
122from m5.util import compareVersions, readCommand
123from m5.util.terminal import get_termcap
124
125help_texts = {
126 "options" : "",
127 "global_vars" : "",
128 "local_vars" : ""
129}
130
131Export("help_texts")
132
133
134# There's a bug in scons in that (1) by default, the help texts from
135# AddOption() are supposed to be displayed when you type 'scons -h'
136# and (2) you can override the help displayed by 'scons -h' using the
137# Help() function, but these two features are incompatible: once
138# you've overridden the help text using Help(), there's no way to get
139# at the help texts from AddOptions. See:
140# http://scons.tigris.org/issues/show_bug.cgi?id=2356
141# http://scons.tigris.org/issues/show_bug.cgi?id=2611
142# This hack lets us extract the help text from AddOptions and
143# re-inject it via Help(). Ideally someday this bug will be fixed and
144# we can just use AddOption directly.
145def AddLocalOption(*args, **kwargs):
146 col_width = 30
147
148 help = " " + ", ".join(args)
149 if "help" in kwargs:
150 length = len(help)
151 if length >= col_width:
152 help += "\n" + " " * col_width
153 else:
154 help += " " * (col_width - length)
155 help += kwargs["help"]
156 help_texts["options"] += help + "\n"
157
158 AddOption(*args, **kwargs)
159
160AddLocalOption('--colors', dest='use_colors', action='store_true',
161 help="Add color to abbreviated scons output")
162AddLocalOption('--no-colors', dest='use_colors', action='store_false',
163 help="Don't add color to abbreviated scons output")
164AddLocalOption('--default', dest='default', type='string', action='store',
165 help='Override which build_opts file to use for defaults')
166AddLocalOption('--ignore-style', dest='ignore_style', action='store_true',
167 help='Disable style checking hooks')
168AddLocalOption('--no-lto', dest='no_lto', action='store_true',
169 help='Disable Link-Time Optimization for fast')
170AddLocalOption('--update-ref', dest='update_ref', action='store_true',
171 help='Update test reference outputs')
172AddLocalOption('--verbose', dest='verbose', action='store_true',
173 help='Print full tool command lines')
174
175termcap = get_termcap(GetOption('use_colors'))
176
177########################################################################
178#
179# Set up the main build environment.
180#
181########################################################################
182use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
183 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PYTHONPATH',
184 'RANLIB', 'SWIG' ])
185
186use_prefixes = [
187 "M5", # M5 configuration (e.g., path to kernels)
188 "DISTCC_", # distcc (distributed compiler wrapper) configuration
189 "CCACHE_", # ccache (caching compiler wrapper) configuration
190 "CCC_", # clang static analyzer configuration
191 ]
192
193use_env = {}
194for key,val in os.environ.iteritems():
195 if key in use_vars or \
196 any([key.startswith(prefix) for prefix in use_prefixes]):
197 use_env[key] = val
198
199main = Environment(ENV=use_env)
200main.Decider('MD5-timestamp')
201main.root = Dir(".") # The current directory (where this file lives).
202main.srcdir = Dir("src") # The source directory
203
204main_dict_keys = main.Dictionary().keys()
205
206# Check that we have a C/C++ compiler
207if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys):
208 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
209 Exit(1)
210
211# Check that swig is present
212if not 'SWIG' in main_dict_keys:
213 print "swig is not installed (package swig on Ubuntu and RedHat)"
214 Exit(1)
215
216# add useful python code PYTHONPATH so it can be used by subprocesses
217# as well
218main.AppendENVPath('PYTHONPATH', extra_python_paths)
219
220########################################################################
221#
222# Mercurial Stuff.
223#
224# If the gem5 directory is a mercurial repository, we should do some
225# extra things.
226#
227########################################################################
228
229hgdir = main.root.Dir(".hg")
230
231mercurial_style_message = """
232You're missing the gem5 style hook, which automatically checks your code
233against the gem5 style rules on hg commit and qrefresh commands. This
234script will now install the hook in your .hg/hgrc file.
235Press enter to continue, or ctrl-c to abort: """
236
237mercurial_style_hook = """
238# The following lines were automatically added by gem5/SConstruct
239# to provide the gem5 style-checking hooks
240[extensions]
241style = %s/util/style.py
242
243[hooks]
244pretxncommit.style = python:style.check_style
245pre-qrefresh.style = python:style.check_style
246# End of SConstruct additions
247
248""" % (main.root.abspath)
249
250mercurial_lib_not_found = """
251Mercurial libraries cannot be found, ignoring style hook. If
252you are a gem5 developer, please fix this and run the style
253hook. It is important.
254"""
255
256# Check for style hook and prompt for installation if it's not there.
257# Skip this if --ignore-style was specified, there's no .hg dir to
258# install a hook in, or there's no interactive terminal to prompt.
259if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
260 style_hook = True
261 try:
262 from mercurial import ui
263 ui = ui.ui()
264 ui.readconfig(hgdir.File('hgrc').abspath)
265 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
266 ui.config('hooks', 'pre-qrefresh.style', None)
267 except ImportError:
268 print mercurial_lib_not_found
269
270 if not style_hook:
271 print mercurial_style_message,
272 # continue unless user does ctrl-c/ctrl-d etc.
273 try:
274 raw_input()
275 except:
276 print "Input exception, exiting scons.\n"
277 sys.exit(1)
278 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
279 print "Adding style hook to", hgrc_path, "\n"
280 try:
281 hgrc = open(hgrc_path, 'a')
282 hgrc.write(mercurial_style_hook)
283 hgrc.close()
284 except:
285 print "Error updating", hgrc_path
286 sys.exit(1)
287
288
289###################################################
290#
291# Figure out which configurations to set up based on the path(s) of
292# the target(s).
293#
294###################################################
295
296# Find default configuration & binary.
297Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
298
299# helper function: find last occurrence of element in list
300def rfind(l, elt, offs = -1):
301 for i in range(len(l)+offs, 0, -1):
302 if l[i] == elt:
303 return i
304 raise ValueError, "element not found"
305
306# Take a list of paths (or SCons Nodes) and return a list with all
307# paths made absolute and ~-expanded. Paths will be interpreted
308# relative to the launch directory unless a different root is provided
309def makePathListAbsolute(path_list, root=GetLaunchDir()):
310 return [abspath(joinpath(root, expanduser(str(p))))
311 for p in path_list]
312
313# Each target must have 'build' in the interior of the path; the
314# directory below this will determine the build parameters. For
315# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
316# recognize that ALPHA_SE specifies the configuration because it
317# follow 'build' in the build path.
318
319# The funky assignment to "[:]" is needed to replace the list contents
320# in place rather than reassign the symbol to a new list, which
321# doesn't work (obviously!).
322BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
323
324# Generate a list of the unique build roots and configs that the
325# collected targets reference.
326variant_paths = []
327build_root = None
328for t in BUILD_TARGETS:
329 path_dirs = t.split('/')
330 try:
331 build_top = rfind(path_dirs, 'build', -2)
332 except:
333 print "Error: no non-leaf 'build' dir found on target path", t
334 Exit(1)
335 this_build_root = joinpath('/',*path_dirs[:build_top+1])
336 if not build_root:
337 build_root = this_build_root
338 else:
339 if this_build_root != build_root:
340 print "Error: build targets not under same build root\n"\
341 " %s\n %s" % (build_root, this_build_root)
342 Exit(1)
343 variant_path = joinpath('/',*path_dirs[:build_top+2])
344 if variant_path not in variant_paths:
345 variant_paths.append(variant_path)
346
347# Make sure build_root exists (might not if this is the first build there)
348if not isdir(build_root):
349 mkdir(build_root)
350main['BUILDROOT'] = build_root
351
352Export('main')
353
354main.SConsignFile(joinpath(build_root, "sconsign"))
355
356# Default duplicate option is to use hard links, but this messes up
357# when you use emacs to edit a file in the target dir, as emacs moves
358# file to file~ then copies to file, breaking the link. Symbolic
359# (soft) links work better.
360main.SetOption('duplicate', 'soft-copy')
361
362#
363# Set up global sticky variables... these are common to an entire build
364# tree (not specific to a particular build like ALPHA_SE)
365#
366
367global_vars_file = joinpath(build_root, 'variables.global')
368
369global_vars = Variables(global_vars_file, args=ARGUMENTS)
370
371global_vars.AddVariables(
372 ('CC', 'C compiler', environ.get('CC', main['CC'])),
373 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
374 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])),
375 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')),
376 ('BATCH', 'Use batch pool for build and tests', False),
377 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
378 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
379 ('EXTRAS', 'Add extra directories to the compilation', '')
380 )
381
382# Update main environment with values from ARGUMENTS & global_vars_file
383global_vars.Update(main)
384help_texts["global_vars"] += global_vars.GenerateHelpText(main)
385
386# Save sticky variable settings back to current variables file
387global_vars.Save(global_vars_file, main)
388
389# Parse EXTRAS variable to build list of all directories where we're
390# look for sources etc. This list is exported as extras_dir_list.
391base_dir = main.srcdir.abspath
392if main['EXTRAS']:
393 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
394else:
395 extras_dir_list = []
396
397Export('base_dir')
398Export('extras_dir_list')
399
400# the ext directory should be on the #includes path
401main.Append(CPPPATH=[Dir('ext')])
402
403def strip_build_path(path, env):
404 path = str(path)
405 variant_base = env['BUILDROOT'] + os.path.sep
406 if path.startswith(variant_base):
407 path = path[len(variant_base):]
408 elif path.startswith('build/'):
409 path = path[6:]
410 return path
411
412# Generate a string of the form:
413# common/path/prefix/src1, src2 -> tgt1, tgt2
414# to print while building.
415class Transform(object):
416 # all specific color settings should be here and nowhere else
417 tool_color = termcap.Normal
418 pfx_color = termcap.Yellow
419 srcs_color = termcap.Yellow + termcap.Bold
420 arrow_color = termcap.Blue + termcap.Bold
421 tgts_color = termcap.Yellow + termcap.Bold
422
423 def __init__(self, tool, max_sources=99):
424 self.format = self.tool_color + (" [%8s] " % tool) \
425 + self.pfx_color + "%s" \
426 + self.srcs_color + "%s" \
427 + self.arrow_color + " -> " \
428 + self.tgts_color + "%s" \
429 + termcap.Normal
430 self.max_sources = max_sources
431
432 def __call__(self, target, source, env, for_signature=None):
433 # truncate source list according to max_sources param
434 source = source[0:self.max_sources]
435 def strip(f):
436 return strip_build_path(str(f), env)
437 if len(source) > 0:
438 srcs = map(strip, source)
439 else:
440 srcs = ['']
441 tgts = map(strip, target)
442 # surprisingly, os.path.commonprefix is a dumb char-by-char string
443 # operation that has nothing to do with paths.
444 com_pfx = os.path.commonprefix(srcs + tgts)
445 com_pfx_len = len(com_pfx)
446 if com_pfx:
447 # do some cleanup and sanity checking on common prefix
448 if com_pfx[-1] == ".":
449 # prefix matches all but file extension: ok
450 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
451 com_pfx = com_pfx[0:-1]
452 elif com_pfx[-1] == "/":
453 # common prefix is directory path: OK
454 pass
455 else:
456 src0_len = len(srcs[0])
457 tgt0_len = len(tgts[0])
458 if src0_len == com_pfx_len:
459 # source is a substring of target, OK
460 pass
461 elif tgt0_len == com_pfx_len:
462 # target is a substring of source, need to back up to
463 # avoid empty string on RHS of arrow
464 sep_idx = com_pfx.rfind(".")
465 if sep_idx != -1:
466 com_pfx = com_pfx[0:sep_idx]
467 else:
468 com_pfx = ''
469 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
470 # still splitting at file extension: ok
471 pass
472 else:
473 # probably a fluke; ignore it
474 com_pfx = ''
475 # recalculate length in case com_pfx was modified
476 com_pfx_len = len(com_pfx)
477 def fmt(files):
478 f = map(lambda s: s[com_pfx_len:], files)
479 return ', '.join(f)
480 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
481
482Export('Transform')
483
484# enable the regression script to use the termcap
485main['TERMCAP'] = termcap
486
487if GetOption('verbose'):
488 def MakeAction(action, string, *args, **kwargs):
489 return Action(action, *args, **kwargs)
490else:
491 MakeAction = Action
492 main['CCCOMSTR'] = Transform("CC")
493 main['CXXCOMSTR'] = Transform("CXX")
494 main['ASCOMSTR'] = Transform("AS")
495 main['SWIGCOMSTR'] = Transform("SWIG")
496 main['ARCOMSTR'] = Transform("AR", 0)
497 main['LINKCOMSTR'] = Transform("LINK", 0)
498 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
499 main['M4COMSTR'] = Transform("M4")
500 main['SHCCCOMSTR'] = Transform("SHCC")
501 main['SHCXXCOMSTR'] = Transform("SHCXX")
502Export('MakeAction')
503
504# Initialize the Link-Time Optimization (LTO) flags
505main['LTO_CCFLAGS'] = []
506main['LTO_LDFLAGS'] = []
507
508# According to the readme, tcmalloc works best if the compiler doesn't
509# assume that we're using the builtin malloc and friends. These flags
510# are compiler-specific, so we need to set them after we detect which
511# compiler we're using.
512main['TCMALLOC_CCFLAGS'] = []
513
514CXX_version = readCommand([main['CXX'],'--version'], exception=False)
515CXX_V = readCommand([main['CXX'],'-V'], exception=False)
516
517main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
518main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0
519if main['GCC'] + main['CLANG'] > 1:
520 print 'Error: How can we have two at the same time?'
521 Exit(1)
522
523# Set up default C++ compiler flags
524if main['GCC'] or main['CLANG']:
525 # As gcc and clang share many flags, do the common parts here
526 main.Append(CCFLAGS=['-pipe'])
527 main.Append(CCFLAGS=['-fno-strict-aliasing'])
528 # Enable -Wall and then disable the few warnings that we
529 # consistently violate
530 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
531 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
532 # actually use that name, so we stick with c++0x
533 main.Append(CXXFLAGS=['-std=c++0x'])
534 # Add selected sanity checks from -Wextra
535 main.Append(CXXFLAGS=['-Wmissing-field-initializers',
536 '-Woverloaded-virtual'])
537else:
538 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
539 print "Don't know what compiler options to use for your compiler."
540 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
541 print termcap.Yellow + ' version:' + termcap.Normal,
542 if not CXX_version:
543 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
544 termcap.Normal
545 else:
546 print CXX_version.replace('\n', '<nl>')
547 print " If you're trying to use a compiler other than GCC"
548 print " or clang, there appears to be something wrong with your"
549 print " environment."
550 print " "
551 print " If you are trying to use a compiler other than those listed"
552 print " above you will need to ease fix SConstruct and "
553 print " src/SConscript to support that compiler."
554 Exit(1)
555
556if main['GCC']:
557 # Check for a supported version of gcc, >= 4.4 is needed for c++0x
558 # support. See http://gcc.gnu.org/projects/cxx0x.html for details
559 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
560 if compareVersions(gcc_version, "4.4") < 0:
561 print 'Error: gcc version 4.4 or newer required.'
562 print ' Installed version:', gcc_version
563 Exit(1)
564
565 main['GCC_VERSION'] = gcc_version
566
567 # Check for versions with bugs
568 if not compareVersions(gcc_version, '4.4.1') or \
569 not compareVersions(gcc_version, '4.4.2'):
570 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
571 main.Append(CCFLAGS=['-fno-tree-vectorize'])
572
573 # LTO support is only really working properly from 4.6 and beyond
574 if compareVersions(gcc_version, '4.6') >= 0:
575 # Add the appropriate Link-Time Optimization (LTO) flags
576 # unless LTO is explicitly turned off. Note that these flags
577 # are only used by the fast target.
578 if not GetOption('no_lto'):
579 # Pass the LTO flag when compiling to produce GIMPLE
580 # output, we merely create the flags here and only append
581 # them later/
582 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
583
584 # Use the same amount of jobs for LTO as we are running
585 # scons with, we hardcode the use of the linker plugin
586 # which requires either gold or GNU ld >= 2.21
587 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
588 '-fuse-linker-plugin']
589
590 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc',
591 '-fno-builtin-realloc', '-fno-builtin-free'])
592
593elif main['CLANG']:
594 # Check for a supported version of clang, >= 2.9 is needed to
595 # support similar features as gcc 4.4. See
596 # http://clang.llvm.org/cxx_status.html for details
597 clang_version_re = re.compile(".* version (\d+\.\d+)")
598 clang_version_match = clang_version_re.match(CXX_version)
599 if (clang_version_match):
600 clang_version = clang_version_match.groups()[0]
601 if compareVersions(clang_version, "2.9") < 0:
602 print 'Error: clang version 2.9 or newer required.'
603 print ' Installed version:', clang_version
604 Exit(1)
605 else:
606 print 'Error: Unable to determine clang version.'
607 Exit(1)
608
609 # clang has a few additional warnings that we disable,
610 # tautological comparisons are allowed due to unsigned integers
611 # being compared to constants that happen to be 0, and extraneous
612 # parantheses are allowed due to Ruby's printing of the AST,
613 # finally self assignments are allowed as the generated CPU code
614 # is relying on this
615 main.Append(CCFLAGS=['-Wno-tautological-compare',
616 '-Wno-parentheses',
617 '-Wno-self-assign'])
618
619 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
620
621 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
622 # opposed to libstdc++ to make the transition from TR1 to
623 # C++11. See http://libcxx.llvm.org. However, clang has chosen a
624 # strict implementation of the C++11 standard, and does not allow
625 # incomplete types in template arguments (besides unique_ptr and
626 # shared_ptr), and the libc++ STL containers create problems in
627 # combination with the current gem5 code. For now, we stick with
628 # libstdc++ and use the TR1 namespace.
629 # if sys.platform == "darwin":
630 # main.Append(CXXFLAGS=['-stdlib=libc++'])
631
632else:
633 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
634 print "Don't know what compiler options to use for your compiler."
635 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']
636 print termcap.Yellow + ' version:' + termcap.Normal,
637 if not CXX_version:
638 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\
639 termcap.Normal
640 else:
641 print CXX_version.replace('\n', '<nl>')
642 print " If you're trying to use a compiler other than GCC"
643 print " or clang, there appears to be something wrong with your"
644 print " environment."
645 print " "
646 print " If you are trying to use a compiler other than those listed"
647 print " above you will need to ease fix SConstruct and "
648 print " src/SConscript to support that compiler."
649 Exit(1)
650
651# Set up common yacc/bison flags (needed for Ruby)
652main['YACCFLAGS'] = '-d'
653main['YACCHXXFILESUFFIX'] = '.hh'
654
655# Do this after we save setting back, or else we'll tack on an
656# extra 'qdo' every time we run scons.
657if main['BATCH']:
658 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
659 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
660 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
661 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
662 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
663
664if sys.platform == 'cygwin':
665 # cygwin has some header file issues...
666 main.Append(CCFLAGS=["-Wno-uninitialized"])
667
668# Check for the protobuf compiler
669protoc_version = readCommand([main['PROTOC'], '--version'],
670 exception='').split()
671
672# First two words should be "libprotoc x.y.z"
673if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc':
674 print termcap.Yellow + termcap.Bold + \
675 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
676 ' Please install protobuf-compiler for tracing support.' + \
677 termcap.Normal
678 main['PROTOC'] = False
679else:
680 # Based on the availability of the compress stream wrappers,
681 # require 2.1.0
682 min_protoc_version = '2.1.0'
683 if compareVersions(protoc_version[1], min_protoc_version) < 0:
684 print termcap.Yellow + termcap.Bold + \
685 'Warning: protoc version', min_protoc_version, \
686 'or newer required.\n' + \
687 ' Installed version:', protoc_version[1], \
688 termcap.Normal
689 main['PROTOC'] = False
690 else:
691 # Attempt to determine the appropriate include path and
692 # library path using pkg-config, that means we also need to
693 # check for pkg-config. Note that it is possible to use
694 # protobuf without the involvement of pkg-config. Later on we
695 # check go a library config check and at that point the test
696 # will fail if libprotobuf cannot be found.
697 if readCommand(['pkg-config', '--version'], exception=''):
698 try:
699 # Attempt to establish what linking flags to add for protobuf
700 # using pkg-config
701 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
702 except:
703 print termcap.Yellow + termcap.Bold + \
704 'Warning: pkg-config could not get protobuf flags.' + \
705 termcap.Normal
706
707# Check for SWIG
708if not main.has_key('SWIG'):
709 print 'Error: SWIG utility not found.'
710 print ' Please install (see http://www.swig.org) and retry.'
711 Exit(1)
712
713# Check for appropriate SWIG version
714swig_version = readCommand([main['SWIG'], '-version'], exception='').split()
715# First 3 words should be "SWIG Version x.y.z"
716if len(swig_version) < 3 or \
717 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
718 print 'Error determining SWIG version.'
719 Exit(1)
720
721min_swig_version = '1.3.34'
722if compareVersions(swig_version[2], min_swig_version) < 0:
723 print 'Error: SWIG version', min_swig_version, 'or newer required.'
724 print ' Installed version:', swig_version[2]
725 Exit(1)
726
727if swig_version[2] in ["2.0.9", "2.0.10"]:
728 print '\n' + termcap.Yellow + termcap.Bold + \
729 'Warning: SWIG version 2.0.9/10 sometimes generates broken code.\n' + \
730 termcap.Normal + \
731 'This problem only affects some platforms and some Python\n' + \
732 'versions. See the following SWIG bug report for details:\n' + \
733 'http://sourceforge.net/p/swig/bugs/1297/\n'
734
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# Platform-specific configuration. Note again that we assume that all
788# builds under a given build root run on the same host platform.
789conf = Configure(main,
790 conf_dir = joinpath(build_root, '.scons_config'),
791 log_file = joinpath(build_root, 'scons_config.log'),
792 custom_tests = { 'CheckLeading' : CheckLeading })
793
794# Check for leading underscores. Don't really need to worry either
795# way so don't need to check the return code.
796conf.CheckLeading()
797
798# Check if we should compile a 64 bit binary on Mac OS X/Darwin
799try:
800 import platform
801 uname = platform.uname()
802 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
803 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
804 main.Append(CCFLAGS=['-arch', 'x86_64'])
805 main.Append(CFLAGS=['-arch', 'x86_64'])
806 main.Append(LINKFLAGS=['-arch', 'x86_64'])
807 main.Append(ASFLAGS=['-arch', 'x86_64'])
808except:
809 pass
810
811# Recent versions of scons substitute a "Null" object for Configure()
812# when configuration isn't necessary, e.g., if the "--help" option is
813# present. Unfortuantely this Null object always returns false,
814# breaking all our configuration checks. We replace it with our own
815# more optimistic null object that returns True instead.
816if not conf:
817 def NullCheck(*args, **kwargs):
818 return True
819
820 class NullConf:
821 def __init__(self, env):
822 self.env = env
823 def Finish(self):
824 return self.env
825 def __getattr__(self, mname):
826 return NullCheck
827
828 conf = NullConf(main)
829
830# Find Python include and library directories for embedding the
831# interpreter. For consistency, we will use the same Python
832# installation used to run scons (and thus this script). If you want
833# to link in an alternate version, see above for instructions on how
834# to invoke scons with a different copy of the Python interpreter.
835from distutils import sysconfig
836
837py_getvar = sysconfig.get_config_var
838
839py_debug = getattr(sys, 'pydebug', False)
840py_version = 'python' + py_getvar('VERSION') + (py_debug and "_d" or "")
841
842py_general_include = sysconfig.get_python_inc()
843py_platform_include = sysconfig.get_python_inc(plat_specific=True)
844py_includes = [ py_general_include ]
845if py_platform_include != py_general_include:
846 py_includes.append(py_platform_include)
847
848py_lib_path = [ py_getvar('LIBDIR') ]
849# add the prefix/lib/pythonX.Y/config dir, but only if there is no
850# shared library in prefix/lib/.
851if not py_getvar('Py_ENABLE_SHARED'):
852 py_lib_path.append(py_getvar('LIBPL'))
853 # Python requires the flags in LINKFORSHARED to be added the
854 # linker flags when linking with a statically with Python. Failing
855 # to do so can lead to errors from the Python's dynamic module
856 # loader at start up.
857 main.Append(LINKFLAGS=[py_getvar('LINKFORSHARED').split()])
858
859py_libs = []
860for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split():
861 if not lib.startswith('-l'):
862 # Python requires some special flags to link (e.g. -framework
863 # common on OS X systems), assume appending preserves order
864 main.Append(LINKFLAGS=[lib])
865 else:
866 lib = lib[2:]
867 if lib not in py_libs:
868 py_libs.append(lib)
869py_libs.append(py_version)
870
871main.Append(CPPPATH=py_includes)
872main.Append(LIBPATH=py_lib_path)
873
874# Cache build files in the supplied directory.
875if main['M5_BUILD_CACHE']:
876 print 'Using build cache located at', main['M5_BUILD_CACHE']
877 CacheDir(main['M5_BUILD_CACHE'])
878
879
880# verify that this stuff works
881if not conf.CheckHeader('Python.h', '<>'):
882 print "Error: can't find Python.h header in", py_includes
883 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
884 Exit(1)
885
886for lib in py_libs:
887 if not conf.CheckLib(lib):
888 print "Error: can't find library %s required by python" % lib
889 Exit(1)
890
891# On Solaris you need to use libsocket for socket ops
892if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
893 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
894 print "Can't find library with socket calls (e.g. accept())"
895 Exit(1)
896
897# Check for zlib. If the check passes, libz will be automatically
898# added to the LIBS environment variable.
899if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
900 print 'Error: did not find needed zlib compression library '\
901 'and/or zlib.h header file.'
902 print ' Please install zlib and try again.'
903 Exit(1)
904
905# If we have the protobuf compiler, also make sure we have the
906# development libraries. If the check passes, libprotobuf will be
907# automatically added to the LIBS environment variable. After
908# this, we can use the HAVE_PROTOBUF flag to determine if we have
909# got both protoc and libprotobuf available.
910main['HAVE_PROTOBUF'] = main['PROTOC'] and \
911 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
912 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
913
914# If we have the compiler but not the library, print another warning.
915if main['PROTOC'] and not main['HAVE_PROTOBUF']:
916 print termcap.Yellow + termcap.Bold + \
917 'Warning: did not find protocol buffer library and/or headers.\n' + \
918 ' Please install libprotobuf-dev for tracing support.' + \
919 termcap.Normal
920
921# Check for librt.
922have_posix_clock = \
923 conf.CheckLibWithHeader(None, 'time.h', 'C',
924 'clock_nanosleep(0,0,NULL,NULL);') or \
925 conf.CheckLibWithHeader('rt', 'time.h', 'C',
926 'clock_nanosleep(0,0,NULL,NULL);')
927
928if conf.CheckLib('tcmalloc'):
929 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
930elif conf.CheckLib('tcmalloc_minimal'):
931 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
932else:
933 print termcap.Yellow + termcap.Bold + \
934 "You can get a 12% performance improvement by installing tcmalloc "\
935 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \
936 termcap.Normal
937
938if not have_posix_clock:
939 print "Can't find library for POSIX clocks."
940
941# Check for <fenv.h> (C99 FP environment control)
942have_fenv = conf.CheckHeader('fenv.h', '<>')
943if not have_fenv:
944 print "Warning: Header file <fenv.h> not found."
945 print " This host has no IEEE FP rounding mode control."
946
947# Check if we should enable KVM-based hardware virtualization
948have_kvm = conf.CheckHeader('linux/kvm.h', '<>')
949if not have_kvm:
950 print "Info: Header file <linux/kvm.h> not found, " \
951 "disabling KVM support."
952
953# Check if the requested target ISA is compatible with the host
954def is_isa_kvm_compatible(isa):
955 isa_comp_table = {
956 "arm" : ( "armv7l" ),
957 }
958 try:
959 import platform
960 host_isa = platform.machine()
961 except:
962 print "Warning: Failed to determine host ISA."
963 return False
964
965 return host_isa in isa_comp_table.get(isa, [])
966
967
968######################################################################
969#
970# Finish the configuration
971#
972main = conf.Finish()
973
974######################################################################
975#
976# Collect all non-global variables
977#
978
979# Define the universe of supported ISAs
980all_isa_list = [ ]
981Export('all_isa_list')
982
983class CpuModel(object):
984 '''The CpuModel class encapsulates everything the ISA parser needs to
985 know about a particular CPU model.'''
986
987 # Dict of available CPU model objects. Accessible as CpuModel.dict.
988 dict = {}
989 list = []
990 defaults = []
991
992 # Constructor. Automatically adds models to CpuModel.dict.
993 def __init__(self, name, filename, includes, strings, default=False):
994 self.name = name # name of model
995 self.filename = filename # filename for output exec code
996 self.includes = includes # include files needed in exec file
997 # The 'strings' dict holds all the per-CPU symbols we can
998 # substitute into templates etc.
999 self.strings = strings
1000
1001 # This cpu is enabled by default
1002 self.default = default
1003
1004 # Add self to dict
1005 if name in CpuModel.dict:
1006 raise AttributeError, "CpuModel '%s' already registered" % name
1007 CpuModel.dict[name] = self
1008 CpuModel.list.append(name)
1009
1010Export('CpuModel')
1011
1012# Sticky variables get saved in the variables file so they persist from
1013# one invocation to the next (unless overridden, in which case the new
1014# value becomes sticky).
1015sticky_vars = Variables(args=ARGUMENTS)
1016Export('sticky_vars')
1017
1018# Sticky variables that should be exported
1019export_vars = []
1020Export('export_vars')
1021
1022# For Ruby
1023all_protocols = []
1024Export('all_protocols')
1025protocol_dirs = []
1026Export('protocol_dirs')
1027slicc_includes = []
1028Export('slicc_includes')
1029
1030# Walk the tree and execute all SConsopts scripts that wil add to the
1031# above variables
1032if not GetOption('verbose'):
1033 print "Reading SConsopts"
1034for bdir in [ base_dir ] + extras_dir_list:
1035 if not isdir(bdir):
1036 print "Error: directory '%s' does not exist" % bdir
1037 Exit(1)
1038 for root, dirs, files in os.walk(bdir):
1039 if 'SConsopts' in files:
1040 if GetOption('verbose'):
1041 print "Reading", joinpath(root, 'SConsopts')
1042 SConscript(joinpath(root, 'SConsopts'))
1043
1044all_isa_list.sort()
1045
1046sticky_vars.AddVariables(
1047 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
1048 ListVariable('CPU_MODELS', 'CPU models',
1049 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
1050 sorted(CpuModel.list)),
1051 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1052 False),
1053 BoolVariable('SS_COMPATIBLE_FP',
1054 'Make floating-point results compatible with SimpleScalar',
1055 False),
1056 BoolVariable('USE_SSE2',
1057 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1058 False),
1059 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
1060 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
1061 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1062 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
1063 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1064 all_protocols),
1065 )
1066
1067# These variables get exported to #defines in config/*.hh (see src/SConscript).
1068export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1069 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF']
1070
1071###################################################
1072#
1073# Define a SCons builder for configuration flag headers.
1074#
1075###################################################
1076
1077# This function generates a config header file that #defines the
1078# variable symbol to the current variable setting (0 or 1). The source
1079# operands are the name of the variable and a Value node containing the
1080# value of the variable.
1081def build_config_file(target, source, env):
1082 (variable, value) = [s.get_contents() for s in source]
1083 f = file(str(target[0]), 'w')
1084 print >> f, '#define', variable, value
1085 f.close()
1086 return None
1087
1088# Combine the two functions into a scons Action object.
1089config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))
1090
1091# The emitter munges the source & target node lists to reflect what
1092# we're really doing.
1093def config_emitter(target, source, env):
1094 # extract variable name from Builder arg
1095 variable = str(target[0])
1096 # True target is config header file
1097 target = joinpath('config', variable.lower() + '.hh')
1098 val = env[variable]
1099 if isinstance(val, bool):
1100 # Force value to 0/1
1101 val = int(val)
1102 elif isinstance(val, str):
1103 val = '"' + val + '"'
1104
1105 # Sources are variable name & value (packaged in SCons Value nodes)
1106 return ([target], [Value(variable), Value(val)])
1107
1108config_builder = Builder(emitter = config_emitter, action = config_action)
1109
1110main.Append(BUILDERS = { 'ConfigFile' : config_builder })
1111
1112# libelf build is shared across all configs in the build root.
1113main.SConscript('ext/libelf/SConscript',
1114 variant_dir = joinpath(build_root, 'libelf'))
1115
1116# gzstream build is shared across all configs in the build root.
1117main.SConscript('ext/gzstream/SConscript',
1118 variant_dir = joinpath(build_root, 'gzstream'))
1119
1120# libfdt build is shared across all configs in the build root.
1121main.SConscript('ext/libfdt/SConscript',
1122 variant_dir = joinpath(build_root, 'libfdt'))
1123
1124###################################################
1125#
1126# This function is used to set up a directory with switching headers
1127#
1128###################################################
1129
1130main['ALL_ISA_LIST'] = all_isa_list
1131def make_switching_dir(dname, switch_headers, env):
1132 # Generate the header. target[0] is the full path of the output
1133 # header to generate. 'source' is a dummy variable, since we get the
1134 # list of ISAs from env['ALL_ISA_LIST'].
1135 def gen_switch_hdr(target, source, env):
1136 fname = str(target[0])
1137 f = open(fname, 'w')
1138 isa = env['TARGET_ISA'].lower()
1139 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
1140 f.close()
1141
1142 # Build SCons Action object. 'varlist' specifies env vars that this
1143 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1144 # should get re-executed.
1145 switch_hdr_action = MakeAction(gen_switch_hdr,
1146 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
1147
1148 # Instantiate actions for each header
1149 for hdr in switch_headers:
1150 env.Command(hdr, [], switch_hdr_action)
1151Export('make_switching_dir')
1152
1153###################################################
1154#
1155# Define build environments for selected configurations.
1156#
1157###################################################
1158
1159for variant_path in variant_paths:
1160 print "Building in", variant_path
1161
1162 # Make a copy of the build-root environment to use for this config.
1163 env = main.Clone()
1164 env['BUILDDIR'] = variant_path
1165
1166 # variant_dir is the tail component of build path, and is used to
1167 # determine the build parameters (e.g., 'ALPHA_SE')
1168 (build_root, variant_dir) = splitpath(variant_path)
1169
1170 # Set env variables according to the build directory config.
1171 sticky_vars.files = []
1172 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1173 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1174 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1175 current_vars_file = joinpath(build_root, 'variables', variant_dir)
1176 if isfile(current_vars_file):
1177 sticky_vars.files.append(current_vars_file)
1178 print "Using saved variables file %s" % current_vars_file
1179 else:
1180 # Build dir-specific variables file doesn't exist.
1181
1182 # Make sure the directory is there so we can create it later
1183 opt_dir = dirname(current_vars_file)
1184 if not isdir(opt_dir):
1185 mkdir(opt_dir)
1186
1187 # Get default build variables from source tree. Variables are
1188 # normally determined by name of $VARIANT_DIR, but can be
1189 # overridden by '--default=' arg on command line.
1190 default = GetOption('default')
1191 opts_dir = joinpath(main.root.abspath, 'build_opts')
1192 if default:
1193 default_vars_files = [joinpath(build_root, 'variables', default),
1194 joinpath(opts_dir, default)]
1195 else:
1196 default_vars_files = [joinpath(opts_dir, variant_dir)]
1197 existing_files = filter(isfile, default_vars_files)
1198 if existing_files:
1199 default_vars_file = existing_files[0]
1200 sticky_vars.files.append(default_vars_file)
1201 print "Variables file %s not found,\n using defaults in %s" \
1202 % (current_vars_file, default_vars_file)
1203 else:
1204 print "Error: cannot find variables file %s or " \
1205 "default file(s) %s" \
1206 % (current_vars_file, ' or '.join(default_vars_files))
1207 Exit(1)
1208
1209 # Apply current variable settings to env
1210 sticky_vars.Update(env)
1211
1212 help_texts["local_vars"] += \
1213 "Build variables for %s:\n" % variant_dir \
1214 + sticky_vars.GenerateHelpText(env)
1215
1216 # Process variable settings.
1217
1218 if not have_fenv and env['USE_FENV']:
1219 print "Warning: <fenv.h> not available; " \
1220 "forcing USE_FENV to False in", variant_dir + "."
1221 env['USE_FENV'] = False
1222
1223 if not env['USE_FENV']:
1224 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
1225 print " FP results may deviate slightly from other platforms."
1226
1227 if env['EFENCE']:
1228 env.Append(LIBS=['efence'])
1229
1230 if env['USE_KVM']:
1231 if not have_kvm:
1232 print "Warning: Can not enable KVM, host seems to lack KVM support"
1233 env['USE_KVM'] = False
1234 elif not is_isa_kvm_compatible(env['TARGET_ISA']):
1235 print "Info: KVM support disabled due to unsupported host and " \
1236 "target ISA combination"
1237 env['USE_KVM'] = False
1238
1239 # Save sticky variable settings back to current variables file
1240 sticky_vars.Save(current_vars_file, env)
1241
1242 if env['USE_SSE2']:
1243 env.Append(CCFLAGS=['-msse2'])
1244
1245 # The src/SConscript file sets up the build rules in 'env' according
1246 # to the configured variables. It returns a list of environments,
1247 # one for each variant build (debug, opt, etc.)
1248 envList = SConscript('src/SConscript', variant_dir = variant_path,
1249 exports = 'env')
1250
1251 # Set up the regression tests for each build.
1252 for e in envList:
1253 SConscript('tests/SConscript',
1254 variant_dir = joinpath(variant_path, 'tests', e.Label),
1255 exports = { 'env' : e }, duplicate = False)
1256
1257# base help text
1258Help('''
1259Usage: scons [scons options] [build variables] [target(s)]
1260
1261Extra scons options:
1262%(options)s
1263
1264Global build variables:
1265%(global_vars)s
1266
1267%(local_vars)s
1268''' % help_texts)