SConstruct revision 9903
1# -*- mode:python -*- 2 3# Copyright (c) 2013 ARM Limited 4# All rights reserved. 5# 6# The license below extends only to copyright in the software and shall 7# not be construed as granting a license to any other intellectual 8# property including but not limited to intellectual property relating 9# to a hardware implementation of the functionality of the software 10# licensed hereunder. You may use the software subject to the license 11# terms below provided that you ensure that this notice is replicated 12# unmodified and in its entirety in all distributions of the software, 13# modified or unmodified, in source code or in binary form. 14# 15# Copyright (c) 2011 Advanced Micro Devices, Inc. 16# Copyright (c) 2009 The Hewlett-Packard Development Company 17# Copyright (c) 2004-2005 The Regents of The University of Michigan 18# All rights reserved. 19# 20# Redistribution and use in source and binary forms, with or without 21# modification, are permitted provided that the following conditions are 22# met: redistributions of source code must retain the above copyright 23# notice, this list of conditions and the following disclaimer; 24# redistributions in binary form must reproduce the above copyright 25# notice, this list of conditions and the following disclaimer in the 26# documentation and/or other materials provided with the distribution; 27# neither the name of the copyright holders nor the names of its 28# contributors may be used to endorse or promote products derived from 29# this software without specific prior written permission. 30# 31# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 34# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 36# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 37# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 38# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 39# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 40# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 41# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42# 43# Authors: Steve Reinhardt 44# Nathan Binkert 45 46################################################### 47# 48# SCons top-level build description (SConstruct) file. 49# 50# While in this directory ('gem5'), just type 'scons' to build the default 51# configuration (see below), or type 'scons build/<CONFIG>/<binary>' 52# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for 53# the optimized full-system version). 54# 55# You can build gem5 in a different directory as long as there is a 56# 'build/<CONFIG>' somewhere along the target path. The build system 57# expects that all configs under the same build directory are being 58# built for the same host system. 59# 60# Examples: 61# 62# The following two commands are equivalent. The '-u' option tells 63# scons to search up the directory tree for this SConstruct file. 64# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug 65# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug 66# 67# The following two commands are equivalent and demonstrate building 68# in a directory outside of the source tree. The '-C' option tells 69# scons to chdir to the specified directory to find this SConstruct 70# file. 71# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug 72# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug 73# 74# You can use 'scons -H' to print scons options. If you're in this 75# 'gem5' directory (or use -u or -C to tell scons where to find this 76# file), you can use 'scons -h' to print all the gem5-specific build 77# options as well. 78# 79################################################### 80 81# Check for recent-enough Python and SCons versions. 82try: 83 # Really old versions of scons only take two options for the 84 # function, so check once without the revision and once with the 85 # revision, the first instance will fail for stuff other than 86 # 0.98, and the second will fail for 0.98.0 87 EnsureSConsVersion(0, 98) 88 EnsureSConsVersion(0, 98, 1) 89except SystemExit, e: 90 print """ 91For more details, see: 92 http://gem5.org/Dependencies 93""" 94 raise 95 96# We ensure the python version early because because python-config 97# requires python 2.5 98try: 99 EnsurePythonVersion(2, 5) 100except SystemExit, e: 101 print """ 102You can use a non-default installation of the Python interpreter by 103rearranging your PATH so that scons finds the non-default 'python' and 104'python-config' first. 105 106For more details, see: 107 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation 108""" 109 raise 110 111# Global Python includes 112import os 113import re 114import subprocess 115import sys 116 117from os import mkdir, environ 118from os.path import abspath, basename, dirname, expanduser, normpath 119from os.path import exists, isdir, isfile 120from os.path import join as joinpath, split as splitpath 121 122# SCons includes 123import SCons 124import SCons.Node 125 126extra_python_paths = [ 127 Dir('src/python').srcnode().abspath, # gem5 includes 128 Dir('ext/ply').srcnode().abspath, # ply is used by several files 129 ] 130 131sys.path[1:1] = extra_python_paths 132 133from m5.util import compareVersions, readCommand 134from m5.util.terminal import get_termcap 135 136help_texts = { 137 "options" : "", 138 "global_vars" : "", 139 "local_vars" : "" 140} 141 142Export("help_texts") 143 144 145# There's a bug in scons in that (1) by default, the help texts from 146# AddOption() are supposed to be displayed when you type 'scons -h' 147# and (2) you can override the help displayed by 'scons -h' using the 148# Help() function, but these two features are incompatible: once 149# you've overridden the help text using Help(), there's no way to get 150# at the help texts from AddOptions. See: 151# http://scons.tigris.org/issues/show_bug.cgi?id=2356 152# http://scons.tigris.org/issues/show_bug.cgi?id=2611 153# This hack lets us extract the help text from AddOptions and 154# re-inject it via Help(). Ideally someday this bug will be fixed and 155# we can just use AddOption directly. 156def AddLocalOption(*args, **kwargs): 157 col_width = 30 158 159 help = " " + ", ".join(args) 160 if "help" in kwargs: 161 length = len(help) 162 if length >= col_width: 163 help += "\n" + " " * col_width 164 else: 165 help += " " * (col_width - length) 166 help += kwargs["help"] 167 help_texts["options"] += help + "\n" 168 169 AddOption(*args, **kwargs) 170 171AddLocalOption('--colors', dest='use_colors', action='store_true', 172 help="Add color to abbreviated scons output") 173AddLocalOption('--no-colors', dest='use_colors', action='store_false', 174 help="Don't add color to abbreviated scons output") 175AddLocalOption('--default', dest='default', type='string', action='store', 176 help='Override which build_opts file to use for defaults') 177AddLocalOption('--ignore-style', dest='ignore_style', action='store_true', 178 help='Disable style checking hooks') 179AddLocalOption('--no-lto', dest='no_lto', action='store_true', 180 help='Disable Link-Time Optimization for fast') 181AddLocalOption('--update-ref', dest='update_ref', action='store_true', 182 help='Update test reference outputs') 183AddLocalOption('--verbose', dest='verbose', action='store_true', 184 help='Print full tool command lines') 185 186termcap = get_termcap(GetOption('use_colors')) 187 188######################################################################## 189# 190# Set up the main build environment. 191# 192######################################################################## 193use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH', 194 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PYTHONPATH', 195 'RANLIB', 'SWIG' ]) 196 197use_prefixes = [ 198 "M5", # M5 configuration (e.g., path to kernels) 199 "DISTCC_", # distcc (distributed compiler wrapper) configuration 200 "CCACHE_", # ccache (caching compiler wrapper) configuration 201 "CCC_", # clang static analyzer configuration 202 ] 203 204use_env = {} 205for key,val in os.environ.iteritems(): 206 if key in use_vars or \ 207 any([key.startswith(prefix) for prefix in use_prefixes]): 208 use_env[key] = val 209 210main = Environment(ENV=use_env) 211main.Decider('MD5-timestamp') 212main.root = Dir(".") # The current directory (where this file lives). 213main.srcdir = Dir("src") # The source directory 214 215main_dict_keys = main.Dictionary().keys() 216 217# Check that we have a C/C++ compiler 218if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys): 219 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)" 220 Exit(1) 221 222# Check that swig is present 223if not 'SWIG' in main_dict_keys: 224 print "swig is not installed (package swig on Ubuntu and RedHat)" 225 Exit(1) 226 227# add useful python code PYTHONPATH so it can be used by subprocesses 228# as well 229main.AppendENVPath('PYTHONPATH', extra_python_paths) 230 231######################################################################## 232# 233# Mercurial Stuff. 234# 235# If the gem5 directory is a mercurial repository, we should do some 236# extra things. 237# 238######################################################################## 239 240hgdir = main.root.Dir(".hg") 241 242mercurial_style_message = """ 243You're missing the gem5 style hook, which automatically checks your code 244against the gem5 style rules on hg commit and qrefresh commands. This 245script will now install the hook in your .hg/hgrc file. 246Press enter to continue, or ctrl-c to abort: """ 247 248mercurial_style_hook = """ 249# The following lines were automatically added by gem5/SConstruct 250# to provide the gem5 style-checking hooks 251[extensions] 252style = %s/util/style.py 253 254[hooks] 255pretxncommit.style = python:style.check_style 256pre-qrefresh.style = python:style.check_style 257# End of SConstruct additions 258 259""" % (main.root.abspath) 260 261mercurial_lib_not_found = """ 262Mercurial libraries cannot be found, ignoring style hook. If 263you are a gem5 developer, please fix this and run the style 264hook. It is important. 265""" 266 267# Check for style hook and prompt for installation if it's not there. 268# Skip this if --ignore-style was specified, there's no .hg dir to 269# install a hook in, or there's no interactive terminal to prompt. 270if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty(): 271 style_hook = True 272 try: 273 from mercurial import ui 274 ui = ui.ui() 275 ui.readconfig(hgdir.File('hgrc').abspath) 276 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \ 277 ui.config('hooks', 'pre-qrefresh.style', None) 278 except ImportError: 279 print mercurial_lib_not_found 280 281 if not style_hook: 282 print mercurial_style_message, 283 # continue unless user does ctrl-c/ctrl-d etc. 284 try: 285 raw_input() 286 except: 287 print "Input exception, exiting scons.\n" 288 sys.exit(1) 289 hgrc_path = '%s/.hg/hgrc' % main.root.abspath 290 print "Adding style hook to", hgrc_path, "\n" 291 try: 292 hgrc = open(hgrc_path, 'a') 293 hgrc.write(mercurial_style_hook) 294 hgrc.close() 295 except: 296 print "Error updating", hgrc_path 297 sys.exit(1) 298 299 300################################################### 301# 302# Figure out which configurations to set up based on the path(s) of 303# the target(s). 304# 305################################################### 306 307# Find default configuration & binary. 308Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug')) 309 310# helper function: find last occurrence of element in list 311def rfind(l, elt, offs = -1): 312 for i in range(len(l)+offs, 0, -1): 313 if l[i] == elt: 314 return i 315 raise ValueError, "element not found" 316 317# Take a list of paths (or SCons Nodes) and return a list with all 318# paths made absolute and ~-expanded. Paths will be interpreted 319# relative to the launch directory unless a different root is provided 320def makePathListAbsolute(path_list, root=GetLaunchDir()): 321 return [abspath(joinpath(root, expanduser(str(p)))) 322 for p in path_list] 323 324# Each target must have 'build' in the interior of the path; the 325# directory below this will determine the build parameters. For 326# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we 327# recognize that ALPHA_SE specifies the configuration because it 328# follow 'build' in the build path. 329 330# The funky assignment to "[:]" is needed to replace the list contents 331# in place rather than reassign the symbol to a new list, which 332# doesn't work (obviously!). 333BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS) 334 335# Generate a list of the unique build roots and configs that the 336# collected targets reference. 337variant_paths = [] 338build_root = None 339for t in BUILD_TARGETS: 340 path_dirs = t.split('/') 341 try: 342 build_top = rfind(path_dirs, 'build', -2) 343 except: 344 print "Error: no non-leaf 'build' dir found on target path", t 345 Exit(1) 346 this_build_root = joinpath('/',*path_dirs[:build_top+1]) 347 if not build_root: 348 build_root = this_build_root 349 else: 350 if this_build_root != build_root: 351 print "Error: build targets not under same build root\n"\ 352 " %s\n %s" % (build_root, this_build_root) 353 Exit(1) 354 variant_path = joinpath('/',*path_dirs[:build_top+2]) 355 if variant_path not in variant_paths: 356 variant_paths.append(variant_path) 357 358# Make sure build_root exists (might not if this is the first build there) 359if not isdir(build_root): 360 mkdir(build_root) 361main['BUILDROOT'] = build_root 362 363Export('main') 364 365main.SConsignFile(joinpath(build_root, "sconsign")) 366 367# Default duplicate option is to use hard links, but this messes up 368# when you use emacs to edit a file in the target dir, as emacs moves 369# file to file~ then copies to file, breaking the link. Symbolic 370# (soft) links work better. 371main.SetOption('duplicate', 'soft-copy') 372 373# 374# Set up global sticky variables... these are common to an entire build 375# tree (not specific to a particular build like ALPHA_SE) 376# 377 378global_vars_file = joinpath(build_root, 'variables.global') 379 380global_vars = Variables(global_vars_file, args=ARGUMENTS) 381 382global_vars.AddVariables( 383 ('CC', 'C compiler', environ.get('CC', main['CC'])), 384 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])), 385 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])), 386 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')), 387 ('BATCH', 'Use batch pool for build and tests', False), 388 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'), 389 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False), 390 ('EXTRAS', 'Add extra directories to the compilation', '') 391 ) 392 393# Update main environment with values from ARGUMENTS & global_vars_file 394global_vars.Update(main) 395help_texts["global_vars"] += global_vars.GenerateHelpText(main) 396 397# Save sticky variable settings back to current variables file 398global_vars.Save(global_vars_file, main) 399 400# Parse EXTRAS variable to build list of all directories where we're 401# look for sources etc. This list is exported as extras_dir_list. 402base_dir = main.srcdir.abspath 403if main['EXTRAS']: 404 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':')) 405else: 406 extras_dir_list = [] 407 408Export('base_dir') 409Export('extras_dir_list') 410 411# the ext directory should be on the #includes path 412main.Append(CPPPATH=[Dir('ext')]) 413 414def strip_build_path(path, env): 415 path = str(path) 416 variant_base = env['BUILDROOT'] + os.path.sep 417 if path.startswith(variant_base): 418 path = path[len(variant_base):] 419 elif path.startswith('build/'): 420 path = path[6:] 421 return path 422 423# Generate a string of the form: 424# common/path/prefix/src1, src2 -> tgt1, tgt2 425# to print while building. 426class Transform(object): 427 # all specific color settings should be here and nowhere else 428 tool_color = termcap.Normal 429 pfx_color = termcap.Yellow 430 srcs_color = termcap.Yellow + termcap.Bold 431 arrow_color = termcap.Blue + termcap.Bold 432 tgts_color = termcap.Yellow + termcap.Bold 433 434 def __init__(self, tool, max_sources=99): 435 self.format = self.tool_color + (" [%8s] " % tool) \ 436 + self.pfx_color + "%s" \ 437 + self.srcs_color + "%s" \ 438 + self.arrow_color + " -> " \ 439 + self.tgts_color + "%s" \ 440 + termcap.Normal 441 self.max_sources = max_sources 442 443 def __call__(self, target, source, env, for_signature=None): 444 # truncate source list according to max_sources param 445 source = source[0:self.max_sources] 446 def strip(f): 447 return strip_build_path(str(f), env) 448 if len(source) > 0: 449 srcs = map(strip, source) 450 else: 451 srcs = [''] 452 tgts = map(strip, target) 453 # surprisingly, os.path.commonprefix is a dumb char-by-char string 454 # operation that has nothing to do with paths. 455 com_pfx = os.path.commonprefix(srcs + tgts) 456 com_pfx_len = len(com_pfx) 457 if com_pfx: 458 # do some cleanup and sanity checking on common prefix 459 if com_pfx[-1] == ".": 460 # prefix matches all but file extension: ok 461 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o' 462 com_pfx = com_pfx[0:-1] 463 elif com_pfx[-1] == "/": 464 # common prefix is directory path: OK 465 pass 466 else: 467 src0_len = len(srcs[0]) 468 tgt0_len = len(tgts[0]) 469 if src0_len == com_pfx_len: 470 # source is a substring of target, OK 471 pass 472 elif tgt0_len == com_pfx_len: 473 # target is a substring of source, need to back up to 474 # avoid empty string on RHS of arrow 475 sep_idx = com_pfx.rfind(".") 476 if sep_idx != -1: 477 com_pfx = com_pfx[0:sep_idx] 478 else: 479 com_pfx = '' 480 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".": 481 # still splitting at file extension: ok 482 pass 483 else: 484 # probably a fluke; ignore it 485 com_pfx = '' 486 # recalculate length in case com_pfx was modified 487 com_pfx_len = len(com_pfx) 488 def fmt(files): 489 f = map(lambda s: s[com_pfx_len:], files) 490 return ', '.join(f) 491 return self.format % (com_pfx, fmt(srcs), fmt(tgts)) 492 493Export('Transform') 494 495# enable the regression script to use the termcap 496main['TERMCAP'] = termcap 497 498if GetOption('verbose'): 499 def MakeAction(action, string, *args, **kwargs): 500 return Action(action, *args, **kwargs) 501else: 502 MakeAction = Action 503 main['CCCOMSTR'] = Transform("CC") 504 main['CXXCOMSTR'] = Transform("CXX") 505 main['ASCOMSTR'] = Transform("AS") 506 main['SWIGCOMSTR'] = Transform("SWIG") 507 main['ARCOMSTR'] = Transform("AR", 0) 508 main['LINKCOMSTR'] = Transform("LINK", 0) 509 main['RANLIBCOMSTR'] = Transform("RANLIB", 0) 510 main['M4COMSTR'] = Transform("M4") 511 main['SHCCCOMSTR'] = Transform("SHCC") 512 main['SHCXXCOMSTR'] = Transform("SHCXX") 513Export('MakeAction') 514 515# Initialize the Link-Time Optimization (LTO) flags 516main['LTO_CCFLAGS'] = [] 517main['LTO_LDFLAGS'] = [] 518 519# According to the readme, tcmalloc works best if the compiler doesn't 520# assume that we're using the builtin malloc and friends. These flags 521# are compiler-specific, so we need to set them after we detect which 522# compiler we're using. 523main['TCMALLOC_CCFLAGS'] = [] 524 525CXX_version = readCommand([main['CXX'],'--version'], exception=False) 526CXX_V = readCommand([main['CXX'],'-V'], exception=False) 527 528main['GCC'] = CXX_version and CXX_version.find('g++') >= 0 529main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0 530if main['GCC'] + main['CLANG'] > 1: 531 print 'Error: How can we have two at the same time?' 532 Exit(1) 533 534# Set up default C++ compiler flags 535if main['GCC'] or main['CLANG']: 536 # As gcc and clang share many flags, do the common parts here 537 main.Append(CCFLAGS=['-pipe']) 538 main.Append(CCFLAGS=['-fno-strict-aliasing']) 539 # Enable -Wall and then disable the few warnings that we 540 # consistently violate 541 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef']) 542 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1 543 # actually use that name, so we stick with c++0x 544 main.Append(CXXFLAGS=['-std=c++0x']) 545 # Add selected sanity checks from -Wextra 546 main.Append(CXXFLAGS=['-Wmissing-field-initializers', 547 '-Woverloaded-virtual']) 548else: 549 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 550 print "Don't know what compiler options to use for your compiler." 551 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 552 print termcap.Yellow + ' version:' + termcap.Normal, 553 if not CXX_version: 554 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 555 termcap.Normal 556 else: 557 print CXX_version.replace('\n', '<nl>') 558 print " If you're trying to use a compiler other than GCC" 559 print " or clang, there appears to be something wrong with your" 560 print " environment." 561 print " " 562 print " If you are trying to use a compiler other than those listed" 563 print " above you will need to ease fix SConstruct and " 564 print " src/SConscript to support that compiler." 565 Exit(1) 566 567if main['GCC']: 568 # Check for a supported version of gcc, >= 4.4 is needed for c++0x 569 # support. See http://gcc.gnu.org/projects/cxx0x.html for details 570 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 571 if compareVersions(gcc_version, "4.4") < 0: 572 print 'Error: gcc version 4.4 or newer required.' 573 print ' Installed version:', gcc_version 574 Exit(1) 575 576 main['GCC_VERSION'] = gcc_version 577 578 # Check for versions with bugs 579 if not compareVersions(gcc_version, '4.4.1') or \ 580 not compareVersions(gcc_version, '4.4.2'): 581 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.' 582 main.Append(CCFLAGS=['-fno-tree-vectorize']) 583 584 # LTO support is only really working properly from 4.6 and beyond 585 if compareVersions(gcc_version, '4.6') >= 0: 586 # Add the appropriate Link-Time Optimization (LTO) flags 587 # unless LTO is explicitly turned off. Note that these flags 588 # are only used by the fast target. 589 if not GetOption('no_lto'): 590 # Pass the LTO flag when compiling to produce GIMPLE 591 # output, we merely create the flags here and only append 592 # them later/ 593 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 594 595 # Use the same amount of jobs for LTO as we are running 596 # scons with, we hardcode the use of the linker plugin 597 # which requires either gold or GNU ld >= 2.21 598 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'), 599 '-fuse-linker-plugin'] 600 601 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc', 602 '-fno-builtin-realloc', '-fno-builtin-free']) 603 604elif main['CLANG']: 605 # Check for a supported version of clang, >= 2.9 is needed to 606 # support similar features as gcc 4.4. See 607 # http://clang.llvm.org/cxx_status.html for details 608 clang_version_re = re.compile(".* version (\d+\.\d+)") 609 clang_version_match = clang_version_re.match(CXX_version) 610 if (clang_version_match): 611 clang_version = clang_version_match.groups()[0] 612 if compareVersions(clang_version, "2.9") < 0: 613 print 'Error: clang version 2.9 or newer required.' 614 print ' Installed version:', clang_version 615 Exit(1) 616 else: 617 print 'Error: Unable to determine clang version.' 618 Exit(1) 619 620 # clang has a few additional warnings that we disable, 621 # tautological comparisons are allowed due to unsigned integers 622 # being compared to constants that happen to be 0, and extraneous 623 # parantheses are allowed due to Ruby's printing of the AST, 624 # finally self assignments are allowed as the generated CPU code 625 # is relying on this 626 main.Append(CCFLAGS=['-Wno-tautological-compare', 627 '-Wno-parentheses', 628 '-Wno-self-assign']) 629 630 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin']) 631 632 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as 633 # opposed to libstdc++, as the later is dated. 634 if sys.platform == "darwin": 635 main.Append(CXXFLAGS=['-stdlib=libc++']) 636 main.Append(LIBS=['c++']) 637 638else: 639 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 640 print "Don't know what compiler options to use for your compiler." 641 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 642 print termcap.Yellow + ' version:' + termcap.Normal, 643 if not CXX_version: 644 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 645 termcap.Normal 646 else: 647 print CXX_version.replace('\n', '<nl>') 648 print " If you're trying to use a compiler other than GCC" 649 print " or clang, there appears to be something wrong with your" 650 print " environment." 651 print " " 652 print " If you are trying to use a compiler other than those listed" 653 print " above you will need to ease fix SConstruct and " 654 print " src/SConscript to support that compiler." 655 Exit(1) 656 657# Set up common yacc/bison flags (needed for Ruby) 658main['YACCFLAGS'] = '-d' 659main['YACCHXXFILESUFFIX'] = '.hh' 660 661# Do this after we save setting back, or else we'll tack on an 662# extra 'qdo' every time we run scons. 663if main['BATCH']: 664 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 665 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 666 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 667 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 668 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 669 670if sys.platform == 'cygwin': 671 # cygwin has some header file issues... 672 main.Append(CCFLAGS=["-Wno-uninitialized"]) 673 674# Check for the protobuf compiler 675protoc_version = readCommand([main['PROTOC'], '--version'], 676 exception='').split() 677 678# First two words should be "libprotoc x.y.z" 679if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc': 680 print termcap.Yellow + termcap.Bold + \ 681 'Warning: Protocol buffer compiler (protoc) not found.\n' + \ 682 ' Please install protobuf-compiler for tracing support.' + \ 683 termcap.Normal 684 main['PROTOC'] = False 685else: 686 # Based on the availability of the compress stream wrappers, 687 # require 2.1.0 688 min_protoc_version = '2.1.0' 689 if compareVersions(protoc_version[1], min_protoc_version) < 0: 690 print termcap.Yellow + termcap.Bold + \ 691 'Warning: protoc version', min_protoc_version, \ 692 'or newer required.\n' + \ 693 ' Installed version:', protoc_version[1], \ 694 termcap.Normal 695 main['PROTOC'] = False 696 else: 697 # Attempt to determine the appropriate include path and 698 # library path using pkg-config, that means we also need to 699 # check for pkg-config. Note that it is possible to use 700 # protobuf without the involvement of pkg-config. Later on we 701 # check go a library config check and at that point the test 702 # will fail if libprotobuf cannot be found. 703 if readCommand(['pkg-config', '--version'], exception=''): 704 try: 705 # Attempt to establish what linking flags to add for protobuf 706 # using pkg-config 707 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf') 708 except: 709 print termcap.Yellow + termcap.Bold + \ 710 'Warning: pkg-config could not get protobuf flags.' + \ 711 termcap.Normal 712 713# Check for SWIG 714if not main.has_key('SWIG'): 715 print 'Error: SWIG utility not found.' 716 print ' Please install (see http://www.swig.org) and retry.' 717 Exit(1) 718 719# Check for appropriate SWIG version 720swig_version = readCommand([main['SWIG'], '-version'], exception='').split() 721# First 3 words should be "SWIG Version x.y.z" 722if len(swig_version) < 3 or \ 723 swig_version[0] != 'SWIG' or swig_version[1] != 'Version': 724 print 'Error determining SWIG version.' 725 Exit(1) 726 727min_swig_version = '1.3.34' 728if compareVersions(swig_version[2], min_swig_version) < 0: 729 print 'Error: SWIG version', min_swig_version, 'or newer required.' 730 print ' Installed version:', swig_version[2] 731 Exit(1) 732 733# Older versions of swig do not play well with more recent versions of 734# gcc due to assumptions on implicit includes (cstddef) and use of 735# namespaces 736if main['GCC'] and compareVersions(gcc_version, '4.6') > 0 and \ 737 compareVersions(swig_version[2], '2') < 0: 738 print '\n' + termcap.Yellow + termcap.Bold + \ 739 'Warning: SWIG 1.x cause issues with gcc 4.6 and later.\n' + \ 740 termcap.Normal + \ 741 'Use SWIG 2.x to avoid assumptions on implicit includes\n' + \ 742 'and use of namespaces\n' 743 744# Set up SWIG flags & scanner 745swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS') 746main.Append(SWIGFLAGS=swig_flags) 747 748# filter out all existing swig scanners, they mess up the dependency 749# stuff for some reason 750scanners = [] 751for scanner in main['SCANNERS']: 752 skeys = scanner.skeys 753 if skeys == '.i': 754 continue 755 756 if isinstance(skeys, (list, tuple)) and '.i' in skeys: 757 continue 758 759 scanners.append(scanner) 760 761# add the new swig scanner that we like better 762from SCons.Scanner import ClassicCPP as CPPScanner 763swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")' 764scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re)) 765 766# replace the scanners list that has what we want 767main['SCANNERS'] = scanners 768 769# Add a custom Check function to the Configure context so that we can 770# figure out if the compiler adds leading underscores to global 771# variables. This is needed for the autogenerated asm files that we 772# use for embedding the python code. 773def CheckLeading(context): 774 context.Message("Checking for leading underscore in global variables...") 775 # 1) Define a global variable called x from asm so the C compiler 776 # won't change the symbol at all. 777 # 2) Declare that variable. 778 # 3) Use the variable 779 # 780 # If the compiler prepends an underscore, this will successfully 781 # link because the external symbol 'x' will be called '_x' which 782 # was defined by the asm statement. If the compiler does not 783 # prepend an underscore, this will not successfully link because 784 # '_x' will have been defined by assembly, while the C portion of 785 # the code will be trying to use 'x' 786 ret = context.TryLink(''' 787 asm(".globl _x; _x: .byte 0"); 788 extern int x; 789 int main() { return x; } 790 ''', extension=".c") 791 context.env.Append(LEADING_UNDERSCORE=ret) 792 context.Result(ret) 793 return ret 794 795# Platform-specific configuration. Note again that we assume that all 796# builds under a given build root run on the same host platform. 797conf = Configure(main, 798 conf_dir = joinpath(build_root, '.scons_config'), 799 log_file = joinpath(build_root, 'scons_config.log'), 800 custom_tests = { 'CheckLeading' : CheckLeading }) 801 802# Check for leading underscores. Don't really need to worry either 803# way so don't need to check the return code. 804conf.CheckLeading() 805 806# Check if we should compile a 64 bit binary on Mac OS X/Darwin 807try: 808 import platform 809 uname = platform.uname() 810 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 811 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 812 main.Append(CCFLAGS=['-arch', 'x86_64']) 813 main.Append(CFLAGS=['-arch', 'x86_64']) 814 main.Append(LINKFLAGS=['-arch', 'x86_64']) 815 main.Append(ASFLAGS=['-arch', 'x86_64']) 816except: 817 pass 818 819# Recent versions of scons substitute a "Null" object for Configure() 820# when configuration isn't necessary, e.g., if the "--help" option is 821# present. Unfortuantely this Null object always returns false, 822# breaking all our configuration checks. We replace it with our own 823# more optimistic null object that returns True instead. 824if not conf: 825 def NullCheck(*args, **kwargs): 826 return True 827 828 class NullConf: 829 def __init__(self, env): 830 self.env = env 831 def Finish(self): 832 return self.env 833 def __getattr__(self, mname): 834 return NullCheck 835 836 conf = NullConf(main) 837 838# Cache build files in the supplied directory. 839if main['M5_BUILD_CACHE']: 840 print 'Using build cache located at', main['M5_BUILD_CACHE'] 841 CacheDir(main['M5_BUILD_CACHE']) 842 843# Find Python include and library directories for embedding the 844# interpreter. We rely on python-config to resolve the appropriate 845# includes and linker flags. ParseConfig does not seem to understand 846# the more exotic linker flags such as -Xlinker and -export-dynamic so 847# we add them explicitly below. If you want to link in an alternate 848# version of python, see above for instructions on how to invoke 849# scons with the appropriate PATH set. 850py_includes = readCommand(['python-config', '--includes'], 851 exception='').split() 852# Strip the -I from the include folders before adding them to the 853# CPPPATH 854main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes)) 855 856# Read the linker flags and split them into libraries and other link 857# flags. The libraries are added later through the call the CheckLib. 858py_ld_flags = readCommand(['python-config', '--ldflags'], exception='').split() 859py_libs = [] 860for lib in py_ld_flags: 861 if not lib.startswith('-l'): 862 main.Append(LINKFLAGS=[lib]) 863 else: 864 lib = lib[2:] 865 if lib not in py_libs: 866 py_libs.append(lib) 867 868# verify that this stuff works 869if not conf.CheckHeader('Python.h', '<>'): 870 print "Error: can't find Python.h header in", py_includes 871 print "Install Python headers (package python-dev on Ubuntu and RedHat)" 872 Exit(1) 873 874for lib in py_libs: 875 if not conf.CheckLib(lib): 876 print "Error: can't find library %s required by python" % lib 877 Exit(1) 878 879# On Solaris you need to use libsocket for socket ops 880if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 881 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 882 print "Can't find library with socket calls (e.g. accept())" 883 Exit(1) 884 885# Check for zlib. If the check passes, libz will be automatically 886# added to the LIBS environment variable. 887if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 888 print 'Error: did not find needed zlib compression library '\ 889 'and/or zlib.h header file.' 890 print ' Please install zlib and try again.' 891 Exit(1) 892 893# If we have the protobuf compiler, also make sure we have the 894# development libraries. If the check passes, libprotobuf will be 895# automatically added to the LIBS environment variable. After 896# this, we can use the HAVE_PROTOBUF flag to determine if we have 897# got both protoc and libprotobuf available. 898main['HAVE_PROTOBUF'] = main['PROTOC'] and \ 899 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h', 900 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;') 901 902# If we have the compiler but not the library, print another warning. 903if main['PROTOC'] and not main['HAVE_PROTOBUF']: 904 print termcap.Yellow + termcap.Bold + \ 905 'Warning: did not find protocol buffer library and/or headers.\n' + \ 906 ' Please install libprotobuf-dev for tracing support.' + \ 907 termcap.Normal 908 909# Check for librt. 910have_posix_clock = \ 911 conf.CheckLibWithHeader(None, 'time.h', 'C', 912 'clock_nanosleep(0,0,NULL,NULL);') or \ 913 conf.CheckLibWithHeader('rt', 'time.h', 'C', 914 'clock_nanosleep(0,0,NULL,NULL);') 915 916have_posix_timers = \ 917 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C', 918 'timer_create(CLOCK_MONOTONIC, NULL, NULL);') 919 920if conf.CheckLib('tcmalloc'): 921 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 922elif conf.CheckLib('tcmalloc_minimal'): 923 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 924else: 925 print termcap.Yellow + termcap.Bold + \ 926 "You can get a 12% performance improvement by installing tcmalloc "\ 927 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \ 928 termcap.Normal 929 930if not have_posix_clock: 931 print "Can't find library for POSIX clocks." 932 933# Check for <fenv.h> (C99 FP environment control) 934have_fenv = conf.CheckHeader('fenv.h', '<>') 935if not have_fenv: 936 print "Warning: Header file <fenv.h> not found." 937 print " This host has no IEEE FP rounding mode control." 938 939# Check if we should enable KVM-based hardware virtualization. The API 940# we rely on exists since version 2.6.36 of the kernel, but somehow 941# the KVM_API_VERSION does not reflect the change. We test for one of 942# the types as a fall back. 943have_kvm = conf.CheckHeader('linux/kvm.h', '<>') and \ 944 conf.CheckTypeSize('struct kvm_xsave', '#include <linux/kvm.h>') != 0 945if not have_kvm: 946 print "Info: Compatible header file <linux/kvm.h> not found, " \ 947 "disabling KVM support." 948 949# Check if the requested target ISA is compatible with the host 950def is_isa_kvm_compatible(isa): 951 isa_comp_table = { 952 "arm" : ( "armv7l" ), 953 "x86" : ( "x86_64" ), 954 } 955 try: 956 import platform 957 host_isa = platform.machine() 958 except: 959 print "Warning: Failed to determine host ISA." 960 return False 961 962 return host_isa in isa_comp_table.get(isa, []) 963 964 965###################################################################### 966# 967# Finish the configuration 968# 969main = conf.Finish() 970 971###################################################################### 972# 973# Collect all non-global variables 974# 975 976# Define the universe of supported ISAs 977all_isa_list = [ ] 978Export('all_isa_list') 979 980class CpuModel(object): 981 '''The CpuModel class encapsulates everything the ISA parser needs to 982 know about a particular CPU model.''' 983 984 # Dict of available CPU model objects. Accessible as CpuModel.dict. 985 dict = {} 986 list = [] 987 defaults = [] 988 989 # Constructor. Automatically adds models to CpuModel.dict. 990 def __init__(self, name, filename, includes, strings, default=False): 991 self.name = name # name of model 992 self.filename = filename # filename for output exec code 993 self.includes = includes # include files needed in exec file 994 # The 'strings' dict holds all the per-CPU symbols we can 995 # substitute into templates etc. 996 self.strings = strings 997 998 # This cpu is enabled by default 999 self.default = default 1000 1001 # Add self to dict 1002 if name in CpuModel.dict: 1003 raise AttributeError, "CpuModel '%s' already registered" % name 1004 CpuModel.dict[name] = self 1005 CpuModel.list.append(name) 1006 1007Export('CpuModel') 1008 1009# Sticky variables get saved in the variables file so they persist from 1010# one invocation to the next (unless overridden, in which case the new 1011# value becomes sticky). 1012sticky_vars = Variables(args=ARGUMENTS) 1013Export('sticky_vars') 1014 1015# Sticky variables that should be exported 1016export_vars = [] 1017Export('export_vars') 1018 1019# For Ruby 1020all_protocols = [] 1021Export('all_protocols') 1022protocol_dirs = [] 1023Export('protocol_dirs') 1024slicc_includes = [] 1025Export('slicc_includes') 1026 1027# Walk the tree and execute all SConsopts scripts that wil add to the 1028# above variables 1029if not GetOption('verbose'): 1030 print "Reading SConsopts" 1031for bdir in [ base_dir ] + extras_dir_list: 1032 if not isdir(bdir): 1033 print "Error: directory '%s' does not exist" % bdir 1034 Exit(1) 1035 for root, dirs, files in os.walk(bdir): 1036 if 'SConsopts' in files: 1037 if GetOption('verbose'): 1038 print "Reading", joinpath(root, 'SConsopts') 1039 SConscript(joinpath(root, 'SConsopts')) 1040 1041all_isa_list.sort() 1042 1043sticky_vars.AddVariables( 1044 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 1045 ListVariable('CPU_MODELS', 'CPU models', 1046 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 1047 sorted(CpuModel.list)), 1048 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 1049 False), 1050 BoolVariable('SS_COMPATIBLE_FP', 1051 'Make floating-point results compatible with SimpleScalar', 1052 False), 1053 BoolVariable('USE_SSE2', 1054 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 1055 False), 1056 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 1057 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 1058 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False), 1059 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm), 1060 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None', 1061 all_protocols), 1062 ) 1063 1064# These variables get exported to #defines in config/*.hh (see src/SConscript). 1065export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE', 1066 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF'] 1067 1068################################################### 1069# 1070# Define a SCons builder for configuration flag headers. 1071# 1072################################################### 1073 1074# This function generates a config header file that #defines the 1075# variable symbol to the current variable setting (0 or 1). The source 1076# operands are the name of the variable and a Value node containing the 1077# value of the variable. 1078def build_config_file(target, source, env): 1079 (variable, value) = [s.get_contents() for s in source] 1080 f = file(str(target[0]), 'w') 1081 print >> f, '#define', variable, value 1082 f.close() 1083 return None 1084 1085# Combine the two functions into a scons Action object. 1086config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 1087 1088# The emitter munges the source & target node lists to reflect what 1089# we're really doing. 1090def config_emitter(target, source, env): 1091 # extract variable name from Builder arg 1092 variable = str(target[0]) 1093 # True target is config header file 1094 target = joinpath('config', variable.lower() + '.hh') 1095 val = env[variable] 1096 if isinstance(val, bool): 1097 # Force value to 0/1 1098 val = int(val) 1099 elif isinstance(val, str): 1100 val = '"' + val + '"' 1101 1102 # Sources are variable name & value (packaged in SCons Value nodes) 1103 return ([target], [Value(variable), Value(val)]) 1104 1105config_builder = Builder(emitter = config_emitter, action = config_action) 1106 1107main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 1108 1109# libelf build is shared across all configs in the build root. 1110main.SConscript('ext/libelf/SConscript', 1111 variant_dir = joinpath(build_root, 'libelf')) 1112 1113# gzstream build is shared across all configs in the build root. 1114main.SConscript('ext/gzstream/SConscript', 1115 variant_dir = joinpath(build_root, 'gzstream')) 1116 1117# libfdt build is shared across all configs in the build root. 1118main.SConscript('ext/libfdt/SConscript', 1119 variant_dir = joinpath(build_root, 'libfdt')) 1120 1121# fputils build is shared across all configs in the build root. 1122main.SConscript('ext/fputils/SConscript', 1123 variant_dir = joinpath(build_root, 'fputils')) 1124 1125################################################### 1126# 1127# This function is used to set up a directory with switching headers 1128# 1129################################################### 1130 1131main['ALL_ISA_LIST'] = all_isa_list 1132def make_switching_dir(dname, switch_headers, env): 1133 # Generate the header. target[0] is the full path of the output 1134 # header to generate. 'source' is a dummy variable, since we get the 1135 # list of ISAs from env['ALL_ISA_LIST']. 1136 def gen_switch_hdr(target, source, env): 1137 fname = str(target[0]) 1138 f = open(fname, 'w') 1139 isa = env['TARGET_ISA'].lower() 1140 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname)) 1141 f.close() 1142 1143 # Build SCons Action object. 'varlist' specifies env vars that this 1144 # action depends on; when env['ALL_ISA_LIST'] changes these actions 1145 # should get re-executed. 1146 switch_hdr_action = MakeAction(gen_switch_hdr, 1147 Transform("GENERATE"), varlist=['ALL_ISA_LIST']) 1148 1149 # Instantiate actions for each header 1150 for hdr in switch_headers: 1151 env.Command(hdr, [], switch_hdr_action) 1152Export('make_switching_dir') 1153 1154################################################### 1155# 1156# Define build environments for selected configurations. 1157# 1158################################################### 1159 1160for variant_path in variant_paths: 1161 print "Building in", variant_path 1162 1163 # Make a copy of the build-root environment to use for this config. 1164 env = main.Clone() 1165 env['BUILDDIR'] = variant_path 1166 1167 # variant_dir is the tail component of build path, and is used to 1168 # determine the build parameters (e.g., 'ALPHA_SE') 1169 (build_root, variant_dir) = splitpath(variant_path) 1170 1171 # Set env variables according to the build directory config. 1172 sticky_vars.files = [] 1173 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 1174 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 1175 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 1176 current_vars_file = joinpath(build_root, 'variables', variant_dir) 1177 if isfile(current_vars_file): 1178 sticky_vars.files.append(current_vars_file) 1179 print "Using saved variables file %s" % current_vars_file 1180 else: 1181 # Build dir-specific variables file doesn't exist. 1182 1183 # Make sure the directory is there so we can create it later 1184 opt_dir = dirname(current_vars_file) 1185 if not isdir(opt_dir): 1186 mkdir(opt_dir) 1187 1188 # Get default build variables from source tree. Variables are 1189 # normally determined by name of $VARIANT_DIR, but can be 1190 # overridden by '--default=' arg on command line. 1191 default = GetOption('default') 1192 opts_dir = joinpath(main.root.abspath, 'build_opts') 1193 if default: 1194 default_vars_files = [joinpath(build_root, 'variables', default), 1195 joinpath(opts_dir, default)] 1196 else: 1197 default_vars_files = [joinpath(opts_dir, variant_dir)] 1198 existing_files = filter(isfile, default_vars_files) 1199 if existing_files: 1200 default_vars_file = existing_files[0] 1201 sticky_vars.files.append(default_vars_file) 1202 print "Variables file %s not found,\n using defaults in %s" \ 1203 % (current_vars_file, default_vars_file) 1204 else: 1205 print "Error: cannot find variables file %s or " \ 1206 "default file(s) %s" \ 1207 % (current_vars_file, ' or '.join(default_vars_files)) 1208 Exit(1) 1209 1210 # Apply current variable settings to env 1211 sticky_vars.Update(env) 1212 1213 help_texts["local_vars"] += \ 1214 "Build variables for %s:\n" % variant_dir \ 1215 + sticky_vars.GenerateHelpText(env) 1216 1217 # Process variable settings. 1218 1219 if not have_fenv and env['USE_FENV']: 1220 print "Warning: <fenv.h> not available; " \ 1221 "forcing USE_FENV to False in", variant_dir + "." 1222 env['USE_FENV'] = False 1223 1224 if not env['USE_FENV']: 1225 print "Warning: No IEEE FP rounding mode control in", variant_dir + "." 1226 print " FP results may deviate slightly from other platforms." 1227 1228 if env['EFENCE']: 1229 env.Append(LIBS=['efence']) 1230 1231 if env['USE_KVM']: 1232 if not have_kvm: 1233 print "Warning: Can not enable KVM, host seems to lack KVM support" 1234 env['USE_KVM'] = False 1235 elif not have_posix_timers: 1236 print "Warning: Can not enable KVM, host seems to lack support " \ 1237 "for POSIX timers" 1238 env['USE_KVM'] = False 1239 elif not is_isa_kvm_compatible(env['TARGET_ISA']): 1240 print "Info: KVM support disabled due to unsupported host and " \ 1241 "target ISA combination" 1242 env['USE_KVM'] = False 1243 1244 # Save sticky variable settings back to current variables file 1245 sticky_vars.Save(current_vars_file, env) 1246 1247 if env['USE_SSE2']: 1248 env.Append(CCFLAGS=['-msse2']) 1249 1250 # The src/SConscript file sets up the build rules in 'env' according 1251 # to the configured variables. It returns a list of environments, 1252 # one for each variant build (debug, opt, etc.) 1253 envList = SConscript('src/SConscript', variant_dir = variant_path, 1254 exports = 'env') 1255 1256 # Set up the regression tests for each build. 1257 for e in envList: 1258 SConscript('tests/SConscript', 1259 variant_dir = joinpath(variant_path, 'tests', e.Label), 1260 exports = { 'env' : e }, duplicate = False) 1261 1262# base help text 1263Help(''' 1264Usage: scons [scons options] [build variables] [target(s)] 1265 1266Extra scons options: 1267%(options)s 1268 1269Global build variables: 1270%(global_vars)s 1271 1272%(local_vars)s 1273''' % help_texts) 1274