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 ('m5'), 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_FS/m5.opt' for
41# the optimized full-system version).
42#
43# You can build M5 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>/m5 ; scons build/ALPHA_FS/m5.debug
53# % cd <path-to-src>/m5/build/ALPHA_FS; scons -u m5.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>/m5 ; scons /local/foo/build/ALPHA_FS/m5.debug
60# % cd /local/foo/build/ALPHA_FS; scons -C <path-to-src>/m5 m5.debug
61#
62# You can use 'scons -H' to print scons options. If you're in this
63# 'm5' directory (or use -u or -C to tell scons where to find this
64# file), you can use 'scons -h' to print all the M5-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://m5sim.org/wiki/index.php/Compiling_M5
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://m5sim.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, # M5 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
123
124help_texts = {
125 "options" : "",
126 "global_vars" : "",
127 "local_vars" : ""
128}
129
130Export("help_texts")
131
132def AddM5Option(*args, **kwargs):
133 col_width = 30
134
135 help = " " + ", ".join(args)
136 if "help" in kwargs:
137 length = len(help)
138 if length >= col_width:
139 help += "\n" + " " * col_width
140 else:
141 help += " " * (col_width - length)
142 help += kwargs["help"]
143 help_texts["options"] += help + "\n"
144
145 AddOption(*args, **kwargs)
146
147AddM5Option('--colors', dest='use_colors', action='store_true',
148 help="Add color to abbreviated scons output")
149AddM5Option('--no-colors', dest='use_colors', action='store_false',
150 help="Don't add color to abbreviated scons output")
151AddM5Option('--default', dest='default', type='string', action='store',
152 help='Override which build_opts file to use for defaults')
153AddM5Option('--ignore-style', dest='ignore_style', action='store_true',
154 help='Disable style checking hooks')
155AddM5Option('--update-ref', dest='update_ref', action='store_true',
156 help='Update test reference outputs')
157AddM5Option('--verbose', dest='verbose', action='store_true',
158 help='Print full tool command lines')
159
160use_colors = GetOption('use_colors')
161if use_colors:
162 from m5.util.terminal import termcap
163elif use_colors is None:
164 # option unspecified; default behavior is to use colors iff isatty
165 from m5.util.terminal import tty_termcap as termcap
166else:
167 from m5.util.terminal import no_termcap as termcap
168
169########################################################################
170#
171# Set up the main build environment.
172#
173########################################################################
174use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH', 'PATH',
175 'PYTHONPATH', 'RANLIB' ])
176
177use_env = {}
178for key,val in os.environ.iteritems():
179 if key in use_vars or key.startswith("M5"):
180 use_env[key] = val
181
182main = Environment(ENV=use_env)
183main.root = Dir(".") # The current directory (where this file lives).
184main.srcdir = Dir("src") # The source directory
185
186# add useful python code PYTHONPATH so it can be used by subprocesses
187# as well
188main.AppendENVPath('PYTHONPATH', extra_python_paths)
189
190########################################################################
191#
192# Mercurial Stuff.
193#
194# If the M5 directory is a mercurial repository, we should do some
195# extra things.
196#
197########################################################################
198
199hgdir = main.root.Dir(".hg")
200
201mercurial_style_message = """
202You're missing the gem5 style hook, which automatically checks your code
203against the gem5 style rules on hg commit and qrefresh commands. This
204script will now install the hook in your .hg/hgrc file.
205Press enter to continue, or ctrl-c to abort: """
206
207mercurial_style_hook = """
208# The following lines were automatically added by gem5/SConstruct
209# to provide the gem5 style-checking hooks
210[extensions]
211style = %s/util/style.py
212
213[hooks]
214pretxncommit.style = python:style.check_style
215pre-qrefresh.style = python:style.check_style
216# End of SConstruct additions
217
218""" % (main.root.abspath)
219
220mercurial_lib_not_found = """
221Mercurial libraries cannot be found, ignoring style hook. If
222you are a gem5 developer, please fix this and run the style
223hook. It is important.
224"""
225
226# Check for style hook and prompt for installation if it's not there.
227# Skip this if --ignore-style was specified, there's no .hg dir to
228# install a hook in, or there's no interactive terminal to prompt.
229if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
230 style_hook = True
231 try:
232 from mercurial import ui
233 ui = ui.ui()
234 ui.readconfig(hgdir.File('hgrc').abspath)
235 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
236 ui.config('hooks', 'pre-qrefresh.style', None)
237 except ImportError:
238 print mercurial_lib_not_found
239
240 if not style_hook:
241 print mercurial_style_message,
242 # continue unless user does ctrl-c/ctrl-d etc.
243 try:
244 raw_input()
245 except:
246 print "Input exception, exiting scons.\n"
247 sys.exit(1)
248 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
249 print "Adding style hook to", hgrc_path, "\n"
250 try:
251 hgrc = open(hgrc_path, 'a')
252 hgrc.write(mercurial_style_hook)
253 hgrc.close()
254 except:
255 print "Error updating", hgrc_path
256 sys.exit(1)
257
258
259###################################################
260#
261# Figure out which configurations to set up based on the path(s) of
262# the target(s).
263#
264###################################################
265
266# Find default configuration & binary.
267Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
268
269# helper function: find last occurrence of element in list
270def rfind(l, elt, offs = -1):
271 for i in range(len(l)+offs, 0, -1):
272 if l[i] == elt:
273 return i
274 raise ValueError, "element not found"
275
276# Take a list of paths (or SCons Nodes) and return a list with all
277# paths made absolute and ~-expanded. Paths will be interpreted
278# relative to the launch directory unless a different root is provided
279def makePathListAbsolute(path_list, root=GetLaunchDir()):
280 return [abspath(joinpath(root, expanduser(str(p))))
281 for p in path_list]
282
283# Each target must have 'build' in the interior of the path; the
284# directory below this will determine the build parameters. For
285# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
286# recognize that ALPHA_SE specifies the configuration because it
287# follow 'build' in the build path.
288
289# The funky assignment to "[:]" is needed to replace the list contents
290# in place rather than reassign the symbol to a new list, which
291# doesn't work (obviously!).
292BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
293
294# Generate a list of the unique build roots and configs that the
295# collected targets reference.
296variant_paths = []
297build_root = None
298for t in BUILD_TARGETS:
299 path_dirs = t.split('/')
300 try:
301 build_top = rfind(path_dirs, 'build', -2)
302 except:
303 print "Error: no non-leaf 'build' dir found on target path", t
304 Exit(1)
305 this_build_root = joinpath('/',*path_dirs[:build_top+1])
306 if not build_root:
307 build_root = this_build_root
308 else:
309 if this_build_root != build_root:
310 print "Error: build targets not under same build root\n"\
311 " %s\n %s" % (build_root, this_build_root)
312 Exit(1)
313 variant_path = joinpath('/',*path_dirs[:build_top+2])
314 if variant_path not in variant_paths:
315 variant_paths.append(variant_path)
316
317# Make sure build_root exists (might not if this is the first build there)
318if not isdir(build_root):
319 mkdir(build_root)
320main['BUILDROOT'] = build_root
321
322Export('main')
323
324main.SConsignFile(joinpath(build_root, "sconsign"))
325
326# Default duplicate option is to use hard links, but this messes up
327# when you use emacs to edit a file in the target dir, as emacs moves
328# file to file~ then copies to file, breaking the link. Symbolic
329# (soft) links work better.
330main.SetOption('duplicate', 'soft-copy')
331
332#
333# Set up global sticky variables... these are common to an entire build
334# tree (not specific to a particular build like ALPHA_SE)
335#
336
337global_vars_file = joinpath(build_root, 'variables.global')
338
339global_vars = Variables(global_vars_file, args=ARGUMENTS)
340
341global_vars.AddVariables(
342 ('CC', 'C compiler', environ.get('CC', main['CC'])),
343 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
344 ('BATCH', 'Use batch pool for build and tests', False),
345 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
346 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
347 ('EXTRAS', 'Add extra directories to the compilation', '')
348 )
349
350# Update main environment with values from ARGUMENTS & global_vars_file
351global_vars.Update(main)
352help_texts["global_vars"] += global_vars.GenerateHelpText(main)
353
354# Save sticky variable settings back to current variables file
355global_vars.Save(global_vars_file, main)
356
357# Parse EXTRAS variable to build list of all directories where we're
358# look for sources etc. This list is exported as extras_dir_list.
359base_dir = main.srcdir.abspath
360if main['EXTRAS']:
361 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
362else:
363 extras_dir_list = []
364
365Export('base_dir')
366Export('extras_dir_list')
367
368# the ext directory should be on the #includes path
369main.Append(CPPPATH=[Dir('ext')])
370
371def strip_build_path(path, env):
372 path = str(path)
373 variant_base = env['BUILDROOT'] + os.path.sep
374 if path.startswith(variant_base):
375 path = path[len(variant_base):]
376 elif path.startswith('build/'):
377 path = path[6:]
378 return path
379
380# Generate a string of the form:
381# common/path/prefix/src1, src2 -> tgt1, tgt2
382# to print while building.
383class Transform(object):
384 # all specific color settings should be here and nowhere else
385 tool_color = termcap.Normal
386 pfx_color = termcap.Yellow
387 srcs_color = termcap.Yellow + termcap.Bold
388 arrow_color = termcap.Blue + termcap.Bold
389 tgts_color = termcap.Yellow + termcap.Bold
390
391 def __init__(self, tool, max_sources=99):
392 self.format = self.tool_color + (" [%8s] " % tool) \
393 + self.pfx_color + "%s" \
394 + self.srcs_color + "%s" \
395 + self.arrow_color + " -> " \
396 + self.tgts_color + "%s" \
397 + termcap.Normal
398 self.max_sources = max_sources
399
400 def __call__(self, target, source, env, for_signature=None):
401 # truncate source list according to max_sources param
402 source = source[0:self.max_sources]
403 def strip(f):
404 return strip_build_path(str(f), env)
405 if len(source) > 0:
406 srcs = map(strip, source)
407 else:
408 srcs = ['']
409 tgts = map(strip, target)
410 # surprisingly, os.path.commonprefix is a dumb char-by-char string
411 # operation that has nothing to do with paths.
412 com_pfx = os.path.commonprefix(srcs + tgts)
413 com_pfx_len = len(com_pfx)
414 if com_pfx:
415 # do some cleanup and sanity checking on common prefix
416 if com_pfx[-1] == ".":
417 # prefix matches all but file extension: ok
418 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
419 com_pfx = com_pfx[0:-1]
420 elif com_pfx[-1] == "/":
421 # common prefix is directory path: OK
422 pass
423 else:
424 src0_len = len(srcs[0])
425 tgt0_len = len(tgts[0])
426 if src0_len == com_pfx_len:
427 # source is a substring of target, OK
428 pass
429 elif tgt0_len == com_pfx_len:
430 # target is a substring of source, need to back up to
431 # avoid empty string on RHS of arrow
432 sep_idx = com_pfx.rfind(".")
433 if sep_idx != -1:
434 com_pfx = com_pfx[0:sep_idx]
435 else:
436 com_pfx = ''
437 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
438 # still splitting at file extension: ok
439 pass
440 else:
441 # probably a fluke; ignore it
442 com_pfx = ''
443 # recalculate length in case com_pfx was modified
444 com_pfx_len = len(com_pfx)
445 def fmt(files):
446 f = map(lambda s: s[com_pfx_len:], files)
447 return ', '.join(f)
448 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
449
450Export('Transform')
451
452
453if GetOption('verbose'):
454 def MakeAction(action, string, *args, **kwargs):
455 return Action(action, *args, **kwargs)
456else:
457 MakeAction = Action
458 main['CCCOMSTR'] = Transform("CC")
459 main['CXXCOMSTR'] = Transform("CXX")
460 main['ASCOMSTR'] = Transform("AS")
461 main['SWIGCOMSTR'] = Transform("SWIG")
462 main['ARCOMSTR'] = Transform("AR", 0)
463 main['LINKCOMSTR'] = Transform("LINK", 0)
464 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
465 main['M4COMSTR'] = Transform("M4")
466 main['SHCCCOMSTR'] = Transform("SHCC")
467 main['SHCXXCOMSTR'] = Transform("SHCXX")
468Export('MakeAction')
469
470CXX_version = readCommand([main['CXX'],'--version'], exception=False)
471CXX_V = readCommand([main['CXX'],'-V'], exception=False)
472
473main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
474main['SUNCC'] = CXX_V and CXX_V.find('Sun C++') >= 0
475main['ICC'] = CXX_V and CXX_V.find('Intel') >= 0
476if main['GCC'] + main['SUNCC'] + main['ICC'] > 1:
477 print 'Error: How can we have two at the same time?'
478 Exit(1)
479
480# Set up default C++ compiler flags
481if main['GCC']:
482 main.Append(CCFLAGS=['-pipe'])
483 main.Append(CCFLAGS=['-fno-strict-aliasing'])
484 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
485 main.Append(CXXFLAGS=['-Wno-deprecated'])
486 # Read the GCC version to check for versions with bugs
487 # Note CCVERSION doesn't work here because it is run with the CC
488 # before we override it from the command line
489 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
490 if not compareVersions(gcc_version, '4.4.1') or \
491 not compareVersions(gcc_version, '4.4.2'):
492 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
493 main.Append(CCFLAGS=['-fno-tree-vectorize'])
494elif main['ICC']:
495 pass #Fix me... add warning flags once we clean up icc warnings
496elif main['SUNCC']:
497 main.Append(CCFLAGS=['-Qoption ccfe'])
498 main.Append(CCFLAGS=['-features=gcc'])
499 main.Append(CCFLAGS=['-features=extensions'])
500 main.Append(CCFLAGS=['-library=stlport4'])
501 main.Append(CCFLAGS=['-xar'])
502 #main.Append(CCFLAGS=['-instances=semiexplicit'])
503else:
504 print 'Error: Don\'t know what compiler options to use for your compiler.'
505 print ' Please fix SConstruct and src/SConscript and try again.'
506 Exit(1)
507
508# Set up common yacc/bison flags (needed for Ruby)
509main['YACCFLAGS'] = '-d'
510main['YACCHXXFILESUFFIX'] = '.hh'
511
512# Do this after we save setting back, or else we'll tack on an
513# extra 'qdo' every time we run scons.
514if main['BATCH']:
515 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
516 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
517 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
518 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
519 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
520
521if sys.platform == 'cygwin':
522 # cygwin has some header file issues...
523 main.Append(CCFLAGS=["-Wno-uninitialized"])
524
525# Check for SWIG
526if not main.has_key('SWIG'):
527 print 'Error: SWIG utility not found.'
528 print ' Please install (see http://www.swig.org) and retry.'
529 Exit(1)
530
531# Check for appropriate SWIG version
532swig_version = readCommand(('swig', '-version'), exception='').split()
533# First 3 words should be "SWIG Version x.y.z"
534if len(swig_version) < 3 or \
535 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
536 print 'Error determining SWIG version.'
537 Exit(1)
538
539min_swig_version = '1.3.28'
540if compareVersions(swig_version[2], min_swig_version) < 0:
541 print 'Error: SWIG version', min_swig_version, 'or newer required.'
542 print ' Installed version:', swig_version[2]
543 Exit(1)
544
545# Set up SWIG flags & scanner
546swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
547main.Append(SWIGFLAGS=swig_flags)
548
549# filter out all existing swig scanners, they mess up the dependency
550# stuff for some reason
551scanners = []
552for scanner in main['SCANNERS']:
553 skeys = scanner.skeys
554 if skeys == '.i':
555 continue
556
557 if isinstance(skeys, (list, tuple)) and '.i' in skeys:
558 continue
559
560 scanners.append(scanner)
561
562# add the new swig scanner that we like better
563from SCons.Scanner import ClassicCPP as CPPScanner
564swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
565scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
566
567# replace the scanners list that has what we want
568main['SCANNERS'] = scanners
569
570# Add a custom Check function to the Configure context so that we can
571# figure out if the compiler adds leading underscores to global
572# variables. This is needed for the autogenerated asm files that we
573# use for embedding the python code.
574def CheckLeading(context):
575 context.Message("Checking for leading underscore in global variables...")
576 # 1) Define a global variable called x from asm so the C compiler
577 # won't change the symbol at all.
578 # 2) Declare that variable.
579 # 3) Use the variable
580 #
581 # If the compiler prepends an underscore, this will successfully
582 # link because the external symbol 'x' will be called '_x' which
583 # was defined by the asm statement. If the compiler does not
584 # prepend an underscore, this will not successfully link because
585 # '_x' will have been defined by assembly, while the C portion of
586 # the code will be trying to use 'x'
587 ret = context.TryLink('''
588 asm(".globl _x; _x: .byte 0");
589 extern int x;
590 int main() { return x; }
591 ''', extension=".c")
592 context.env.Append(LEADING_UNDERSCORE=ret)
593 context.Result(ret)
594 return ret
595
596# Platform-specific configuration. Note again that we assume that all
597# builds under a given build root run on the same host platform.
598conf = Configure(main,
599 conf_dir = joinpath(build_root, '.scons_config'),
600 log_file = joinpath(build_root, 'scons_config.log'),
601 custom_tests = { 'CheckLeading' : CheckLeading })
602
603# Check for leading underscores. Don't really need to worry either
604# way so don't need to check the return code.
605conf.CheckLeading()
606
607# Check if we should compile a 64 bit binary on Mac OS X/Darwin
608try:
609 import platform
610 uname = platform.uname()
611 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
612 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
613 main.Append(CCFLAGS=['-arch', 'x86_64'])
614 main.Append(CFLAGS=['-arch', 'x86_64'])
615 main.Append(LINKFLAGS=['-arch', 'x86_64'])
616 main.Append(ASFLAGS=['-arch', 'x86_64'])
617except:
618 pass
619
620# Recent versions of scons substitute a "Null" object for Configure()
621# when configuration isn't necessary, e.g., if the "--help" option is
622# present. Unfortuantely this Null object always returns false,
623# breaking all our configuration checks. We replace it with our own
624# more optimistic null object that returns True instead.
625if not conf:
626 def NullCheck(*args, **kwargs):
627 return True
628
629 class NullConf:
630 def __init__(self, env):
631 self.env = env
632 def Finish(self):
633 return self.env
634 def __getattr__(self, mname):
635 return NullCheck
636
637 conf = NullConf(main)
638
639# Find Python include and library directories for embedding the
640# interpreter. For consistency, we will use the same Python
641# installation used to run scons (and thus this script). If you want
642# to link in an alternate version, see above for instructions on how
643# to invoke scons with a different copy of the Python interpreter.
644from distutils import sysconfig
645
646py_getvar = sysconfig.get_config_var
647
648py_debug = getattr(sys, 'pydebug', False)
649py_version = 'python' + py_getvar('VERSION') + (py_debug and "_d" or "")
650
651py_general_include = sysconfig.get_python_inc()
652py_platform_include = sysconfig.get_python_inc(plat_specific=True)
653py_includes = [ py_general_include ]
654if py_platform_include != py_general_include:
655 py_includes.append(py_platform_include)
656
657py_lib_path = [ py_getvar('LIBDIR') ]
658# add the prefix/lib/pythonX.Y/config dir, but only if there is no
659# shared library in prefix/lib/.
660if not py_getvar('Py_ENABLE_SHARED'):
661 py_lib_path.append(py_getvar('LIBPL'))
662
663py_libs = []
664for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split():
665 assert lib.startswith('-l')
666 lib = lib[2:]
667 if lib not in py_libs:
668 py_libs.append(lib)
669py_libs.append(py_version)
670
671main.Append(CPPPATH=py_includes)
672main.Append(LIBPATH=py_lib_path)
673
674# Cache build files in the supplied directory.
675if main['M5_BUILD_CACHE']:
676 print 'Using build cache located at', main['M5_BUILD_CACHE']
677 CacheDir(main['M5_BUILD_CACHE'])
678
679
680# verify that this stuff works
681if not conf.CheckHeader('Python.h', '<>'):
682 print "Error: can't find Python.h header in", py_includes
683 Exit(1)
684
685for lib in py_libs:
686 if not conf.CheckLib(lib):
687 print "Error: can't find library %s required by python" % lib
688 Exit(1)
689
690# On Solaris you need to use libsocket for socket ops
691if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
692 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
693 print "Can't find library with socket calls (e.g. accept())"
694 Exit(1)
695
696# Check for zlib. If the check passes, libz will be automatically
697# added to the LIBS environment variable.
698if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
699 print 'Error: did not find needed zlib compression library '\
700 'and/or zlib.h header file.'
701 print ' Please install zlib and try again.'
702 Exit(1)
703
704# Check for librt.
705have_posix_clock = \
706 conf.CheckLibWithHeader(None, 'time.h', 'C',
707 'clock_nanosleep(0,0,NULL,NULL);') or \
708 conf.CheckLibWithHeader('rt', 'time.h', 'C',
709 'clock_nanosleep(0,0,NULL,NULL);')
710
711if not have_posix_clock:
712 print "Can't find library for POSIX clocks."
713
714# Check for <fenv.h> (C99 FP environment control)
715have_fenv = conf.CheckHeader('fenv.h', '<>')
716if not have_fenv:
717 print "Warning: Header file <fenv.h> not found."
718 print " This host has no IEEE FP rounding mode control."
719
720######################################################################
721#
722# Finish the configuration
723#
724main = conf.Finish()
725
726######################################################################
727#
728# Collect all non-global variables
729#
730
731# Define the universe of supported ISAs
732all_isa_list = [ ]
733Export('all_isa_list')
734
735class CpuModel(object):
736 '''The CpuModel class encapsulates everything the ISA parser needs to
737 know about a particular CPU model.'''
738
739 # Dict of available CPU model objects. Accessible as CpuModel.dict.
740 dict = {}
741 list = []
742 defaults = []
743
744 # Constructor. Automatically adds models to CpuModel.dict.
745 def __init__(self, name, filename, includes, strings, default=False):
746 self.name = name # name of model
747 self.filename = filename # filename for output exec code
748 self.includes = includes # include files needed in exec file
749 # The 'strings' dict holds all the per-CPU symbols we can
750 # substitute into templates etc.
751 self.strings = strings
752
753 # This cpu is enabled by default
754 self.default = default
755
756 # Add self to dict
757 if name in CpuModel.dict:
758 raise AttributeError, "CpuModel '%s' already registered" % name
759 CpuModel.dict[name] = self
760 CpuModel.list.append(name)
761
762Export('CpuModel')
763
764# Sticky variables get saved in the variables file so they persist from
765# one invocation to the next (unless overridden, in which case the new
766# value becomes sticky).
767sticky_vars = Variables(args=ARGUMENTS)
768Export('sticky_vars')
769
770# Sticky variables that should be exported
771export_vars = []
772Export('export_vars')
773
774# Walk the tree and execute all SConsopts scripts that wil add to the
775# above variables
| 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 ('m5'), 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_FS/m5.opt' for
41# the optimized full-system version).
42#
43# You can build M5 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>/m5 ; scons build/ALPHA_FS/m5.debug
53# % cd <path-to-src>/m5/build/ALPHA_FS; scons -u m5.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>/m5 ; scons /local/foo/build/ALPHA_FS/m5.debug
60# % cd /local/foo/build/ALPHA_FS; scons -C <path-to-src>/m5 m5.debug
61#
62# You can use 'scons -H' to print scons options. If you're in this
63# 'm5' directory (or use -u or -C to tell scons where to find this
64# file), you can use 'scons -h' to print all the M5-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://m5sim.org/wiki/index.php/Compiling_M5
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://m5sim.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, # M5 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
123
124help_texts = {
125 "options" : "",
126 "global_vars" : "",
127 "local_vars" : ""
128}
129
130Export("help_texts")
131
132def AddM5Option(*args, **kwargs):
133 col_width = 30
134
135 help = " " + ", ".join(args)
136 if "help" in kwargs:
137 length = len(help)
138 if length >= col_width:
139 help += "\n" + " " * col_width
140 else:
141 help += " " * (col_width - length)
142 help += kwargs["help"]
143 help_texts["options"] += help + "\n"
144
145 AddOption(*args, **kwargs)
146
147AddM5Option('--colors', dest='use_colors', action='store_true',
148 help="Add color to abbreviated scons output")
149AddM5Option('--no-colors', dest='use_colors', action='store_false',
150 help="Don't add color to abbreviated scons output")
151AddM5Option('--default', dest='default', type='string', action='store',
152 help='Override which build_opts file to use for defaults')
153AddM5Option('--ignore-style', dest='ignore_style', action='store_true',
154 help='Disable style checking hooks')
155AddM5Option('--update-ref', dest='update_ref', action='store_true',
156 help='Update test reference outputs')
157AddM5Option('--verbose', dest='verbose', action='store_true',
158 help='Print full tool command lines')
159
160use_colors = GetOption('use_colors')
161if use_colors:
162 from m5.util.terminal import termcap
163elif use_colors is None:
164 # option unspecified; default behavior is to use colors iff isatty
165 from m5.util.terminal import tty_termcap as termcap
166else:
167 from m5.util.terminal import no_termcap as termcap
168
169########################################################################
170#
171# Set up the main build environment.
172#
173########################################################################
174use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH', 'PATH',
175 'PYTHONPATH', 'RANLIB' ])
176
177use_env = {}
178for key,val in os.environ.iteritems():
179 if key in use_vars or key.startswith("M5"):
180 use_env[key] = val
181
182main = Environment(ENV=use_env)
183main.root = Dir(".") # The current directory (where this file lives).
184main.srcdir = Dir("src") # The source directory
185
186# add useful python code PYTHONPATH so it can be used by subprocesses
187# as well
188main.AppendENVPath('PYTHONPATH', extra_python_paths)
189
190########################################################################
191#
192# Mercurial Stuff.
193#
194# If the M5 directory is a mercurial repository, we should do some
195# extra things.
196#
197########################################################################
198
199hgdir = main.root.Dir(".hg")
200
201mercurial_style_message = """
202You're missing the gem5 style hook, which automatically checks your code
203against the gem5 style rules on hg commit and qrefresh commands. This
204script will now install the hook in your .hg/hgrc file.
205Press enter to continue, or ctrl-c to abort: """
206
207mercurial_style_hook = """
208# The following lines were automatically added by gem5/SConstruct
209# to provide the gem5 style-checking hooks
210[extensions]
211style = %s/util/style.py
212
213[hooks]
214pretxncommit.style = python:style.check_style
215pre-qrefresh.style = python:style.check_style
216# End of SConstruct additions
217
218""" % (main.root.abspath)
219
220mercurial_lib_not_found = """
221Mercurial libraries cannot be found, ignoring style hook. If
222you are a gem5 developer, please fix this and run the style
223hook. It is important.
224"""
225
226# Check for style hook and prompt for installation if it's not there.
227# Skip this if --ignore-style was specified, there's no .hg dir to
228# install a hook in, or there's no interactive terminal to prompt.
229if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty():
230 style_hook = True
231 try:
232 from mercurial import ui
233 ui = ui.ui()
234 ui.readconfig(hgdir.File('hgrc').abspath)
235 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \
236 ui.config('hooks', 'pre-qrefresh.style', None)
237 except ImportError:
238 print mercurial_lib_not_found
239
240 if not style_hook:
241 print mercurial_style_message,
242 # continue unless user does ctrl-c/ctrl-d etc.
243 try:
244 raw_input()
245 except:
246 print "Input exception, exiting scons.\n"
247 sys.exit(1)
248 hgrc_path = '%s/.hg/hgrc' % main.root.abspath
249 print "Adding style hook to", hgrc_path, "\n"
250 try:
251 hgrc = open(hgrc_path, 'a')
252 hgrc.write(mercurial_style_hook)
253 hgrc.close()
254 except:
255 print "Error updating", hgrc_path
256 sys.exit(1)
257
258
259###################################################
260#
261# Figure out which configurations to set up based on the path(s) of
262# the target(s).
263#
264###################################################
265
266# Find default configuration & binary.
267Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
268
269# helper function: find last occurrence of element in list
270def rfind(l, elt, offs = -1):
271 for i in range(len(l)+offs, 0, -1):
272 if l[i] == elt:
273 return i
274 raise ValueError, "element not found"
275
276# Take a list of paths (or SCons Nodes) and return a list with all
277# paths made absolute and ~-expanded. Paths will be interpreted
278# relative to the launch directory unless a different root is provided
279def makePathListAbsolute(path_list, root=GetLaunchDir()):
280 return [abspath(joinpath(root, expanduser(str(p))))
281 for p in path_list]
282
283# Each target must have 'build' in the interior of the path; the
284# directory below this will determine the build parameters. For
285# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
286# recognize that ALPHA_SE specifies the configuration because it
287# follow 'build' in the build path.
288
289# The funky assignment to "[:]" is needed to replace the list contents
290# in place rather than reassign the symbol to a new list, which
291# doesn't work (obviously!).
292BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS)
293
294# Generate a list of the unique build roots and configs that the
295# collected targets reference.
296variant_paths = []
297build_root = None
298for t in BUILD_TARGETS:
299 path_dirs = t.split('/')
300 try:
301 build_top = rfind(path_dirs, 'build', -2)
302 except:
303 print "Error: no non-leaf 'build' dir found on target path", t
304 Exit(1)
305 this_build_root = joinpath('/',*path_dirs[:build_top+1])
306 if not build_root:
307 build_root = this_build_root
308 else:
309 if this_build_root != build_root:
310 print "Error: build targets not under same build root\n"\
311 " %s\n %s" % (build_root, this_build_root)
312 Exit(1)
313 variant_path = joinpath('/',*path_dirs[:build_top+2])
314 if variant_path not in variant_paths:
315 variant_paths.append(variant_path)
316
317# Make sure build_root exists (might not if this is the first build there)
318if not isdir(build_root):
319 mkdir(build_root)
320main['BUILDROOT'] = build_root
321
322Export('main')
323
324main.SConsignFile(joinpath(build_root, "sconsign"))
325
326# Default duplicate option is to use hard links, but this messes up
327# when you use emacs to edit a file in the target dir, as emacs moves
328# file to file~ then copies to file, breaking the link. Symbolic
329# (soft) links work better.
330main.SetOption('duplicate', 'soft-copy')
331
332#
333# Set up global sticky variables... these are common to an entire build
334# tree (not specific to a particular build like ALPHA_SE)
335#
336
337global_vars_file = joinpath(build_root, 'variables.global')
338
339global_vars = Variables(global_vars_file, args=ARGUMENTS)
340
341global_vars.AddVariables(
342 ('CC', 'C compiler', environ.get('CC', main['CC'])),
343 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
344 ('BATCH', 'Use batch pool for build and tests', False),
345 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
346 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
347 ('EXTRAS', 'Add extra directories to the compilation', '')
348 )
349
350# Update main environment with values from ARGUMENTS & global_vars_file
351global_vars.Update(main)
352help_texts["global_vars"] += global_vars.GenerateHelpText(main)
353
354# Save sticky variable settings back to current variables file
355global_vars.Save(global_vars_file, main)
356
357# Parse EXTRAS variable to build list of all directories where we're
358# look for sources etc. This list is exported as extras_dir_list.
359base_dir = main.srcdir.abspath
360if main['EXTRAS']:
361 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':'))
362else:
363 extras_dir_list = []
364
365Export('base_dir')
366Export('extras_dir_list')
367
368# the ext directory should be on the #includes path
369main.Append(CPPPATH=[Dir('ext')])
370
371def strip_build_path(path, env):
372 path = str(path)
373 variant_base = env['BUILDROOT'] + os.path.sep
374 if path.startswith(variant_base):
375 path = path[len(variant_base):]
376 elif path.startswith('build/'):
377 path = path[6:]
378 return path
379
380# Generate a string of the form:
381# common/path/prefix/src1, src2 -> tgt1, tgt2
382# to print while building.
383class Transform(object):
384 # all specific color settings should be here and nowhere else
385 tool_color = termcap.Normal
386 pfx_color = termcap.Yellow
387 srcs_color = termcap.Yellow + termcap.Bold
388 arrow_color = termcap.Blue + termcap.Bold
389 tgts_color = termcap.Yellow + termcap.Bold
390
391 def __init__(self, tool, max_sources=99):
392 self.format = self.tool_color + (" [%8s] " % tool) \
393 + self.pfx_color + "%s" \
394 + self.srcs_color + "%s" \
395 + self.arrow_color + " -> " \
396 + self.tgts_color + "%s" \
397 + termcap.Normal
398 self.max_sources = max_sources
399
400 def __call__(self, target, source, env, for_signature=None):
401 # truncate source list according to max_sources param
402 source = source[0:self.max_sources]
403 def strip(f):
404 return strip_build_path(str(f), env)
405 if len(source) > 0:
406 srcs = map(strip, source)
407 else:
408 srcs = ['']
409 tgts = map(strip, target)
410 # surprisingly, os.path.commonprefix is a dumb char-by-char string
411 # operation that has nothing to do with paths.
412 com_pfx = os.path.commonprefix(srcs + tgts)
413 com_pfx_len = len(com_pfx)
414 if com_pfx:
415 # do some cleanup and sanity checking on common prefix
416 if com_pfx[-1] == ".":
417 # prefix matches all but file extension: ok
418 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
419 com_pfx = com_pfx[0:-1]
420 elif com_pfx[-1] == "/":
421 # common prefix is directory path: OK
422 pass
423 else:
424 src0_len = len(srcs[0])
425 tgt0_len = len(tgts[0])
426 if src0_len == com_pfx_len:
427 # source is a substring of target, OK
428 pass
429 elif tgt0_len == com_pfx_len:
430 # target is a substring of source, need to back up to
431 # avoid empty string on RHS of arrow
432 sep_idx = com_pfx.rfind(".")
433 if sep_idx != -1:
434 com_pfx = com_pfx[0:sep_idx]
435 else:
436 com_pfx = ''
437 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".":
438 # still splitting at file extension: ok
439 pass
440 else:
441 # probably a fluke; ignore it
442 com_pfx = ''
443 # recalculate length in case com_pfx was modified
444 com_pfx_len = len(com_pfx)
445 def fmt(files):
446 f = map(lambda s: s[com_pfx_len:], files)
447 return ', '.join(f)
448 return self.format % (com_pfx, fmt(srcs), fmt(tgts))
449
450Export('Transform')
451
452
453if GetOption('verbose'):
454 def MakeAction(action, string, *args, **kwargs):
455 return Action(action, *args, **kwargs)
456else:
457 MakeAction = Action
458 main['CCCOMSTR'] = Transform("CC")
459 main['CXXCOMSTR'] = Transform("CXX")
460 main['ASCOMSTR'] = Transform("AS")
461 main['SWIGCOMSTR'] = Transform("SWIG")
462 main['ARCOMSTR'] = Transform("AR", 0)
463 main['LINKCOMSTR'] = Transform("LINK", 0)
464 main['RANLIBCOMSTR'] = Transform("RANLIB", 0)
465 main['M4COMSTR'] = Transform("M4")
466 main['SHCCCOMSTR'] = Transform("SHCC")
467 main['SHCXXCOMSTR'] = Transform("SHCXX")
468Export('MakeAction')
469
470CXX_version = readCommand([main['CXX'],'--version'], exception=False)
471CXX_V = readCommand([main['CXX'],'-V'], exception=False)
472
473main['GCC'] = CXX_version and CXX_version.find('g++') >= 0
474main['SUNCC'] = CXX_V and CXX_V.find('Sun C++') >= 0
475main['ICC'] = CXX_V and CXX_V.find('Intel') >= 0
476if main['GCC'] + main['SUNCC'] + main['ICC'] > 1:
477 print 'Error: How can we have two at the same time?'
478 Exit(1)
479
480# Set up default C++ compiler flags
481if main['GCC']:
482 main.Append(CCFLAGS=['-pipe'])
483 main.Append(CCFLAGS=['-fno-strict-aliasing'])
484 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef'])
485 main.Append(CXXFLAGS=['-Wno-deprecated'])
486 # Read the GCC version to check for versions with bugs
487 # Note CCVERSION doesn't work here because it is run with the CC
488 # before we override it from the command line
489 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
490 if not compareVersions(gcc_version, '4.4.1') or \
491 not compareVersions(gcc_version, '4.4.2'):
492 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
493 main.Append(CCFLAGS=['-fno-tree-vectorize'])
494elif main['ICC']:
495 pass #Fix me... add warning flags once we clean up icc warnings
496elif main['SUNCC']:
497 main.Append(CCFLAGS=['-Qoption ccfe'])
498 main.Append(CCFLAGS=['-features=gcc'])
499 main.Append(CCFLAGS=['-features=extensions'])
500 main.Append(CCFLAGS=['-library=stlport4'])
501 main.Append(CCFLAGS=['-xar'])
502 #main.Append(CCFLAGS=['-instances=semiexplicit'])
503else:
504 print 'Error: Don\'t know what compiler options to use for your compiler.'
505 print ' Please fix SConstruct and src/SConscript and try again.'
506 Exit(1)
507
508# Set up common yacc/bison flags (needed for Ruby)
509main['YACCFLAGS'] = '-d'
510main['YACCHXXFILESUFFIX'] = '.hh'
511
512# Do this after we save setting back, or else we'll tack on an
513# extra 'qdo' every time we run scons.
514if main['BATCH']:
515 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC']
516 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX']
517 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS']
518 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR']
519 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB']
520
521if sys.platform == 'cygwin':
522 # cygwin has some header file issues...
523 main.Append(CCFLAGS=["-Wno-uninitialized"])
524
525# Check for SWIG
526if not main.has_key('SWIG'):
527 print 'Error: SWIG utility not found.'
528 print ' Please install (see http://www.swig.org) and retry.'
529 Exit(1)
530
531# Check for appropriate SWIG version
532swig_version = readCommand(('swig', '-version'), exception='').split()
533# First 3 words should be "SWIG Version x.y.z"
534if len(swig_version) < 3 or \
535 swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
536 print 'Error determining SWIG version.'
537 Exit(1)
538
539min_swig_version = '1.3.28'
540if compareVersions(swig_version[2], min_swig_version) < 0:
541 print 'Error: SWIG version', min_swig_version, 'or newer required.'
542 print ' Installed version:', swig_version[2]
543 Exit(1)
544
545# Set up SWIG flags & scanner
546swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
547main.Append(SWIGFLAGS=swig_flags)
548
549# filter out all existing swig scanners, they mess up the dependency
550# stuff for some reason
551scanners = []
552for scanner in main['SCANNERS']:
553 skeys = scanner.skeys
554 if skeys == '.i':
555 continue
556
557 if isinstance(skeys, (list, tuple)) and '.i' in skeys:
558 continue
559
560 scanners.append(scanner)
561
562# add the new swig scanner that we like better
563from SCons.Scanner import ClassicCPP as CPPScanner
564swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
565scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
566
567# replace the scanners list that has what we want
568main['SCANNERS'] = scanners
569
570# Add a custom Check function to the Configure context so that we can
571# figure out if the compiler adds leading underscores to global
572# variables. This is needed for the autogenerated asm files that we
573# use for embedding the python code.
574def CheckLeading(context):
575 context.Message("Checking for leading underscore in global variables...")
576 # 1) Define a global variable called x from asm so the C compiler
577 # won't change the symbol at all.
578 # 2) Declare that variable.
579 # 3) Use the variable
580 #
581 # If the compiler prepends an underscore, this will successfully
582 # link because the external symbol 'x' will be called '_x' which
583 # was defined by the asm statement. If the compiler does not
584 # prepend an underscore, this will not successfully link because
585 # '_x' will have been defined by assembly, while the C portion of
586 # the code will be trying to use 'x'
587 ret = context.TryLink('''
588 asm(".globl _x; _x: .byte 0");
589 extern int x;
590 int main() { return x; }
591 ''', extension=".c")
592 context.env.Append(LEADING_UNDERSCORE=ret)
593 context.Result(ret)
594 return ret
595
596# Platform-specific configuration. Note again that we assume that all
597# builds under a given build root run on the same host platform.
598conf = Configure(main,
599 conf_dir = joinpath(build_root, '.scons_config'),
600 log_file = joinpath(build_root, 'scons_config.log'),
601 custom_tests = { 'CheckLeading' : CheckLeading })
602
603# Check for leading underscores. Don't really need to worry either
604# way so don't need to check the return code.
605conf.CheckLeading()
606
607# Check if we should compile a 64 bit binary on Mac OS X/Darwin
608try:
609 import platform
610 uname = platform.uname()
611 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0:
612 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
613 main.Append(CCFLAGS=['-arch', 'x86_64'])
614 main.Append(CFLAGS=['-arch', 'x86_64'])
615 main.Append(LINKFLAGS=['-arch', 'x86_64'])
616 main.Append(ASFLAGS=['-arch', 'x86_64'])
617except:
618 pass
619
620# Recent versions of scons substitute a "Null" object for Configure()
621# when configuration isn't necessary, e.g., if the "--help" option is
622# present. Unfortuantely this Null object always returns false,
623# breaking all our configuration checks. We replace it with our own
624# more optimistic null object that returns True instead.
625if not conf:
626 def NullCheck(*args, **kwargs):
627 return True
628
629 class NullConf:
630 def __init__(self, env):
631 self.env = env
632 def Finish(self):
633 return self.env
634 def __getattr__(self, mname):
635 return NullCheck
636
637 conf = NullConf(main)
638
639# Find Python include and library directories for embedding the
640# interpreter. For consistency, we will use the same Python
641# installation used to run scons (and thus this script). If you want
642# to link in an alternate version, see above for instructions on how
643# to invoke scons with a different copy of the Python interpreter.
644from distutils import sysconfig
645
646py_getvar = sysconfig.get_config_var
647
648py_debug = getattr(sys, 'pydebug', False)
649py_version = 'python' + py_getvar('VERSION') + (py_debug and "_d" or "")
650
651py_general_include = sysconfig.get_python_inc()
652py_platform_include = sysconfig.get_python_inc(plat_specific=True)
653py_includes = [ py_general_include ]
654if py_platform_include != py_general_include:
655 py_includes.append(py_platform_include)
656
657py_lib_path = [ py_getvar('LIBDIR') ]
658# add the prefix/lib/pythonX.Y/config dir, but only if there is no
659# shared library in prefix/lib/.
660if not py_getvar('Py_ENABLE_SHARED'):
661 py_lib_path.append(py_getvar('LIBPL'))
662
663py_libs = []
664for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split():
665 assert lib.startswith('-l')
666 lib = lib[2:]
667 if lib not in py_libs:
668 py_libs.append(lib)
669py_libs.append(py_version)
670
671main.Append(CPPPATH=py_includes)
672main.Append(LIBPATH=py_lib_path)
673
674# Cache build files in the supplied directory.
675if main['M5_BUILD_CACHE']:
676 print 'Using build cache located at', main['M5_BUILD_CACHE']
677 CacheDir(main['M5_BUILD_CACHE'])
678
679
680# verify that this stuff works
681if not conf.CheckHeader('Python.h', '<>'):
682 print "Error: can't find Python.h header in", py_includes
683 Exit(1)
684
685for lib in py_libs:
686 if not conf.CheckLib(lib):
687 print "Error: can't find library %s required by python" % lib
688 Exit(1)
689
690# On Solaris you need to use libsocket for socket ops
691if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
692 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
693 print "Can't find library with socket calls (e.g. accept())"
694 Exit(1)
695
696# Check for zlib. If the check passes, libz will be automatically
697# added to the LIBS environment variable.
698if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
699 print 'Error: did not find needed zlib compression library '\
700 'and/or zlib.h header file.'
701 print ' Please install zlib and try again.'
702 Exit(1)
703
704# Check for librt.
705have_posix_clock = \
706 conf.CheckLibWithHeader(None, 'time.h', 'C',
707 'clock_nanosleep(0,0,NULL,NULL);') or \
708 conf.CheckLibWithHeader('rt', 'time.h', 'C',
709 'clock_nanosleep(0,0,NULL,NULL);')
710
711if not have_posix_clock:
712 print "Can't find library for POSIX clocks."
713
714# Check for <fenv.h> (C99 FP environment control)
715have_fenv = conf.CheckHeader('fenv.h', '<>')
716if not have_fenv:
717 print "Warning: Header file <fenv.h> not found."
718 print " This host has no IEEE FP rounding mode control."
719
720######################################################################
721#
722# Finish the configuration
723#
724main = conf.Finish()
725
726######################################################################
727#
728# Collect all non-global variables
729#
730
731# Define the universe of supported ISAs
732all_isa_list = [ ]
733Export('all_isa_list')
734
735class CpuModel(object):
736 '''The CpuModel class encapsulates everything the ISA parser needs to
737 know about a particular CPU model.'''
738
739 # Dict of available CPU model objects. Accessible as CpuModel.dict.
740 dict = {}
741 list = []
742 defaults = []
743
744 # Constructor. Automatically adds models to CpuModel.dict.
745 def __init__(self, name, filename, includes, strings, default=False):
746 self.name = name # name of model
747 self.filename = filename # filename for output exec code
748 self.includes = includes # include files needed in exec file
749 # The 'strings' dict holds all the per-CPU symbols we can
750 # substitute into templates etc.
751 self.strings = strings
752
753 # This cpu is enabled by default
754 self.default = default
755
756 # Add self to dict
757 if name in CpuModel.dict:
758 raise AttributeError, "CpuModel '%s' already registered" % name
759 CpuModel.dict[name] = self
760 CpuModel.list.append(name)
761
762Export('CpuModel')
763
764# Sticky variables get saved in the variables file so they persist from
765# one invocation to the next (unless overridden, in which case the new
766# value becomes sticky).
767sticky_vars = Variables(args=ARGUMENTS)
768Export('sticky_vars')
769
770# Sticky variables that should be exported
771export_vars = []
772Export('export_vars')
773
774# Walk the tree and execute all SConsopts scripts that wil add to the
775# above variables
|
783 SConscript(joinpath(root, 'SConsopts'))
784
785all_isa_list.sort()
786
787sticky_vars.AddVariables(
788 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
789 BoolVariable('FULL_SYSTEM', 'Full-system support', False),
790 ListVariable('CPU_MODELS', 'CPU models',
791 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
792 sorted(CpuModel.list)),
793 BoolVariable('NO_FAST_ALLOC', 'Disable fast object allocator', False),
794 BoolVariable('FORCE_FAST_ALLOC',
795 'Enable fast object allocator, even for m5.debug', False),
796 BoolVariable('FAST_ALLOC_STATS', 'Enable fast object allocator statistics',
797 False),
798 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
799 False),
800 BoolVariable('SS_COMPATIBLE_FP',
801 'Make floating-point results compatible with SimpleScalar',
802 False),
803 BoolVariable('USE_SSE2',
804 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
805 False),
806 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
807 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
808 BoolVariable('USE_CHECKER', 'Use checker for detailed CPU models', False),
809 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
810 BoolVariable('RUBY', 'Build with Ruby', False),
811 )
812
813# These variables get exported to #defines in config/*.hh (see src/SConscript).
814export_vars += ['FULL_SYSTEM', 'USE_FENV',
815 'NO_FAST_ALLOC', 'FORCE_FAST_ALLOC', 'FAST_ALLOC_STATS',
816 'SS_COMPATIBLE_FP', 'USE_CHECKER', 'TARGET_ISA', 'CP_ANNOTATE',
817 'USE_POSIX_CLOCK' ]
818
819###################################################
820#
821# Define a SCons builder for configuration flag headers.
822#
823###################################################
824
825# This function generates a config header file that #defines the
826# variable symbol to the current variable setting (0 or 1). The source
827# operands are the name of the variable and a Value node containing the
828# value of the variable.
829def build_config_file(target, source, env):
830 (variable, value) = [s.get_contents() for s in source]
831 f = file(str(target[0]), 'w')
832 print >> f, '#define', variable, value
833 f.close()
834 return None
835
836# Generate the message to be printed when building the config file.
837def build_config_file_string(target, source, env):
838 (variable, value) = [s.get_contents() for s in source]
839 return "Defining %s as %s in %s." % (variable, value, target[0])
840
841# Combine the two functions into a scons Action object.
842config_action = Action(build_config_file, build_config_file_string)
843
844# The emitter munges the source & target node lists to reflect what
845# we're really doing.
846def config_emitter(target, source, env):
847 # extract variable name from Builder arg
848 variable = str(target[0])
849 # True target is config header file
850 target = joinpath('config', variable.lower() + '.hh')
851 val = env[variable]
852 if isinstance(val, bool):
853 # Force value to 0/1
854 val = int(val)
855 elif isinstance(val, str):
856 val = '"' + val + '"'
857
858 # Sources are variable name & value (packaged in SCons Value nodes)
859 return ([target], [Value(variable), Value(val)])
860
861config_builder = Builder(emitter = config_emitter, action = config_action)
862
863main.Append(BUILDERS = { 'ConfigFile' : config_builder })
864
865# libelf build is shared across all configs in the build root.
866main.SConscript('ext/libelf/SConscript',
867 variant_dir = joinpath(build_root, 'libelf'))
868
869# gzstream build is shared across all configs in the build root.
870main.SConscript('ext/gzstream/SConscript',
871 variant_dir = joinpath(build_root, 'gzstream'))
872
873###################################################
874#
875# This function is used to set up a directory with switching headers
876#
877###################################################
878
879main['ALL_ISA_LIST'] = all_isa_list
880def make_switching_dir(dname, switch_headers, env):
881 # Generate the header. target[0] is the full path of the output
882 # header to generate. 'source' is a dummy variable, since we get the
883 # list of ISAs from env['ALL_ISA_LIST'].
884 def gen_switch_hdr(target, source, env):
885 fname = str(target[0])
886 f = open(fname, 'w')
887 isa = env['TARGET_ISA'].lower()
888 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
889 f.close()
890
891 # Build SCons Action object. 'varlist' specifies env vars that this
892 # action depends on; when env['ALL_ISA_LIST'] changes these actions
893 # should get re-executed.
894 switch_hdr_action = MakeAction(gen_switch_hdr,
895 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
896
897 # Instantiate actions for each header
898 for hdr in switch_headers:
899 env.Command(hdr, [], switch_hdr_action)
900Export('make_switching_dir')
901
902###################################################
903#
904# Define build environments for selected configurations.
905#
906###################################################
907
908for variant_path in variant_paths:
909 print "Building in", variant_path
910
911 # Make a copy of the build-root environment to use for this config.
912 env = main.Clone()
913 env['BUILDDIR'] = variant_path
914
915 # variant_dir is the tail component of build path, and is used to
916 # determine the build parameters (e.g., 'ALPHA_SE')
917 (build_root, variant_dir) = splitpath(variant_path)
918
919 # Set env variables according to the build directory config.
920 sticky_vars.files = []
921 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
922 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
923 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
924 current_vars_file = joinpath(build_root, 'variables', variant_dir)
925 if isfile(current_vars_file):
926 sticky_vars.files.append(current_vars_file)
927 print "Using saved variables file %s" % current_vars_file
928 else:
929 # Build dir-specific variables file doesn't exist.
930
931 # Make sure the directory is there so we can create it later
932 opt_dir = dirname(current_vars_file)
933 if not isdir(opt_dir):
934 mkdir(opt_dir)
935
936 # Get default build variables from source tree. Variables are
937 # normally determined by name of $VARIANT_DIR, but can be
938 # overridden by '--default=' arg on command line.
939 default = GetOption('default')
940 opts_dir = joinpath(main.root.abspath, 'build_opts')
941 if default:
942 default_vars_files = [joinpath(build_root, 'variables', default),
943 joinpath(opts_dir, default)]
944 else:
945 default_vars_files = [joinpath(opts_dir, variant_dir)]
946 existing_files = filter(isfile, default_vars_files)
947 if existing_files:
948 default_vars_file = existing_files[0]
949 sticky_vars.files.append(default_vars_file)
950 print "Variables file %s not found,\n using defaults in %s" \
951 % (current_vars_file, default_vars_file)
952 else:
953 print "Error: cannot find variables file %s or " \
954 "default file(s) %s" \
955 % (current_vars_file, ' or '.join(default_vars_files))
956 Exit(1)
957
958 # Apply current variable settings to env
959 sticky_vars.Update(env)
960
961 help_texts["local_vars"] += \
962 "Build variables for %s:\n" % variant_dir \
963 + sticky_vars.GenerateHelpText(env)
964
965 # Process variable settings.
966
967 if not have_fenv and env['USE_FENV']:
968 print "Warning: <fenv.h> not available; " \
969 "forcing USE_FENV to False in", variant_dir + "."
970 env['USE_FENV'] = False
971
972 if not env['USE_FENV']:
973 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
974 print " FP results may deviate slightly from other platforms."
975
976 if env['EFENCE']:
977 env.Append(LIBS=['efence'])
978
979 # Save sticky variable settings back to current variables file
980 sticky_vars.Save(current_vars_file, env)
981
982 if env['USE_SSE2']:
983 env.Append(CCFLAGS=['-msse2'])
984
985 # The src/SConscript file sets up the build rules in 'env' according
986 # to the configured variables. It returns a list of environments,
987 # one for each variant build (debug, opt, etc.)
988 envList = SConscript('src/SConscript', variant_dir = variant_path,
989 exports = 'env')
990
991 # Set up the regression tests for each build.
992 for e in envList:
993 SConscript('tests/SConscript',
994 variant_dir = joinpath(variant_path, 'tests', e.Label),
995 exports = { 'env' : e }, duplicate = False)
996
997# base help text
998Help('''
999Usage: scons [scons options] [build variables] [target(s)]
1000
1001Extra scons options:
1002%(options)s
1003
1004Global build variables:
1005%(global_vars)s
1006
1007%(local_vars)s
1008''' % help_texts)
| 786 SConscript(joinpath(root, 'SConsopts'))
787
788all_isa_list.sort()
789
790sticky_vars.AddVariables(
791 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
792 BoolVariable('FULL_SYSTEM', 'Full-system support', False),
793 ListVariable('CPU_MODELS', 'CPU models',
794 sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
795 sorted(CpuModel.list)),
796 BoolVariable('NO_FAST_ALLOC', 'Disable fast object allocator', False),
797 BoolVariable('FORCE_FAST_ALLOC',
798 'Enable fast object allocator, even for m5.debug', False),
799 BoolVariable('FAST_ALLOC_STATS', 'Enable fast object allocator statistics',
800 False),
801 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
802 False),
803 BoolVariable('SS_COMPATIBLE_FP',
804 'Make floating-point results compatible with SimpleScalar',
805 False),
806 BoolVariable('USE_SSE2',
807 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
808 False),
809 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock),
810 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
811 BoolVariable('USE_CHECKER', 'Use checker for detailed CPU models', False),
812 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
813 BoolVariable('RUBY', 'Build with Ruby', False),
814 )
815
816# These variables get exported to #defines in config/*.hh (see src/SConscript).
817export_vars += ['FULL_SYSTEM', 'USE_FENV',
818 'NO_FAST_ALLOC', 'FORCE_FAST_ALLOC', 'FAST_ALLOC_STATS',
819 'SS_COMPATIBLE_FP', 'USE_CHECKER', 'TARGET_ISA', 'CP_ANNOTATE',
820 'USE_POSIX_CLOCK' ]
821
822###################################################
823#
824# Define a SCons builder for configuration flag headers.
825#
826###################################################
827
828# This function generates a config header file that #defines the
829# variable symbol to the current variable setting (0 or 1). The source
830# operands are the name of the variable and a Value node containing the
831# value of the variable.
832def build_config_file(target, source, env):
833 (variable, value) = [s.get_contents() for s in source]
834 f = file(str(target[0]), 'w')
835 print >> f, '#define', variable, value
836 f.close()
837 return None
838
839# Generate the message to be printed when building the config file.
840def build_config_file_string(target, source, env):
841 (variable, value) = [s.get_contents() for s in source]
842 return "Defining %s as %s in %s." % (variable, value, target[0])
843
844# Combine the two functions into a scons Action object.
845config_action = Action(build_config_file, build_config_file_string)
846
847# The emitter munges the source & target node lists to reflect what
848# we're really doing.
849def config_emitter(target, source, env):
850 # extract variable name from Builder arg
851 variable = str(target[0])
852 # True target is config header file
853 target = joinpath('config', variable.lower() + '.hh')
854 val = env[variable]
855 if isinstance(val, bool):
856 # Force value to 0/1
857 val = int(val)
858 elif isinstance(val, str):
859 val = '"' + val + '"'
860
861 # Sources are variable name & value (packaged in SCons Value nodes)
862 return ([target], [Value(variable), Value(val)])
863
864config_builder = Builder(emitter = config_emitter, action = config_action)
865
866main.Append(BUILDERS = { 'ConfigFile' : config_builder })
867
868# libelf build is shared across all configs in the build root.
869main.SConscript('ext/libelf/SConscript',
870 variant_dir = joinpath(build_root, 'libelf'))
871
872# gzstream build is shared across all configs in the build root.
873main.SConscript('ext/gzstream/SConscript',
874 variant_dir = joinpath(build_root, 'gzstream'))
875
876###################################################
877#
878# This function is used to set up a directory with switching headers
879#
880###################################################
881
882main['ALL_ISA_LIST'] = all_isa_list
883def make_switching_dir(dname, switch_headers, env):
884 # Generate the header. target[0] is the full path of the output
885 # header to generate. 'source' is a dummy variable, since we get the
886 # list of ISAs from env['ALL_ISA_LIST'].
887 def gen_switch_hdr(target, source, env):
888 fname = str(target[0])
889 f = open(fname, 'w')
890 isa = env['TARGET_ISA'].lower()
891 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
892 f.close()
893
894 # Build SCons Action object. 'varlist' specifies env vars that this
895 # action depends on; when env['ALL_ISA_LIST'] changes these actions
896 # should get re-executed.
897 switch_hdr_action = MakeAction(gen_switch_hdr,
898 Transform("GENERATE"), varlist=['ALL_ISA_LIST'])
899
900 # Instantiate actions for each header
901 for hdr in switch_headers:
902 env.Command(hdr, [], switch_hdr_action)
903Export('make_switching_dir')
904
905###################################################
906#
907# Define build environments for selected configurations.
908#
909###################################################
910
911for variant_path in variant_paths:
912 print "Building in", variant_path
913
914 # Make a copy of the build-root environment to use for this config.
915 env = main.Clone()
916 env['BUILDDIR'] = variant_path
917
918 # variant_dir is the tail component of build path, and is used to
919 # determine the build parameters (e.g., 'ALPHA_SE')
920 (build_root, variant_dir) = splitpath(variant_path)
921
922 # Set env variables according to the build directory config.
923 sticky_vars.files = []
924 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
925 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
926 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
927 current_vars_file = joinpath(build_root, 'variables', variant_dir)
928 if isfile(current_vars_file):
929 sticky_vars.files.append(current_vars_file)
930 print "Using saved variables file %s" % current_vars_file
931 else:
932 # Build dir-specific variables file doesn't exist.
933
934 # Make sure the directory is there so we can create it later
935 opt_dir = dirname(current_vars_file)
936 if not isdir(opt_dir):
937 mkdir(opt_dir)
938
939 # Get default build variables from source tree. Variables are
940 # normally determined by name of $VARIANT_DIR, but can be
941 # overridden by '--default=' arg on command line.
942 default = GetOption('default')
943 opts_dir = joinpath(main.root.abspath, 'build_opts')
944 if default:
945 default_vars_files = [joinpath(build_root, 'variables', default),
946 joinpath(opts_dir, default)]
947 else:
948 default_vars_files = [joinpath(opts_dir, variant_dir)]
949 existing_files = filter(isfile, default_vars_files)
950 if existing_files:
951 default_vars_file = existing_files[0]
952 sticky_vars.files.append(default_vars_file)
953 print "Variables file %s not found,\n using defaults in %s" \
954 % (current_vars_file, default_vars_file)
955 else:
956 print "Error: cannot find variables file %s or " \
957 "default file(s) %s" \
958 % (current_vars_file, ' or '.join(default_vars_files))
959 Exit(1)
960
961 # Apply current variable settings to env
962 sticky_vars.Update(env)
963
964 help_texts["local_vars"] += \
965 "Build variables for %s:\n" % variant_dir \
966 + sticky_vars.GenerateHelpText(env)
967
968 # Process variable settings.
969
970 if not have_fenv and env['USE_FENV']:
971 print "Warning: <fenv.h> not available; " \
972 "forcing USE_FENV to False in", variant_dir + "."
973 env['USE_FENV'] = False
974
975 if not env['USE_FENV']:
976 print "Warning: No IEEE FP rounding mode control in", variant_dir + "."
977 print " FP results may deviate slightly from other platforms."
978
979 if env['EFENCE']:
980 env.Append(LIBS=['efence'])
981
982 # Save sticky variable settings back to current variables file
983 sticky_vars.Save(current_vars_file, env)
984
985 if env['USE_SSE2']:
986 env.Append(CCFLAGS=['-msse2'])
987
988 # The src/SConscript file sets up the build rules in 'env' according
989 # to the configured variables. It returns a list of environments,
990 # one for each variant build (debug, opt, etc.)
991 envList = SConscript('src/SConscript', variant_dir = variant_path,
992 exports = 'env')
993
994 # Set up the regression tests for each build.
995 for e in envList:
996 SConscript('tests/SConscript',
997 variant_dir = joinpath(variant_path, 'tests', e.Label),
998 exports = { 'env' : e }, duplicate = False)
999
1000# base help text
1001Help('''
1002Usage: scons [scons options] [build variables] [target(s)]
1003
1004Extra scons options:
1005%(options)s
1006
1007Global build variables:
1008%(global_vars)s
1009
1010%(local_vars)s
1011''' % help_texts)
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