SConstruct revision 12485
1# -*- mode:python -*- 2 3# Copyright (c) 2013, 2015-2017 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# Global Python includes 82import itertools 83import os 84import re 85import shutil 86import subprocess 87import sys 88 89from os import mkdir, environ 90from os.path import abspath, basename, dirname, expanduser, normpath 91from os.path import exists, isdir, isfile 92from os.path import join as joinpath, split as splitpath 93 94# SCons includes 95import SCons 96import SCons.Node 97 98from m5.util import compareVersions, readCommand 99 100help_texts = { 101 "options" : "", 102 "global_vars" : "", 103 "local_vars" : "" 104} 105 106Export("help_texts") 107 108 109# There's a bug in scons in that (1) by default, the help texts from 110# AddOption() are supposed to be displayed when you type 'scons -h' 111# and (2) you can override the help displayed by 'scons -h' using the 112# Help() function, but these two features are incompatible: once 113# you've overridden the help text using Help(), there's no way to get 114# at the help texts from AddOptions. See: 115# http://scons.tigris.org/issues/show_bug.cgi?id=2356 116# http://scons.tigris.org/issues/show_bug.cgi?id=2611 117# This hack lets us extract the help text from AddOptions and 118# re-inject it via Help(). Ideally someday this bug will be fixed and 119# we can just use AddOption directly. 120def AddLocalOption(*args, **kwargs): 121 col_width = 30 122 123 help = " " + ", ".join(args) 124 if "help" in kwargs: 125 length = len(help) 126 if length >= col_width: 127 help += "\n" + " " * col_width 128 else: 129 help += " " * (col_width - length) 130 help += kwargs["help"] 131 help_texts["options"] += help + "\n" 132 133 AddOption(*args, **kwargs) 134 135AddLocalOption('--colors', dest='use_colors', action='store_true', 136 help="Add color to abbreviated scons output") 137AddLocalOption('--no-colors', dest='use_colors', action='store_false', 138 help="Don't add color to abbreviated scons output") 139AddLocalOption('--with-cxx-config', dest='with_cxx_config', 140 action='store_true', 141 help="Build with support for C++-based configuration") 142AddLocalOption('--default', dest='default', type='string', action='store', 143 help='Override which build_opts file to use for defaults') 144AddLocalOption('--ignore-style', dest='ignore_style', action='store_true', 145 help='Disable style checking hooks') 146AddLocalOption('--no-lto', dest='no_lto', action='store_true', 147 help='Disable Link-Time Optimization for fast') 148AddLocalOption('--force-lto', dest='force_lto', action='store_true', 149 help='Use Link-Time Optimization instead of partial linking' + 150 ' when the compiler doesn\'t support using them together.') 151AddLocalOption('--update-ref', dest='update_ref', action='store_true', 152 help='Update test reference outputs') 153AddLocalOption('--verbose', dest='verbose', action='store_true', 154 help='Print full tool command lines') 155AddLocalOption('--without-python', dest='without_python', 156 action='store_true', 157 help='Build without Python configuration support') 158AddLocalOption('--without-tcmalloc', dest='without_tcmalloc', 159 action='store_true', 160 help='Disable linking against tcmalloc') 161AddLocalOption('--with-ubsan', dest='with_ubsan', action='store_true', 162 help='Build with Undefined Behavior Sanitizer if available') 163AddLocalOption('--with-asan', dest='with_asan', action='store_true', 164 help='Build with Address Sanitizer if available') 165 166if GetOption('no_lto') and GetOption('force_lto'): 167 print '--no-lto and --force-lto are mutually exclusive' 168 Exit(1) 169 170######################################################################## 171# 172# Set up the main build environment. 173# 174######################################################################## 175 176main = Environment() 177 178from gem5_scons import Transform 179from gem5_scons.util import get_termcap 180termcap = get_termcap() 181 182main_dict_keys = main.Dictionary().keys() 183 184# Check that we have a C/C++ compiler 185if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys): 186 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)" 187 Exit(1) 188 189################################################### 190# 191# Figure out which configurations to set up based on the path(s) of 192# the target(s). 193# 194################################################### 195 196# Find default configuration & binary. 197Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug')) 198 199# helper function: find last occurrence of element in list 200def rfind(l, elt, offs = -1): 201 for i in range(len(l)+offs, 0, -1): 202 if l[i] == elt: 203 return i 204 raise ValueError, "element not found" 205 206# Take a list of paths (or SCons Nodes) and return a list with all 207# paths made absolute and ~-expanded. Paths will be interpreted 208# relative to the launch directory unless a different root is provided 209def makePathListAbsolute(path_list, root=GetLaunchDir()): 210 return [abspath(joinpath(root, expanduser(str(p)))) 211 for p in path_list] 212 213# Each target must have 'build' in the interior of the path; the 214# directory below this will determine the build parameters. For 215# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we 216# recognize that ALPHA_SE specifies the configuration because it 217# follow 'build' in the build path. 218 219# The funky assignment to "[:]" is needed to replace the list contents 220# in place rather than reassign the symbol to a new list, which 221# doesn't work (obviously!). 222BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS) 223 224# Generate a list of the unique build roots and configs that the 225# collected targets reference. 226variant_paths = [] 227build_root = None 228for t in BUILD_TARGETS: 229 path_dirs = t.split('/') 230 try: 231 build_top = rfind(path_dirs, 'build', -2) 232 except: 233 print "Error: no non-leaf 'build' dir found on target path", t 234 Exit(1) 235 this_build_root = joinpath('/',*path_dirs[:build_top+1]) 236 if not build_root: 237 build_root = this_build_root 238 else: 239 if this_build_root != build_root: 240 print "Error: build targets not under same build root\n"\ 241 " %s\n %s" % (build_root, this_build_root) 242 Exit(1) 243 variant_path = joinpath('/',*path_dirs[:build_top+2]) 244 if variant_path not in variant_paths: 245 variant_paths.append(variant_path) 246 247# Make sure build_root exists (might not if this is the first build there) 248if not isdir(build_root): 249 mkdir(build_root) 250main['BUILDROOT'] = build_root 251 252Export('main') 253 254main.SConsignFile(joinpath(build_root, "sconsign")) 255 256# Default duplicate option is to use hard links, but this messes up 257# when you use emacs to edit a file in the target dir, as emacs moves 258# file to file~ then copies to file, breaking the link. Symbolic 259# (soft) links work better. 260main.SetOption('duplicate', 'soft-copy') 261 262# 263# Set up global sticky variables... these are common to an entire build 264# tree (not specific to a particular build like ALPHA_SE) 265# 266 267global_vars_file = joinpath(build_root, 'variables.global') 268 269global_vars = Variables(global_vars_file, args=ARGUMENTS) 270 271global_vars.AddVariables( 272 ('CC', 'C compiler', environ.get('CC', main['CC'])), 273 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])), 274 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')), 275 ('BATCH', 'Use batch pool for build and tests', False), 276 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'), 277 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False), 278 ('EXTRAS', 'Add extra directories to the compilation', '') 279 ) 280 281# Update main environment with values from ARGUMENTS & global_vars_file 282global_vars.Update(main) 283help_texts["global_vars"] += global_vars.GenerateHelpText(main) 284 285# Save sticky variable settings back to current variables file 286global_vars.Save(global_vars_file, main) 287 288# Parse EXTRAS variable to build list of all directories where we're 289# look for sources etc. This list is exported as extras_dir_list. 290base_dir = main.srcdir.abspath 291if main['EXTRAS']: 292 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':')) 293else: 294 extras_dir_list = [] 295 296Export('base_dir') 297Export('extras_dir_list') 298 299# the ext directory should be on the #includes path 300main.Append(CPPPATH=[Dir('ext')]) 301 302# Add shared top-level headers 303main.Prepend(CPPPATH=Dir('include')) 304 305if GetOption('verbose'): 306 def MakeAction(action, string, *args, **kwargs): 307 return Action(action, *args, **kwargs) 308else: 309 MakeAction = Action 310 main['CCCOMSTR'] = Transform("CC") 311 main['CXXCOMSTR'] = Transform("CXX") 312 main['ASCOMSTR'] = Transform("AS") 313 main['ARCOMSTR'] = Transform("AR", 0) 314 main['LINKCOMSTR'] = Transform("LINK", 0) 315 main['SHLINKCOMSTR'] = Transform("SHLINK", 0) 316 main['RANLIBCOMSTR'] = Transform("RANLIB", 0) 317 main['M4COMSTR'] = Transform("M4") 318 main['SHCCCOMSTR'] = Transform("SHCC") 319 main['SHCXXCOMSTR'] = Transform("SHCXX") 320Export('MakeAction') 321 322# Initialize the Link-Time Optimization (LTO) flags 323main['LTO_CCFLAGS'] = [] 324main['LTO_LDFLAGS'] = [] 325 326# According to the readme, tcmalloc works best if the compiler doesn't 327# assume that we're using the builtin malloc and friends. These flags 328# are compiler-specific, so we need to set them after we detect which 329# compiler we're using. 330main['TCMALLOC_CCFLAGS'] = [] 331 332CXX_version = readCommand([main['CXX'],'--version'], exception=False) 333CXX_V = readCommand([main['CXX'],'-V'], exception=False) 334 335main['GCC'] = CXX_version and CXX_version.find('g++') >= 0 336main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0 337if main['GCC'] + main['CLANG'] > 1: 338 print 'Error: How can we have two at the same time?' 339 Exit(1) 340 341# Set up default C++ compiler flags 342if main['GCC'] or main['CLANG']: 343 # As gcc and clang share many flags, do the common parts here 344 main.Append(CCFLAGS=['-pipe']) 345 main.Append(CCFLAGS=['-fno-strict-aliasing']) 346 # Enable -Wall and -Wextra and then disable the few warnings that 347 # we consistently violate 348 main.Append(CCFLAGS=['-Wall', '-Wundef', '-Wextra', 349 '-Wno-sign-compare', '-Wno-unused-parameter']) 350 # We always compile using C++11 351 main.Append(CXXFLAGS=['-std=c++11']) 352 if sys.platform.startswith('freebsd'): 353 main.Append(CCFLAGS=['-I/usr/local/include']) 354 main.Append(CXXFLAGS=['-I/usr/local/include']) 355 356 main['FILTER_PSHLINKFLAGS'] = lambda x: str(x).replace(' -shared', '') 357 main['PSHLINKFLAGS'] = main.subst('${FILTER_PSHLINKFLAGS(SHLINKFLAGS)}') 358 main['PLINKFLAGS'] = main.subst('${LINKFLAGS}') 359 shared_partial_flags = ['-r', '-nostdlib'] 360 main.Append(PSHLINKFLAGS=shared_partial_flags) 361 main.Append(PLINKFLAGS=shared_partial_flags) 362 363 # Treat warnings as errors but white list some warnings that we 364 # want to allow (e.g., deprecation warnings). 365 main.Append(CCFLAGS=['-Werror', 366 '-Wno-error=deprecated-declarations', 367 '-Wno-error=deprecated', 368 ]) 369else: 370 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 371 print "Don't know what compiler options to use for your compiler." 372 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 373 print termcap.Yellow + ' version:' + termcap.Normal, 374 if not CXX_version: 375 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 376 termcap.Normal 377 else: 378 print CXX_version.replace('\n', '<nl>') 379 print " If you're trying to use a compiler other than GCC" 380 print " or clang, there appears to be something wrong with your" 381 print " environment." 382 print " " 383 print " If you are trying to use a compiler other than those listed" 384 print " above you will need to ease fix SConstruct and " 385 print " src/SConscript to support that compiler." 386 Exit(1) 387 388if main['GCC']: 389 # Check for a supported version of gcc. >= 4.8 is chosen for its 390 # level of c++11 support. See 391 # http://gcc.gnu.org/projects/cxx0x.html for details. 392 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 393 if compareVersions(gcc_version, "4.8") < 0: 394 print 'Error: gcc version 4.8 or newer required.' 395 print ' Installed version:', gcc_version 396 Exit(1) 397 398 main['GCC_VERSION'] = gcc_version 399 400 if compareVersions(gcc_version, '4.9') >= 0: 401 # Incremental linking with LTO is currently broken in gcc versions 402 # 4.9 and above. A version where everything works completely hasn't 403 # yet been identified. 404 # 405 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548 406 main['BROKEN_INCREMENTAL_LTO'] = True 407 if compareVersions(gcc_version, '6.0') >= 0: 408 # gcc versions 6.0 and greater accept an -flinker-output flag which 409 # selects what type of output the linker should generate. This is 410 # necessary for incremental lto to work, but is also broken in 411 # current versions of gcc. It may not be necessary in future 412 # versions. We add it here since it might be, and as a reminder that 413 # it exists. It's excluded if lto is being forced. 414 # 415 # https://gcc.gnu.org/gcc-6/changes.html 416 # https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03161.html 417 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866 418 if not GetOption('force_lto'): 419 main.Append(PSHLINKFLAGS='-flinker-output=rel') 420 main.Append(PLINKFLAGS='-flinker-output=rel') 421 422 # gcc from version 4.8 and above generates "rep; ret" instructions 423 # to avoid performance penalties on certain AMD chips. Older 424 # assemblers detect this as an error, "Error: expecting string 425 # instruction after `rep'" 426 as_version_raw = readCommand([main['AS'], '-v', '/dev/null', 427 '-o', '/dev/null'], 428 exception=False).split() 429 430 # version strings may contain extra distro-specific 431 # qualifiers, so play it safe and keep only what comes before 432 # the first hyphen 433 as_version = as_version_raw[-1].split('-')[0] if as_version_raw else None 434 435 if not as_version or compareVersions(as_version, "2.23") < 0: 436 print termcap.Yellow + termcap.Bold + \ 437 'Warning: This combination of gcc and binutils have' + \ 438 ' known incompatibilities.\n' + \ 439 ' If you encounter build problems, please update ' + \ 440 'binutils to 2.23.' + \ 441 termcap.Normal 442 443 # Make sure we warn if the user has requested to compile with the 444 # Undefined Benahvior Sanitizer and this version of gcc does not 445 # support it. 446 if GetOption('with_ubsan') and \ 447 compareVersions(gcc_version, '4.9') < 0: 448 print termcap.Yellow + termcap.Bold + \ 449 'Warning: UBSan is only supported using gcc 4.9 and later.' + \ 450 termcap.Normal 451 452 disable_lto = GetOption('no_lto') 453 if not disable_lto and main.get('BROKEN_INCREMENTAL_LTO', False) and \ 454 not GetOption('force_lto'): 455 print termcap.Yellow + termcap.Bold + \ 456 'Warning: Your compiler doesn\'t support incremental linking' + \ 457 ' and lto at the same time, so lto is being disabled. To force' + \ 458 ' lto on anyway, use the --force-lto option. That will disable' + \ 459 ' partial linking.' + \ 460 termcap.Normal 461 disable_lto = True 462 463 # Add the appropriate Link-Time Optimization (LTO) flags 464 # unless LTO is explicitly turned off. Note that these flags 465 # are only used by the fast target. 466 if not disable_lto: 467 # Pass the LTO flag when compiling to produce GIMPLE 468 # output, we merely create the flags here and only append 469 # them later 470 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 471 472 # Use the same amount of jobs for LTO as we are running 473 # scons with 474 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 475 476 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc', 477 '-fno-builtin-realloc', '-fno-builtin-free']) 478 479 # add option to check for undeclared overrides 480 if compareVersions(gcc_version, "5.0") > 0: 481 main.Append(CCFLAGS=['-Wno-error=suggest-override']) 482 483 # The address sanitizer is available for gcc >= 4.8 484 if GetOption('with_asan'): 485 if GetOption('with_ubsan') and \ 486 compareVersions(env['GCC_VERSION'], '4.9') >= 0: 487 env.Append(CCFLAGS=['-fsanitize=address,undefined', 488 '-fno-omit-frame-pointer'], 489 LINKFLAGS='-fsanitize=address,undefined') 490 else: 491 env.Append(CCFLAGS=['-fsanitize=address', 492 '-fno-omit-frame-pointer'], 493 LINKFLAGS='-fsanitize=address') 494 # Only gcc >= 4.9 supports UBSan, so check both the version 495 # and the command-line option before adding the compiler and 496 # linker flags. 497 elif GetOption('with_ubsan') and \ 498 compareVersions(env['GCC_VERSION'], '4.9') >= 0: 499 env.Append(CCFLAGS='-fsanitize=undefined') 500 env.Append(LINKFLAGS='-fsanitize=undefined') 501 502elif main['CLANG']: 503 # Check for a supported version of clang, >= 3.1 is needed to 504 # support similar features as gcc 4.8. See 505 # http://clang.llvm.org/cxx_status.html for details 506 clang_version_re = re.compile(".* version (\d+\.\d+)") 507 clang_version_match = clang_version_re.search(CXX_version) 508 if (clang_version_match): 509 clang_version = clang_version_match.groups()[0] 510 if compareVersions(clang_version, "3.1") < 0: 511 print 'Error: clang version 3.1 or newer required.' 512 print ' Installed version:', clang_version 513 Exit(1) 514 else: 515 print 'Error: Unable to determine clang version.' 516 Exit(1) 517 518 # clang has a few additional warnings that we disable, extraneous 519 # parantheses are allowed due to Ruby's printing of the AST, 520 # finally self assignments are allowed as the generated CPU code 521 # is relying on this 522 main.Append(CCFLAGS=['-Wno-parentheses', 523 '-Wno-self-assign', 524 # Some versions of libstdc++ (4.8?) seem to 525 # use struct hash and class hash 526 # interchangeably. 527 '-Wno-mismatched-tags', 528 ]) 529 530 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin']) 531 532 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as 533 # opposed to libstdc++, as the later is dated. 534 if sys.platform == "darwin": 535 main.Append(CXXFLAGS=['-stdlib=libc++']) 536 main.Append(LIBS=['c++']) 537 538 # On FreeBSD we need libthr. 539 if sys.platform.startswith('freebsd'): 540 main.Append(LIBS=['thr']) 541 542 # We require clang >= 3.1, so there is no need to check any 543 # versions here. 544 if GetOption('with_ubsan'): 545 if GetOption('with_asan'): 546 env.Append(CCFLAGS=['-fsanitize=address,undefined', 547 '-fno-omit-frame-pointer'], 548 LINKFLAGS='-fsanitize=address,undefined') 549 else: 550 env.Append(CCFLAGS='-fsanitize=undefined', 551 LINKFLAGS='-fsanitize=undefined') 552 553 elif GetOption('with_asan'): 554 env.Append(CCFLAGS=['-fsanitize=address', 555 '-fno-omit-frame-pointer'], 556 LINKFLAGS='-fsanitize=address') 557 558else: 559 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 560 print "Don't know what compiler options to use for your compiler." 561 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 562 print termcap.Yellow + ' version:' + termcap.Normal, 563 if not CXX_version: 564 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 565 termcap.Normal 566 else: 567 print CXX_version.replace('\n', '<nl>') 568 print " If you're trying to use a compiler other than GCC" 569 print " or clang, there appears to be something wrong with your" 570 print " environment." 571 print " " 572 print " If you are trying to use a compiler other than those listed" 573 print " above you will need to ease fix SConstruct and " 574 print " src/SConscript to support that compiler." 575 Exit(1) 576 577# Set up common yacc/bison flags (needed for Ruby) 578main['YACCFLAGS'] = '-d' 579main['YACCHXXFILESUFFIX'] = '.hh' 580 581# Do this after we save setting back, or else we'll tack on an 582# extra 'qdo' every time we run scons. 583if main['BATCH']: 584 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 585 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 586 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 587 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 588 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 589 590if sys.platform == 'cygwin': 591 # cygwin has some header file issues... 592 main.Append(CCFLAGS=["-Wno-uninitialized"]) 593 594# Check for the protobuf compiler 595protoc_version = readCommand([main['PROTOC'], '--version'], 596 exception='').split() 597 598# First two words should be "libprotoc x.y.z" 599if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc': 600 print termcap.Yellow + termcap.Bold + \ 601 'Warning: Protocol buffer compiler (protoc) not found.\n' + \ 602 ' Please install protobuf-compiler for tracing support.' + \ 603 termcap.Normal 604 main['PROTOC'] = False 605else: 606 # Based on the availability of the compress stream wrappers, 607 # require 2.1.0 608 min_protoc_version = '2.1.0' 609 if compareVersions(protoc_version[1], min_protoc_version) < 0: 610 print termcap.Yellow + termcap.Bold + \ 611 'Warning: protoc version', min_protoc_version, \ 612 'or newer required.\n' + \ 613 ' Installed version:', protoc_version[1], \ 614 termcap.Normal 615 main['PROTOC'] = False 616 else: 617 # Attempt to determine the appropriate include path and 618 # library path using pkg-config, that means we also need to 619 # check for pkg-config. Note that it is possible to use 620 # protobuf without the involvement of pkg-config. Later on we 621 # check go a library config check and at that point the test 622 # will fail if libprotobuf cannot be found. 623 if readCommand(['pkg-config', '--version'], exception=''): 624 try: 625 # Attempt to establish what linking flags to add for protobuf 626 # using pkg-config 627 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf') 628 except: 629 print termcap.Yellow + termcap.Bold + \ 630 'Warning: pkg-config could not get protobuf flags.' + \ 631 termcap.Normal 632 633 634# Check for 'timeout' from GNU coreutils. If present, regressions will 635# be run with a time limit. We require version 8.13 since we rely on 636# support for the '--foreground' option. 637if sys.platform.startswith('freebsd'): 638 timeout_lines = readCommand(['gtimeout', '--version'], 639 exception='').splitlines() 640else: 641 timeout_lines = readCommand(['timeout', '--version'], 642 exception='').splitlines() 643# Get the first line and tokenize it 644timeout_version = timeout_lines[0].split() if timeout_lines else [] 645main['TIMEOUT'] = timeout_version and \ 646 compareVersions(timeout_version[-1], '8.13') >= 0 647 648# Add a custom Check function to test for structure members. 649def CheckMember(context, include, decl, member, include_quotes="<>"): 650 context.Message("Checking for member %s in %s..." % 651 (member, decl)) 652 text = """ 653#include %(header)s 654int main(){ 655 %(decl)s test; 656 (void)test.%(member)s; 657 return 0; 658}; 659""" % { "header" : include_quotes[0] + include + include_quotes[1], 660 "decl" : decl, 661 "member" : member, 662 } 663 664 ret = context.TryCompile(text, extension=".cc") 665 context.Result(ret) 666 return ret 667 668# Platform-specific configuration. Note again that we assume that all 669# builds under a given build root run on the same host platform. 670conf = Configure(main, 671 conf_dir = joinpath(build_root, '.scons_config'), 672 log_file = joinpath(build_root, 'scons_config.log'), 673 custom_tests = { 674 'CheckMember' : CheckMember, 675 }) 676 677# Check if we should compile a 64 bit binary on Mac OS X/Darwin 678try: 679 import platform 680 uname = platform.uname() 681 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 682 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 683 main.Append(CCFLAGS=['-arch', 'x86_64']) 684 main.Append(CFLAGS=['-arch', 'x86_64']) 685 main.Append(LINKFLAGS=['-arch', 'x86_64']) 686 main.Append(ASFLAGS=['-arch', 'x86_64']) 687except: 688 pass 689 690# Recent versions of scons substitute a "Null" object for Configure() 691# when configuration isn't necessary, e.g., if the "--help" option is 692# present. Unfortuantely this Null object always returns false, 693# breaking all our configuration checks. We replace it with our own 694# more optimistic null object that returns True instead. 695if not conf: 696 def NullCheck(*args, **kwargs): 697 return True 698 699 class NullConf: 700 def __init__(self, env): 701 self.env = env 702 def Finish(self): 703 return self.env 704 def __getattr__(self, mname): 705 return NullCheck 706 707 conf = NullConf(main) 708 709# Cache build files in the supplied directory. 710if main['M5_BUILD_CACHE']: 711 print 'Using build cache located at', main['M5_BUILD_CACHE'] 712 CacheDir(main['M5_BUILD_CACHE']) 713 714main['USE_PYTHON'] = not GetOption('without_python') 715if main['USE_PYTHON']: 716 # Find Python include and library directories for embedding the 717 # interpreter. We rely on python-config to resolve the appropriate 718 # includes and linker flags. ParseConfig does not seem to understand 719 # the more exotic linker flags such as -Xlinker and -export-dynamic so 720 # we add them explicitly below. If you want to link in an alternate 721 # version of python, see above for instructions on how to invoke 722 # scons with the appropriate PATH set. 723 # 724 # First we check if python2-config exists, else we use python-config 725 python_config = readCommand(['which', 'python2-config'], 726 exception='').strip() 727 if not os.path.exists(python_config): 728 python_config = readCommand(['which', 'python-config'], 729 exception='').strip() 730 py_includes = readCommand([python_config, '--includes'], 731 exception='').split() 732 # Strip the -I from the include folders before adding them to the 733 # CPPPATH 734 main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes)) 735 736 # Read the linker flags and split them into libraries and other link 737 # flags. The libraries are added later through the call the CheckLib. 738 py_ld_flags = readCommand([python_config, '--ldflags'], 739 exception='').split() 740 py_libs = [] 741 for lib in py_ld_flags: 742 if not lib.startswith('-l'): 743 main.Append(LINKFLAGS=[lib]) 744 else: 745 lib = lib[2:] 746 if lib not in py_libs: 747 py_libs.append(lib) 748 749 # verify that this stuff works 750 if not conf.CheckHeader('Python.h', '<>'): 751 print "Error: can't find Python.h header in", py_includes 752 print "Install Python headers (package python-dev on Ubuntu and RedHat)" 753 Exit(1) 754 755 for lib in py_libs: 756 if not conf.CheckLib(lib): 757 print "Error: can't find library %s required by python" % lib 758 Exit(1) 759 760# On Solaris you need to use libsocket for socket ops 761if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 762 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 763 print "Can't find library with socket calls (e.g. accept())" 764 Exit(1) 765 766# Check for zlib. If the check passes, libz will be automatically 767# added to the LIBS environment variable. 768if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 769 print 'Error: did not find needed zlib compression library '\ 770 'and/or zlib.h header file.' 771 print ' Please install zlib and try again.' 772 Exit(1) 773 774# If we have the protobuf compiler, also make sure we have the 775# development libraries. If the check passes, libprotobuf will be 776# automatically added to the LIBS environment variable. After 777# this, we can use the HAVE_PROTOBUF flag to determine if we have 778# got both protoc and libprotobuf available. 779main['HAVE_PROTOBUF'] = main['PROTOC'] and \ 780 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h', 781 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;') 782 783# If we have the compiler but not the library, print another warning. 784if main['PROTOC'] and not main['HAVE_PROTOBUF']: 785 print termcap.Yellow + termcap.Bold + \ 786 'Warning: did not find protocol buffer library and/or headers.\n' + \ 787 ' Please install libprotobuf-dev for tracing support.' + \ 788 termcap.Normal 789 790# Check for librt. 791have_posix_clock = \ 792 conf.CheckLibWithHeader(None, 'time.h', 'C', 793 'clock_nanosleep(0,0,NULL,NULL);') or \ 794 conf.CheckLibWithHeader('rt', 'time.h', 'C', 795 'clock_nanosleep(0,0,NULL,NULL);') 796 797have_posix_timers = \ 798 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C', 799 'timer_create(CLOCK_MONOTONIC, NULL, NULL);') 800 801if not GetOption('without_tcmalloc'): 802 if conf.CheckLib('tcmalloc'): 803 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 804 elif conf.CheckLib('tcmalloc_minimal'): 805 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 806 else: 807 print termcap.Yellow + termcap.Bold + \ 808 "You can get a 12% performance improvement by "\ 809 "installing tcmalloc (libgoogle-perftools-dev package "\ 810 "on Ubuntu or RedHat)." + termcap.Normal 811 812 813# Detect back trace implementations. The last implementation in the 814# list will be used by default. 815backtrace_impls = [ "none" ] 816 817backtrace_checker = 'char temp;' + \ 818 ' backtrace_symbols_fd((void*)&temp, 0, 0);' 819if conf.CheckLibWithHeader(None, 'execinfo.h', 'C', backtrace_checker): 820 backtrace_impls.append("glibc") 821elif conf.CheckLibWithHeader('execinfo', 'execinfo.h', 'C', 822 backtrace_checker): 823 # NetBSD and FreeBSD need libexecinfo. 824 backtrace_impls.append("glibc") 825 main.Append(LIBS=['execinfo']) 826 827if backtrace_impls[-1] == "none": 828 default_backtrace_impl = "none" 829 print termcap.Yellow + termcap.Bold + \ 830 "No suitable back trace implementation found." + \ 831 termcap.Normal 832 833if not have_posix_clock: 834 print "Can't find library for POSIX clocks." 835 836# Check for <fenv.h> (C99 FP environment control) 837have_fenv = conf.CheckHeader('fenv.h', '<>') 838if not have_fenv: 839 print "Warning: Header file <fenv.h> not found." 840 print " This host has no IEEE FP rounding mode control." 841 842# Check for <png.h> (libpng library needed if wanting to dump 843# frame buffer image in png format) 844have_png = conf.CheckHeader('png.h', '<>') 845if not have_png: 846 print "Warning: Header file <png.h> not found." 847 print " This host has no libpng library." 848 print " Disabling support for PNG framebuffers." 849 850# Check if we should enable KVM-based hardware virtualization. The API 851# we rely on exists since version 2.6.36 of the kernel, but somehow 852# the KVM_API_VERSION does not reflect the change. We test for one of 853# the types as a fall back. 854have_kvm = conf.CheckHeader('linux/kvm.h', '<>') 855if not have_kvm: 856 print "Info: Compatible header file <linux/kvm.h> not found, " \ 857 "disabling KVM support." 858 859# Check if the TUN/TAP driver is available. 860have_tuntap = conf.CheckHeader('linux/if_tun.h', '<>') 861if not have_tuntap: 862 print "Info: Compatible header file <linux/if_tun.h> not found." 863 864# x86 needs support for xsave. We test for the structure here since we 865# won't be able to run new tests by the time we know which ISA we're 866# targeting. 867have_kvm_xsave = conf.CheckTypeSize('struct kvm_xsave', 868 '#include <linux/kvm.h>') != 0 869 870# Check if the requested target ISA is compatible with the host 871def is_isa_kvm_compatible(isa): 872 try: 873 import platform 874 host_isa = platform.machine() 875 except: 876 print "Warning: Failed to determine host ISA." 877 return False 878 879 if not have_posix_timers: 880 print "Warning: Can not enable KVM, host seems to lack support " \ 881 "for POSIX timers" 882 return False 883 884 if isa == "arm": 885 return host_isa in ( "armv7l", "aarch64" ) 886 elif isa == "x86": 887 if host_isa != "x86_64": 888 return False 889 890 if not have_kvm_xsave: 891 print "KVM on x86 requires xsave support in kernel headers." 892 return False 893 894 return True 895 else: 896 return False 897 898 899# Check if the exclude_host attribute is available. We want this to 900# get accurate instruction counts in KVM. 901main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember( 902 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host') 903 904 905###################################################################### 906# 907# Finish the configuration 908# 909main = conf.Finish() 910 911###################################################################### 912# 913# Collect all non-global variables 914# 915 916# Define the universe of supported ISAs 917all_isa_list = [ ] 918all_gpu_isa_list = [ ] 919Export('all_isa_list') 920Export('all_gpu_isa_list') 921 922class CpuModel(object): 923 '''The CpuModel class encapsulates everything the ISA parser needs to 924 know about a particular CPU model.''' 925 926 # Dict of available CPU model objects. Accessible as CpuModel.dict. 927 dict = {} 928 929 # Constructor. Automatically adds models to CpuModel.dict. 930 def __init__(self, name, default=False): 931 self.name = name # name of model 932 933 # This cpu is enabled by default 934 self.default = default 935 936 # Add self to dict 937 if name in CpuModel.dict: 938 raise AttributeError, "CpuModel '%s' already registered" % name 939 CpuModel.dict[name] = self 940 941Export('CpuModel') 942 943# Sticky variables get saved in the variables file so they persist from 944# one invocation to the next (unless overridden, in which case the new 945# value becomes sticky). 946sticky_vars = Variables(args=ARGUMENTS) 947Export('sticky_vars') 948 949# Sticky variables that should be exported 950export_vars = [] 951Export('export_vars') 952 953# For Ruby 954all_protocols = [] 955Export('all_protocols') 956protocol_dirs = [] 957Export('protocol_dirs') 958slicc_includes = [] 959Export('slicc_includes') 960 961# Walk the tree and execute all SConsopts scripts that wil add to the 962# above variables 963if GetOption('verbose'): 964 print "Reading SConsopts" 965for bdir in [ base_dir ] + extras_dir_list: 966 if not isdir(bdir): 967 print "Error: directory '%s' does not exist" % bdir 968 Exit(1) 969 for root, dirs, files in os.walk(bdir): 970 if 'SConsopts' in files: 971 if GetOption('verbose'): 972 print "Reading", joinpath(root, 'SConsopts') 973 SConscript(joinpath(root, 'SConsopts')) 974 975all_isa_list.sort() 976all_gpu_isa_list.sort() 977 978sticky_vars.AddVariables( 979 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 980 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'hsail', all_gpu_isa_list), 981 ListVariable('CPU_MODELS', 'CPU models', 982 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 983 sorted(CpuModel.dict.keys())), 984 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 985 False), 986 BoolVariable('SS_COMPATIBLE_FP', 987 'Make floating-point results compatible with SimpleScalar', 988 False), 989 BoolVariable('USE_SSE2', 990 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 991 False), 992 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 993 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 994 BoolVariable('USE_PNG', 'Enable support for PNG images', have_png), 995 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', 996 False), 997 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', 998 have_kvm), 999 BoolVariable('USE_TUNTAP', 1000 'Enable using a tap device to bridge to the host network', 1001 have_tuntap), 1002 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False), 1003 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None', 1004 all_protocols), 1005 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation', 1006 backtrace_impls[-1], backtrace_impls) 1007 ) 1008 1009# These variables get exported to #defines in config/*.hh (see src/SConscript). 1010export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'TARGET_GPU_ISA', 1011 'CP_ANNOTATE', 'USE_POSIX_CLOCK', 'USE_KVM', 'USE_TUNTAP', 1012 'PROTOCOL', 'HAVE_PROTOBUF', 'HAVE_PERF_ATTR_EXCLUDE_HOST', 1013 'USE_PNG'] 1014 1015################################################### 1016# 1017# Define a SCons builder for configuration flag headers. 1018# 1019################################################### 1020 1021# This function generates a config header file that #defines the 1022# variable symbol to the current variable setting (0 or 1). The source 1023# operands are the name of the variable and a Value node containing the 1024# value of the variable. 1025def build_config_file(target, source, env): 1026 (variable, value) = [s.get_contents() for s in source] 1027 f = file(str(target[0]), 'w') 1028 print >> f, '#define', variable, value 1029 f.close() 1030 return None 1031 1032# Combine the two functions into a scons Action object. 1033config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 1034 1035# The emitter munges the source & target node lists to reflect what 1036# we're really doing. 1037def config_emitter(target, source, env): 1038 # extract variable name from Builder arg 1039 variable = str(target[0]) 1040 # True target is config header file 1041 target = joinpath('config', variable.lower() + '.hh') 1042 val = env[variable] 1043 if isinstance(val, bool): 1044 # Force value to 0/1 1045 val = int(val) 1046 elif isinstance(val, str): 1047 val = '"' + val + '"' 1048 1049 # Sources are variable name & value (packaged in SCons Value nodes) 1050 return ([target], [Value(variable), Value(val)]) 1051 1052config_builder = Builder(emitter = config_emitter, action = config_action) 1053 1054main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 1055 1056################################################### 1057# 1058# Builders for static and shared partially linked object files. 1059# 1060################################################### 1061 1062partial_static_builder = Builder(action=SCons.Defaults.LinkAction, 1063 src_suffix='$OBJSUFFIX', 1064 src_builder=['StaticObject', 'Object'], 1065 LINKFLAGS='$PLINKFLAGS', 1066 LIBS='') 1067 1068def partial_shared_emitter(target, source, env): 1069 for tgt in target: 1070 tgt.attributes.shared = 1 1071 return (target, source) 1072partial_shared_builder = Builder(action=SCons.Defaults.ShLinkAction, 1073 emitter=partial_shared_emitter, 1074 src_suffix='$SHOBJSUFFIX', 1075 src_builder='SharedObject', 1076 SHLINKFLAGS='$PSHLINKFLAGS', 1077 LIBS='') 1078 1079main.Append(BUILDERS = { 'PartialShared' : partial_shared_builder, 1080 'PartialStatic' : partial_static_builder }) 1081 1082# builds in ext are shared across all configs in the build root. 1083ext_dir = abspath(joinpath(str(main.root), 'ext')) 1084ext_build_dirs = [] 1085for root, dirs, files in os.walk(ext_dir): 1086 if 'SConscript' in files: 1087 build_dir = os.path.relpath(root, ext_dir) 1088 ext_build_dirs.append(build_dir) 1089 main.SConscript(joinpath(root, 'SConscript'), 1090 variant_dir=joinpath(build_root, build_dir)) 1091 1092main.Prepend(CPPPATH=Dir('ext/pybind11/include/')) 1093 1094################################################### 1095# 1096# This builder and wrapper method are used to set up a directory with 1097# switching headers. Those are headers which are in a generic location and 1098# that include more specific headers from a directory chosen at build time 1099# based on the current build settings. 1100# 1101################################################### 1102 1103def build_switching_header(target, source, env): 1104 path = str(target[0]) 1105 subdir = str(source[0]) 1106 dp, fp = os.path.split(path) 1107 dp = os.path.relpath(os.path.realpath(dp), 1108 os.path.realpath(env['BUILDDIR'])) 1109 with open(path, 'w') as hdr: 1110 print >>hdr, '#include "%s/%s/%s"' % (dp, subdir, fp) 1111 1112switching_header_action = MakeAction(build_switching_header, 1113 Transform('GENERATE')) 1114 1115switching_header_builder = Builder(action=switching_header_action, 1116 source_factory=Value, 1117 single_source=True) 1118 1119main.Append(BUILDERS = { 'SwitchingHeader': switching_header_builder }) 1120 1121def switching_headers(self, headers, source): 1122 for header in headers: 1123 self.SwitchingHeader(header, source) 1124 1125main.AddMethod(switching_headers, 'SwitchingHeaders') 1126 1127################################################### 1128# 1129# Define build environments for selected configurations. 1130# 1131################################################### 1132 1133for variant_path in variant_paths: 1134 if not GetOption('silent'): 1135 print "Building in", variant_path 1136 1137 # Make a copy of the build-root environment to use for this config. 1138 env = main.Clone() 1139 env['BUILDDIR'] = variant_path 1140 1141 # variant_dir is the tail component of build path, and is used to 1142 # determine the build parameters (e.g., 'ALPHA_SE') 1143 (build_root, variant_dir) = splitpath(variant_path) 1144 1145 # Set env variables according to the build directory config. 1146 sticky_vars.files = [] 1147 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 1148 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 1149 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 1150 current_vars_file = joinpath(build_root, 'variables', variant_dir) 1151 if isfile(current_vars_file): 1152 sticky_vars.files.append(current_vars_file) 1153 if not GetOption('silent'): 1154 print "Using saved variables file %s" % current_vars_file 1155 elif variant_dir in ext_build_dirs: 1156 # Things in ext are built without a variant directory. 1157 continue 1158 else: 1159 # Build dir-specific variables file doesn't exist. 1160 1161 # Make sure the directory is there so we can create it later 1162 opt_dir = dirname(current_vars_file) 1163 if not isdir(opt_dir): 1164 mkdir(opt_dir) 1165 1166 # Get default build variables from source tree. Variables are 1167 # normally determined by name of $VARIANT_DIR, but can be 1168 # overridden by '--default=' arg on command line. 1169 default = GetOption('default') 1170 opts_dir = joinpath(main.root.abspath, 'build_opts') 1171 if default: 1172 default_vars_files = [joinpath(build_root, 'variables', default), 1173 joinpath(opts_dir, default)] 1174 else: 1175 default_vars_files = [joinpath(opts_dir, variant_dir)] 1176 existing_files = filter(isfile, default_vars_files) 1177 if existing_files: 1178 default_vars_file = existing_files[0] 1179 sticky_vars.files.append(default_vars_file) 1180 print "Variables file %s not found,\n using defaults in %s" \ 1181 % (current_vars_file, default_vars_file) 1182 else: 1183 print "Error: cannot find variables file %s or " \ 1184 "default file(s) %s" \ 1185 % (current_vars_file, ' or '.join(default_vars_files)) 1186 Exit(1) 1187 1188 # Apply current variable settings to env 1189 sticky_vars.Update(env) 1190 1191 help_texts["local_vars"] += \ 1192 "Build variables for %s:\n" % variant_dir \ 1193 + sticky_vars.GenerateHelpText(env) 1194 1195 # Process variable settings. 1196 1197 if not have_fenv and env['USE_FENV']: 1198 print "Warning: <fenv.h> not available; " \ 1199 "forcing USE_FENV to False in", variant_dir + "." 1200 env['USE_FENV'] = False 1201 1202 if not env['USE_FENV']: 1203 print "Warning: No IEEE FP rounding mode control in", variant_dir + "." 1204 print " FP results may deviate slightly from other platforms." 1205 1206 if not have_png and env['USE_PNG']: 1207 print "Warning: <png.h> not available; " \ 1208 "forcing USE_PNG to False in", variant_dir + "." 1209 env['USE_PNG'] = False 1210 1211 if env['USE_PNG']: 1212 env.Append(LIBS=['png']) 1213 1214 if env['EFENCE']: 1215 env.Append(LIBS=['efence']) 1216 1217 if env['USE_KVM']: 1218 if not have_kvm: 1219 print "Warning: Can not enable KVM, host seems to lack KVM support" 1220 env['USE_KVM'] = False 1221 elif not is_isa_kvm_compatible(env['TARGET_ISA']): 1222 print "Info: KVM support disabled due to unsupported host and " \ 1223 "target ISA combination" 1224 env['USE_KVM'] = False 1225 1226 if env['USE_TUNTAP']: 1227 if not have_tuntap: 1228 print "Warning: Can't connect EtherTap with a tap device." 1229 env['USE_TUNTAP'] = False 1230 1231 if env['BUILD_GPU']: 1232 env.Append(CPPDEFINES=['BUILD_GPU']) 1233 1234 # Warn about missing optional functionality 1235 if env['USE_KVM']: 1236 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']: 1237 print "Warning: perf_event headers lack support for the " \ 1238 "exclude_host attribute. KVM instruction counts will " \ 1239 "be inaccurate." 1240 1241 # Save sticky variable settings back to current variables file 1242 sticky_vars.Save(current_vars_file, env) 1243 1244 if env['USE_SSE2']: 1245 env.Append(CCFLAGS=['-msse2']) 1246 1247 # The src/SConscript file sets up the build rules in 'env' according 1248 # to the configured variables. It returns a list of environments, 1249 # one for each variant build (debug, opt, etc.) 1250 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env') 1251 1252# base help text 1253Help(''' 1254Usage: scons [scons options] [build variables] [target(s)] 1255 1256Extra scons options: 1257%(options)s 1258 1259Global build variables: 1260%(global_vars)s 1261 1262%(local_vars)s 1263''' % help_texts) 1264