SConstruct revision 12304
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) 362else: 363 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 364 print "Don't know what compiler options to use for your compiler." 365 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 366 print termcap.Yellow + ' version:' + termcap.Normal, 367 if not CXX_version: 368 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 369 termcap.Normal 370 else: 371 print CXX_version.replace('\n', '<nl>') 372 print " If you're trying to use a compiler other than GCC" 373 print " or clang, there appears to be something wrong with your" 374 print " environment." 375 print " " 376 print " If you are trying to use a compiler other than those listed" 377 print " above you will need to ease fix SConstruct and " 378 print " src/SConscript to support that compiler." 379 Exit(1) 380 381if main['GCC']: 382 # Check for a supported version of gcc. >= 4.8 is chosen for its 383 # level of c++11 support. See 384 # http://gcc.gnu.org/projects/cxx0x.html for details. 385 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 386 if compareVersions(gcc_version, "4.8") < 0: 387 print 'Error: gcc version 4.8 or newer required.' 388 print ' Installed version:', gcc_version 389 Exit(1) 390 391 main['GCC_VERSION'] = gcc_version 392 393 if compareVersions(gcc_version, '4.9') >= 0: 394 # Incremental linking with LTO is currently broken in gcc versions 395 # 4.9 and above. A version where everything works completely hasn't 396 # yet been identified. 397 # 398 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548 399 main['BROKEN_INCREMENTAL_LTO'] = True 400 if compareVersions(gcc_version, '6.0') >= 0: 401 # gcc versions 6.0 and greater accept an -flinker-output flag which 402 # selects what type of output the linker should generate. This is 403 # necessary for incremental lto to work, but is also broken in 404 # current versions of gcc. It may not be necessary in future 405 # versions. We add it here since it might be, and as a reminder that 406 # it exists. It's excluded if lto is being forced. 407 # 408 # https://gcc.gnu.org/gcc-6/changes.html 409 # https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03161.html 410 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866 411 if not GetOption('force_lto'): 412 main.Append(PSHLINKFLAGS='-flinker-output=rel') 413 main.Append(PLINKFLAGS='-flinker-output=rel') 414 415 # gcc from version 4.8 and above generates "rep; ret" instructions 416 # to avoid performance penalties on certain AMD chips. Older 417 # assemblers detect this as an error, "Error: expecting string 418 # instruction after `rep'" 419 as_version_raw = readCommand([main['AS'], '-v', '/dev/null', 420 '-o', '/dev/null'], 421 exception=False).split() 422 423 # version strings may contain extra distro-specific 424 # qualifiers, so play it safe and keep only what comes before 425 # the first hyphen 426 as_version = as_version_raw[-1].split('-')[0] if as_version_raw else None 427 428 if not as_version or compareVersions(as_version, "2.23") < 0: 429 print termcap.Yellow + termcap.Bold + \ 430 'Warning: This combination of gcc and binutils have' + \ 431 ' known incompatibilities.\n' + \ 432 ' If you encounter build problems, please update ' + \ 433 'binutils to 2.23.' + \ 434 termcap.Normal 435 436 # Make sure we warn if the user has requested to compile with the 437 # Undefined Benahvior Sanitizer and this version of gcc does not 438 # support it. 439 if GetOption('with_ubsan') and \ 440 compareVersions(gcc_version, '4.9') < 0: 441 print termcap.Yellow + termcap.Bold + \ 442 'Warning: UBSan is only supported using gcc 4.9 and later.' + \ 443 termcap.Normal 444 445 disable_lto = GetOption('no_lto') 446 if not disable_lto and main.get('BROKEN_INCREMENTAL_LTO', False) and \ 447 not GetOption('force_lto'): 448 print termcap.Yellow + termcap.Bold + \ 449 'Warning: Your compiler doesn\'t support incremental linking' + \ 450 ' and lto at the same time, so lto is being disabled. To force' + \ 451 ' lto on anyway, use the --force-lto option. That will disable' + \ 452 ' partial linking.' + \ 453 termcap.Normal 454 disable_lto = True 455 456 # Add the appropriate Link-Time Optimization (LTO) flags 457 # unless LTO is explicitly turned off. Note that these flags 458 # are only used by the fast target. 459 if not disable_lto: 460 # Pass the LTO flag when compiling to produce GIMPLE 461 # output, we merely create the flags here and only append 462 # them later 463 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 464 465 # Use the same amount of jobs for LTO as we are running 466 # scons with 467 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 468 469 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc', 470 '-fno-builtin-realloc', '-fno-builtin-free']) 471 472 # add option to check for undeclared overrides 473 if compareVersions(gcc_version, "5.0") > 0: 474 main.Append(CCFLAGS=['-Wno-error=suggest-override']) 475 476 # The address sanitizer is available for gcc >= 4.8 477 if GetOption('with_asan'): 478 if GetOption('with_ubsan') and \ 479 compareVersions(env['GCC_VERSION'], '4.9') >= 0: 480 env.Append(CCFLAGS=['-fsanitize=address,undefined', 481 '-fno-omit-frame-pointer'], 482 LINKFLAGS='-fsanitize=address,undefined') 483 else: 484 env.Append(CCFLAGS=['-fsanitize=address', 485 '-fno-omit-frame-pointer'], 486 LINKFLAGS='-fsanitize=address') 487 # Only gcc >= 4.9 supports UBSan, so check both the version 488 # and the command-line option before adding the compiler and 489 # linker flags. 490 elif GetOption('with_ubsan') and \ 491 compareVersions(env['GCC_VERSION'], '4.9') >= 0: 492 env.Append(CCFLAGS='-fsanitize=undefined') 493 env.Append(LINKFLAGS='-fsanitize=undefined') 494 495elif main['CLANG']: 496 # Check for a supported version of clang, >= 3.1 is needed to 497 # support similar features as gcc 4.8. See 498 # http://clang.llvm.org/cxx_status.html for details 499 clang_version_re = re.compile(".* version (\d+\.\d+)") 500 clang_version_match = clang_version_re.search(CXX_version) 501 if (clang_version_match): 502 clang_version = clang_version_match.groups()[0] 503 if compareVersions(clang_version, "3.1") < 0: 504 print 'Error: clang version 3.1 or newer required.' 505 print ' Installed version:', clang_version 506 Exit(1) 507 else: 508 print 'Error: Unable to determine clang version.' 509 Exit(1) 510 511 # clang has a few additional warnings that we disable, extraneous 512 # parantheses are allowed due to Ruby's printing of the AST, 513 # finally self assignments are allowed as the generated CPU code 514 # is relying on this 515 main.Append(CCFLAGS=['-Wno-parentheses', 516 '-Wno-self-assign', 517 # Some versions of libstdc++ (4.8?) seem to 518 # use struct hash and class hash 519 # interchangeably. 520 '-Wno-mismatched-tags', 521 ]) 522 523 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin']) 524 525 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as 526 # opposed to libstdc++, as the later is dated. 527 if sys.platform == "darwin": 528 main.Append(CXXFLAGS=['-stdlib=libc++']) 529 main.Append(LIBS=['c++']) 530 531 # On FreeBSD we need libthr. 532 if sys.platform.startswith('freebsd'): 533 main.Append(LIBS=['thr']) 534 535 # We require clang >= 3.1, so there is no need to check any 536 # versions here. 537 if GetOption('with_ubsan'): 538 if GetOption('with_asan'): 539 env.Append(CCFLAGS=['-fsanitize=address,undefined', 540 '-fno-omit-frame-pointer'], 541 LINKFLAGS='-fsanitize=address,undefined') 542 else: 543 env.Append(CCFLAGS='-fsanitize=undefined', 544 LINKFLAGS='-fsanitize=undefined') 545 546 elif GetOption('with_asan'): 547 env.Append(CCFLAGS=['-fsanitize=address', 548 '-fno-omit-frame-pointer'], 549 LINKFLAGS='-fsanitize=address') 550 551else: 552 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 553 print "Don't know what compiler options to use for your compiler." 554 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 555 print termcap.Yellow + ' version:' + termcap.Normal, 556 if not CXX_version: 557 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 558 termcap.Normal 559 else: 560 print CXX_version.replace('\n', '<nl>') 561 print " If you're trying to use a compiler other than GCC" 562 print " or clang, there appears to be something wrong with your" 563 print " environment." 564 print " " 565 print " If you are trying to use a compiler other than those listed" 566 print " above you will need to ease fix SConstruct and " 567 print " src/SConscript to support that compiler." 568 Exit(1) 569 570# Set up common yacc/bison flags (needed for Ruby) 571main['YACCFLAGS'] = '-d' 572main['YACCHXXFILESUFFIX'] = '.hh' 573 574# Do this after we save setting back, or else we'll tack on an 575# extra 'qdo' every time we run scons. 576if main['BATCH']: 577 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 578 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 579 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 580 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 581 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 582 583if sys.platform == 'cygwin': 584 # cygwin has some header file issues... 585 main.Append(CCFLAGS=["-Wno-uninitialized"]) 586 587# Check for the protobuf compiler 588protoc_version = readCommand([main['PROTOC'], '--version'], 589 exception='').split() 590 591# First two words should be "libprotoc x.y.z" 592if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc': 593 print termcap.Yellow + termcap.Bold + \ 594 'Warning: Protocol buffer compiler (protoc) not found.\n' + \ 595 ' Please install protobuf-compiler for tracing support.' + \ 596 termcap.Normal 597 main['PROTOC'] = False 598else: 599 # Based on the availability of the compress stream wrappers, 600 # require 2.1.0 601 min_protoc_version = '2.1.0' 602 if compareVersions(protoc_version[1], min_protoc_version) < 0: 603 print termcap.Yellow + termcap.Bold + \ 604 'Warning: protoc version', min_protoc_version, \ 605 'or newer required.\n' + \ 606 ' Installed version:', protoc_version[1], \ 607 termcap.Normal 608 main['PROTOC'] = False 609 else: 610 # Attempt to determine the appropriate include path and 611 # library path using pkg-config, that means we also need to 612 # check for pkg-config. Note that it is possible to use 613 # protobuf without the involvement of pkg-config. Later on we 614 # check go a library config check and at that point the test 615 # will fail if libprotobuf cannot be found. 616 if readCommand(['pkg-config', '--version'], exception=''): 617 try: 618 # Attempt to establish what linking flags to add for protobuf 619 # using pkg-config 620 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf') 621 except: 622 print termcap.Yellow + termcap.Bold + \ 623 'Warning: pkg-config could not get protobuf flags.' + \ 624 termcap.Normal 625 626 627# Check for 'timeout' from GNU coreutils. If present, regressions will 628# be run with a time limit. We require version 8.13 since we rely on 629# support for the '--foreground' option. 630if sys.platform.startswith('freebsd'): 631 timeout_lines = readCommand(['gtimeout', '--version'], 632 exception='').splitlines() 633else: 634 timeout_lines = readCommand(['timeout', '--version'], 635 exception='').splitlines() 636# Get the first line and tokenize it 637timeout_version = timeout_lines[0].split() if timeout_lines else [] 638main['TIMEOUT'] = timeout_version and \ 639 compareVersions(timeout_version[-1], '8.13') >= 0 640 641# Add a custom Check function to test for structure members. 642def CheckMember(context, include, decl, member, include_quotes="<>"): 643 context.Message("Checking for member %s in %s..." % 644 (member, decl)) 645 text = """ 646#include %(header)s 647int main(){ 648 %(decl)s test; 649 (void)test.%(member)s; 650 return 0; 651}; 652""" % { "header" : include_quotes[0] + include + include_quotes[1], 653 "decl" : decl, 654 "member" : member, 655 } 656 657 ret = context.TryCompile(text, extension=".cc") 658 context.Result(ret) 659 return ret 660 661# Platform-specific configuration. Note again that we assume that all 662# builds under a given build root run on the same host platform. 663conf = Configure(main, 664 conf_dir = joinpath(build_root, '.scons_config'), 665 log_file = joinpath(build_root, 'scons_config.log'), 666 custom_tests = { 667 'CheckMember' : CheckMember, 668 }) 669 670# Check if we should compile a 64 bit binary on Mac OS X/Darwin 671try: 672 import platform 673 uname = platform.uname() 674 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 675 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 676 main.Append(CCFLAGS=['-arch', 'x86_64']) 677 main.Append(CFLAGS=['-arch', 'x86_64']) 678 main.Append(LINKFLAGS=['-arch', 'x86_64']) 679 main.Append(ASFLAGS=['-arch', 'x86_64']) 680except: 681 pass 682 683# Recent versions of scons substitute a "Null" object for Configure() 684# when configuration isn't necessary, e.g., if the "--help" option is 685# present. Unfortuantely this Null object always returns false, 686# breaking all our configuration checks. We replace it with our own 687# more optimistic null object that returns True instead. 688if not conf: 689 def NullCheck(*args, **kwargs): 690 return True 691 692 class NullConf: 693 def __init__(self, env): 694 self.env = env 695 def Finish(self): 696 return self.env 697 def __getattr__(self, mname): 698 return NullCheck 699 700 conf = NullConf(main) 701 702# Cache build files in the supplied directory. 703if main['M5_BUILD_CACHE']: 704 print 'Using build cache located at', main['M5_BUILD_CACHE'] 705 CacheDir(main['M5_BUILD_CACHE']) 706 707main['USE_PYTHON'] = not GetOption('without_python') 708if main['USE_PYTHON']: 709 # Find Python include and library directories for embedding the 710 # interpreter. We rely on python-config to resolve the appropriate 711 # includes and linker flags. ParseConfig does not seem to understand 712 # the more exotic linker flags such as -Xlinker and -export-dynamic so 713 # we add them explicitly below. If you want to link in an alternate 714 # version of python, see above for instructions on how to invoke 715 # scons with the appropriate PATH set. 716 # 717 # First we check if python2-config exists, else we use python-config 718 python_config = readCommand(['which', 'python2-config'], 719 exception='').strip() 720 if not os.path.exists(python_config): 721 python_config = readCommand(['which', 'python-config'], 722 exception='').strip() 723 py_includes = readCommand([python_config, '--includes'], 724 exception='').split() 725 # Strip the -I from the include folders before adding them to the 726 # CPPPATH 727 main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes)) 728 729 # Read the linker flags and split them into libraries and other link 730 # flags. The libraries are added later through the call the CheckLib. 731 py_ld_flags = readCommand([python_config, '--ldflags'], 732 exception='').split() 733 py_libs = [] 734 for lib in py_ld_flags: 735 if not lib.startswith('-l'): 736 main.Append(LINKFLAGS=[lib]) 737 else: 738 lib = lib[2:] 739 if lib not in py_libs: 740 py_libs.append(lib) 741 742 # verify that this stuff works 743 if not conf.CheckHeader('Python.h', '<>'): 744 print "Error: can't find Python.h header in", py_includes 745 print "Install Python headers (package python-dev on Ubuntu and RedHat)" 746 Exit(1) 747 748 for lib in py_libs: 749 if not conf.CheckLib(lib): 750 print "Error: can't find library %s required by python" % lib 751 Exit(1) 752 753# On Solaris you need to use libsocket for socket ops 754if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 755 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 756 print "Can't find library with socket calls (e.g. accept())" 757 Exit(1) 758 759# Check for zlib. If the check passes, libz will be automatically 760# added to the LIBS environment variable. 761if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 762 print 'Error: did not find needed zlib compression library '\ 763 'and/or zlib.h header file.' 764 print ' Please install zlib and try again.' 765 Exit(1) 766 767# If we have the protobuf compiler, also make sure we have the 768# development libraries. If the check passes, libprotobuf will be 769# automatically added to the LIBS environment variable. After 770# this, we can use the HAVE_PROTOBUF flag to determine if we have 771# got both protoc and libprotobuf available. 772main['HAVE_PROTOBUF'] = main['PROTOC'] and \ 773 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h', 774 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;') 775 776# If we have the compiler but not the library, print another warning. 777if main['PROTOC'] and not main['HAVE_PROTOBUF']: 778 print termcap.Yellow + termcap.Bold + \ 779 'Warning: did not find protocol buffer library and/or headers.\n' + \ 780 ' Please install libprotobuf-dev for tracing support.' + \ 781 termcap.Normal 782 783# Check for librt. 784have_posix_clock = \ 785 conf.CheckLibWithHeader(None, 'time.h', 'C', 786 'clock_nanosleep(0,0,NULL,NULL);') or \ 787 conf.CheckLibWithHeader('rt', 'time.h', 'C', 788 'clock_nanosleep(0,0,NULL,NULL);') 789 790have_posix_timers = \ 791 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C', 792 'timer_create(CLOCK_MONOTONIC, NULL, NULL);') 793 794if not GetOption('without_tcmalloc'): 795 if conf.CheckLib('tcmalloc'): 796 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 797 elif conf.CheckLib('tcmalloc_minimal'): 798 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 799 else: 800 print termcap.Yellow + termcap.Bold + \ 801 "You can get a 12% performance improvement by "\ 802 "installing tcmalloc (libgoogle-perftools-dev package "\ 803 "on Ubuntu or RedHat)." + termcap.Normal 804 805 806# Detect back trace implementations. The last implementation in the 807# list will be used by default. 808backtrace_impls = [ "none" ] 809 810if conf.CheckLibWithHeader(None, 'execinfo.h', 'C', 811 'backtrace_symbols_fd((void*)0, 0, 0);'): 812 backtrace_impls.append("glibc") 813elif conf.CheckLibWithHeader('execinfo', 'execinfo.h', 'C', 814 'backtrace_symbols_fd((void*)0, 0, 0);'): 815 # NetBSD and FreeBSD need libexecinfo. 816 backtrace_impls.append("glibc") 817 main.Append(LIBS=['execinfo']) 818 819if backtrace_impls[-1] == "none": 820 default_backtrace_impl = "none" 821 print termcap.Yellow + termcap.Bold + \ 822 "No suitable back trace implementation found." + \ 823 termcap.Normal 824 825if not have_posix_clock: 826 print "Can't find library for POSIX clocks." 827 828# Check for <fenv.h> (C99 FP environment control) 829have_fenv = conf.CheckHeader('fenv.h', '<>') 830if not have_fenv: 831 print "Warning: Header file <fenv.h> not found." 832 print " This host has no IEEE FP rounding mode control." 833 834# Check for <png.h> (libpng library needed if wanting to dump 835# frame buffer image in png format) 836have_png = conf.CheckHeader('png.h', '<>') 837if not have_png: 838 print "Warning: Header file <png.h> not found." 839 print " This host has no libpng library." 840 print " Disabling support for PNG framebuffers." 841 842# Check if we should enable KVM-based hardware virtualization. The API 843# we rely on exists since version 2.6.36 of the kernel, but somehow 844# the KVM_API_VERSION does not reflect the change. We test for one of 845# the types as a fall back. 846have_kvm = conf.CheckHeader('linux/kvm.h', '<>') 847if not have_kvm: 848 print "Info: Compatible header file <linux/kvm.h> not found, " \ 849 "disabling KVM support." 850 851# Check if the TUN/TAP driver is available. 852have_tuntap = conf.CheckHeader('linux/if_tun.h', '<>') 853if not have_tuntap: 854 print "Info: Compatible header file <linux/if_tun.h> not found." 855 856# x86 needs support for xsave. We test for the structure here since we 857# won't be able to run new tests by the time we know which ISA we're 858# targeting. 859have_kvm_xsave = conf.CheckTypeSize('struct kvm_xsave', 860 '#include <linux/kvm.h>') != 0 861 862# Check if the requested target ISA is compatible with the host 863def is_isa_kvm_compatible(isa): 864 try: 865 import platform 866 host_isa = platform.machine() 867 except: 868 print "Warning: Failed to determine host ISA." 869 return False 870 871 if not have_posix_timers: 872 print "Warning: Can not enable KVM, host seems to lack support " \ 873 "for POSIX timers" 874 return False 875 876 if isa == "arm": 877 return host_isa in ( "armv7l", "aarch64" ) 878 elif isa == "x86": 879 if host_isa != "x86_64": 880 return False 881 882 if not have_kvm_xsave: 883 print "KVM on x86 requires xsave support in kernel headers." 884 return False 885 886 return True 887 else: 888 return False 889 890 891# Check if the exclude_host attribute is available. We want this to 892# get accurate instruction counts in KVM. 893main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember( 894 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host') 895 896 897###################################################################### 898# 899# Finish the configuration 900# 901main = conf.Finish() 902 903###################################################################### 904# 905# Collect all non-global variables 906# 907 908# Define the universe of supported ISAs 909all_isa_list = [ ] 910all_gpu_isa_list = [ ] 911Export('all_isa_list') 912Export('all_gpu_isa_list') 913 914class CpuModel(object): 915 '''The CpuModel class encapsulates everything the ISA parser needs to 916 know about a particular CPU model.''' 917 918 # Dict of available CPU model objects. Accessible as CpuModel.dict. 919 dict = {} 920 921 # Constructor. Automatically adds models to CpuModel.dict. 922 def __init__(self, name, default=False): 923 self.name = name # name of model 924 925 # This cpu is enabled by default 926 self.default = default 927 928 # Add self to dict 929 if name in CpuModel.dict: 930 raise AttributeError, "CpuModel '%s' already registered" % name 931 CpuModel.dict[name] = self 932 933Export('CpuModel') 934 935# Sticky variables get saved in the variables file so they persist from 936# one invocation to the next (unless overridden, in which case the new 937# value becomes sticky). 938sticky_vars = Variables(args=ARGUMENTS) 939Export('sticky_vars') 940 941# Sticky variables that should be exported 942export_vars = [] 943Export('export_vars') 944 945# For Ruby 946all_protocols = [] 947Export('all_protocols') 948protocol_dirs = [] 949Export('protocol_dirs') 950slicc_includes = [] 951Export('slicc_includes') 952 953# Walk the tree and execute all SConsopts scripts that wil add to the 954# above variables 955if GetOption('verbose'): 956 print "Reading SConsopts" 957for bdir in [ base_dir ] + extras_dir_list: 958 if not isdir(bdir): 959 print "Error: directory '%s' does not exist" % bdir 960 Exit(1) 961 for root, dirs, files in os.walk(bdir): 962 if 'SConsopts' in files: 963 if GetOption('verbose'): 964 print "Reading", joinpath(root, 'SConsopts') 965 SConscript(joinpath(root, 'SConsopts')) 966 967all_isa_list.sort() 968all_gpu_isa_list.sort() 969 970sticky_vars.AddVariables( 971 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 972 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'hsail', all_gpu_isa_list), 973 ListVariable('CPU_MODELS', 'CPU models', 974 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 975 sorted(CpuModel.dict.keys())), 976 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 977 False), 978 BoolVariable('SS_COMPATIBLE_FP', 979 'Make floating-point results compatible with SimpleScalar', 980 False), 981 BoolVariable('USE_SSE2', 982 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 983 False), 984 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 985 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 986 BoolVariable('USE_PNG', 'Enable support for PNG images', have_png), 987 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', 988 False), 989 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', 990 have_kvm), 991 BoolVariable('USE_TUNTAP', 992 'Enable using a tap device to bridge to the host network', 993 have_tuntap), 994 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False), 995 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None', 996 all_protocols), 997 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation', 998 backtrace_impls[-1], backtrace_impls) 999 ) 1000 1001# These variables get exported to #defines in config/*.hh (see src/SConscript). 1002export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'TARGET_GPU_ISA', 1003 'CP_ANNOTATE', 'USE_POSIX_CLOCK', 'USE_KVM', 'USE_TUNTAP', 1004 'PROTOCOL', 'HAVE_PROTOBUF', 'HAVE_PERF_ATTR_EXCLUDE_HOST', 1005 'USE_PNG'] 1006 1007################################################### 1008# 1009# Define a SCons builder for configuration flag headers. 1010# 1011################################################### 1012 1013# This function generates a config header file that #defines the 1014# variable symbol to the current variable setting (0 or 1). The source 1015# operands are the name of the variable and a Value node containing the 1016# value of the variable. 1017def build_config_file(target, source, env): 1018 (variable, value) = [s.get_contents() for s in source] 1019 f = file(str(target[0]), 'w') 1020 print >> f, '#define', variable, value 1021 f.close() 1022 return None 1023 1024# Combine the two functions into a scons Action object. 1025config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 1026 1027# The emitter munges the source & target node lists to reflect what 1028# we're really doing. 1029def config_emitter(target, source, env): 1030 # extract variable name from Builder arg 1031 variable = str(target[0]) 1032 # True target is config header file 1033 target = joinpath('config', variable.lower() + '.hh') 1034 val = env[variable] 1035 if isinstance(val, bool): 1036 # Force value to 0/1 1037 val = int(val) 1038 elif isinstance(val, str): 1039 val = '"' + val + '"' 1040 1041 # Sources are variable name & value (packaged in SCons Value nodes) 1042 return ([target], [Value(variable), Value(val)]) 1043 1044config_builder = Builder(emitter = config_emitter, action = config_action) 1045 1046main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 1047 1048################################################### 1049# 1050# Builders for static and shared partially linked object files. 1051# 1052################################################### 1053 1054partial_static_builder = Builder(action=SCons.Defaults.LinkAction, 1055 src_suffix='$OBJSUFFIX', 1056 src_builder=['StaticObject', 'Object'], 1057 LINKFLAGS='$PLINKFLAGS', 1058 LIBS='') 1059 1060def partial_shared_emitter(target, source, env): 1061 for tgt in target: 1062 tgt.attributes.shared = 1 1063 return (target, source) 1064partial_shared_builder = Builder(action=SCons.Defaults.ShLinkAction, 1065 emitter=partial_shared_emitter, 1066 src_suffix='$SHOBJSUFFIX', 1067 src_builder='SharedObject', 1068 SHLINKFLAGS='$PSHLINKFLAGS', 1069 LIBS='') 1070 1071main.Append(BUILDERS = { 'PartialShared' : partial_shared_builder, 1072 'PartialStatic' : partial_static_builder }) 1073 1074# builds in ext are shared across all configs in the build root. 1075ext_dir = abspath(joinpath(str(main.root), 'ext')) 1076ext_build_dirs = [] 1077for root, dirs, files in os.walk(ext_dir): 1078 if 'SConscript' in files: 1079 build_dir = os.path.relpath(root, ext_dir) 1080 ext_build_dirs.append(build_dir) 1081 main.SConscript(joinpath(root, 'SConscript'), 1082 variant_dir=joinpath(build_root, build_dir)) 1083 1084main.Prepend(CPPPATH=Dir('ext/pybind11/include/')) 1085 1086################################################### 1087# 1088# This builder and wrapper method are used to set up a directory with 1089# switching headers. Those are headers which are in a generic location and 1090# that include more specific headers from a directory chosen at build time 1091# based on the current build settings. 1092# 1093################################################### 1094 1095def build_switching_header(target, source, env): 1096 path = str(target[0]) 1097 subdir = str(source[0]) 1098 dp, fp = os.path.split(path) 1099 dp = os.path.relpath(os.path.realpath(dp), 1100 os.path.realpath(env['BUILDDIR'])) 1101 with open(path, 'w') as hdr: 1102 print >>hdr, '#include "%s/%s/%s"' % (dp, subdir, fp) 1103 1104switching_header_action = MakeAction(build_switching_header, 1105 Transform('GENERATE')) 1106 1107switching_header_builder = Builder(action=switching_header_action, 1108 source_factory=Value, 1109 single_source=True) 1110 1111main.Append(BUILDERS = { 'SwitchingHeader': switching_header_builder }) 1112 1113def switching_headers(self, headers, source): 1114 for header in headers: 1115 self.SwitchingHeader(header, source) 1116 1117main.AddMethod(switching_headers, 'SwitchingHeaders') 1118 1119################################################### 1120# 1121# Define build environments for selected configurations. 1122# 1123################################################### 1124 1125for variant_path in variant_paths: 1126 if not GetOption('silent'): 1127 print "Building in", variant_path 1128 1129 # Make a copy of the build-root environment to use for this config. 1130 env = main.Clone() 1131 env['BUILDDIR'] = variant_path 1132 1133 # variant_dir is the tail component of build path, and is used to 1134 # determine the build parameters (e.g., 'ALPHA_SE') 1135 (build_root, variant_dir) = splitpath(variant_path) 1136 1137 # Set env variables according to the build directory config. 1138 sticky_vars.files = [] 1139 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 1140 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 1141 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 1142 current_vars_file = joinpath(build_root, 'variables', variant_dir) 1143 if isfile(current_vars_file): 1144 sticky_vars.files.append(current_vars_file) 1145 if not GetOption('silent'): 1146 print "Using saved variables file %s" % current_vars_file 1147 elif variant_dir in ext_build_dirs: 1148 # Things in ext are built without a variant directory. 1149 continue 1150 else: 1151 # Build dir-specific variables file doesn't exist. 1152 1153 # Make sure the directory is there so we can create it later 1154 opt_dir = dirname(current_vars_file) 1155 if not isdir(opt_dir): 1156 mkdir(opt_dir) 1157 1158 # Get default build variables from source tree. Variables are 1159 # normally determined by name of $VARIANT_DIR, but can be 1160 # overridden by '--default=' arg on command line. 1161 default = GetOption('default') 1162 opts_dir = joinpath(main.root.abspath, 'build_opts') 1163 if default: 1164 default_vars_files = [joinpath(build_root, 'variables', default), 1165 joinpath(opts_dir, default)] 1166 else: 1167 default_vars_files = [joinpath(opts_dir, variant_dir)] 1168 existing_files = filter(isfile, default_vars_files) 1169 if existing_files: 1170 default_vars_file = existing_files[0] 1171 sticky_vars.files.append(default_vars_file) 1172 print "Variables file %s not found,\n using defaults in %s" \ 1173 % (current_vars_file, default_vars_file) 1174 else: 1175 print "Error: cannot find variables file %s or " \ 1176 "default file(s) %s" \ 1177 % (current_vars_file, ' or '.join(default_vars_files)) 1178 Exit(1) 1179 1180 # Apply current variable settings to env 1181 sticky_vars.Update(env) 1182 1183 help_texts["local_vars"] += \ 1184 "Build variables for %s:\n" % variant_dir \ 1185 + sticky_vars.GenerateHelpText(env) 1186 1187 # Process variable settings. 1188 1189 if not have_fenv and env['USE_FENV']: 1190 print "Warning: <fenv.h> not available; " \ 1191 "forcing USE_FENV to False in", variant_dir + "." 1192 env['USE_FENV'] = False 1193 1194 if not env['USE_FENV']: 1195 print "Warning: No IEEE FP rounding mode control in", variant_dir + "." 1196 print " FP results may deviate slightly from other platforms." 1197 1198 if not have_png and env['USE_PNG']: 1199 print "Warning: <png.h> not available; " \ 1200 "forcing USE_PNG to False in", variant_dir + "." 1201 env['USE_PNG'] = False 1202 1203 if env['USE_PNG']: 1204 env.Append(LIBS=['png']) 1205 1206 if env['EFENCE']: 1207 env.Append(LIBS=['efence']) 1208 1209 if env['USE_KVM']: 1210 if not have_kvm: 1211 print "Warning: Can not enable KVM, host seems to lack KVM support" 1212 env['USE_KVM'] = False 1213 elif not is_isa_kvm_compatible(env['TARGET_ISA']): 1214 print "Info: KVM support disabled due to unsupported host and " \ 1215 "target ISA combination" 1216 env['USE_KVM'] = False 1217 1218 if env['USE_TUNTAP']: 1219 if not have_tuntap: 1220 print "Warning: Can't connect EtherTap with a tap device." 1221 env['USE_TUNTAP'] = False 1222 1223 if env['BUILD_GPU']: 1224 env.Append(CPPDEFINES=['BUILD_GPU']) 1225 1226 # Warn about missing optional functionality 1227 if env['USE_KVM']: 1228 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']: 1229 print "Warning: perf_event headers lack support for the " \ 1230 "exclude_host attribute. KVM instruction counts will " \ 1231 "be inaccurate." 1232 1233 # Save sticky variable settings back to current variables file 1234 sticky_vars.Save(current_vars_file, env) 1235 1236 if env['USE_SSE2']: 1237 env.Append(CCFLAGS=['-msse2']) 1238 1239 # The src/SConscript file sets up the build rules in 'env' according 1240 # to the configured variables. It returns a list of environments, 1241 # one for each variant build (debug, opt, etc.) 1242 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env') 1243 1244# base help text 1245Help(''' 1246Usage: scons [scons options] [build variables] [target(s)] 1247 1248Extra scons options: 1249%(options)s 1250 1251Global build variables: 1252%(global_vars)s 1253 1254%(local_vars)s 1255''' % help_texts) 1256