SConstruct revision 13421:79af503161d7
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 81from __future__ import print_function 82 83# Global Python includes 84import itertools 85import os 86import re 87import shutil 88import subprocess 89import sys 90 91from os import mkdir, environ 92from os.path import abspath, basename, dirname, expanduser, normpath 93from os.path import exists, isdir, isfile 94from os.path import join as joinpath, split as splitpath 95 96# SCons includes 97import SCons 98import SCons.Node 99 100from m5.util import compareVersions, readCommand 101 102help_texts = { 103 "options" : "", 104 "global_vars" : "", 105 "local_vars" : "" 106} 107 108Export("help_texts") 109 110 111# There's a bug in scons in that (1) by default, the help texts from 112# AddOption() are supposed to be displayed when you type 'scons -h' 113# and (2) you can override the help displayed by 'scons -h' using the 114# Help() function, but these two features are incompatible: once 115# you've overridden the help text using Help(), there's no way to get 116# at the help texts from AddOptions. See: 117# http://scons.tigris.org/issues/show_bug.cgi?id=2356 118# http://scons.tigris.org/issues/show_bug.cgi?id=2611 119# This hack lets us extract the help text from AddOptions and 120# re-inject it via Help(). Ideally someday this bug will be fixed and 121# we can just use AddOption directly. 122def AddLocalOption(*args, **kwargs): 123 col_width = 30 124 125 help = " " + ", ".join(args) 126 if "help" in kwargs: 127 length = len(help) 128 if length >= col_width: 129 help += "\n" + " " * col_width 130 else: 131 help += " " * (col_width - length) 132 help += kwargs["help"] 133 help_texts["options"] += help + "\n" 134 135 AddOption(*args, **kwargs) 136 137AddLocalOption('--colors', dest='use_colors', action='store_true', 138 help="Add color to abbreviated scons output") 139AddLocalOption('--no-colors', dest='use_colors', action='store_false', 140 help="Don't add color to abbreviated scons output") 141AddLocalOption('--with-cxx-config', dest='with_cxx_config', 142 action='store_true', 143 help="Build with support for C++-based configuration") 144AddLocalOption('--default', dest='default', type='string', action='store', 145 help='Override which build_opts file to use for defaults') 146AddLocalOption('--ignore-style', dest='ignore_style', action='store_true', 147 help='Disable style checking hooks') 148AddLocalOption('--gold-linker', dest='gold_linker', action='store_true', 149 help='Use the gold linker') 150AddLocalOption('--no-lto', dest='no_lto', action='store_true', 151 help='Disable Link-Time Optimization for fast') 152AddLocalOption('--force-lto', dest='force_lto', action='store_true', 153 help='Use Link-Time Optimization instead of partial linking' + 154 ' when the compiler doesn\'t support using them together.') 155AddLocalOption('--update-ref', dest='update_ref', action='store_true', 156 help='Update test reference outputs') 157AddLocalOption('--verbose', dest='verbose', action='store_true', 158 help='Print full tool command lines') 159AddLocalOption('--without-python', dest='without_python', 160 action='store_true', 161 help='Build without Python configuration support') 162AddLocalOption('--without-tcmalloc', dest='without_tcmalloc', 163 action='store_true', 164 help='Disable linking against tcmalloc') 165AddLocalOption('--with-ubsan', dest='with_ubsan', action='store_true', 166 help='Build with Undefined Behavior Sanitizer if available') 167AddLocalOption('--with-asan', dest='with_asan', action='store_true', 168 help='Build with Address Sanitizer if available') 169 170if GetOption('no_lto') and GetOption('force_lto'): 171 print('--no-lto and --force-lto are mutually exclusive') 172 Exit(1) 173 174######################################################################## 175# 176# Set up the main build environment. 177# 178######################################################################## 179 180main = Environment() 181 182from gem5_scons import Transform 183from gem5_scons.util import get_termcap 184termcap = get_termcap() 185 186main_dict_keys = main.Dictionary().keys() 187 188# Check that we have a C/C++ compiler 189if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys): 190 print("No C++ compiler installed (package g++ on Ubuntu and RedHat)") 191 Exit(1) 192 193################################################### 194# 195# Figure out which configurations to set up based on the path(s) of 196# the target(s). 197# 198################################################### 199 200# Find default configuration & binary. 201Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug')) 202 203# helper function: find last occurrence of element in list 204def rfind(l, elt, offs = -1): 205 for i in range(len(l)+offs, 0, -1): 206 if l[i] == elt: 207 return i 208 raise ValueError, "element not found" 209 210# Take a list of paths (or SCons Nodes) and return a list with all 211# paths made absolute and ~-expanded. Paths will be interpreted 212# relative to the launch directory unless a different root is provided 213def makePathListAbsolute(path_list, root=GetLaunchDir()): 214 return [abspath(joinpath(root, expanduser(str(p)))) 215 for p in path_list] 216 217# Each target must have 'build' in the interior of the path; the 218# directory below this will determine the build parameters. For 219# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we 220# recognize that ALPHA_SE specifies the configuration because it 221# follow 'build' in the build path. 222 223# The funky assignment to "[:]" is needed to replace the list contents 224# in place rather than reassign the symbol to a new list, which 225# doesn't work (obviously!). 226BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS) 227 228# Generate a list of the unique build roots and configs that the 229# collected targets reference. 230variant_paths = [] 231build_root = None 232for t in BUILD_TARGETS: 233 path_dirs = t.split('/') 234 try: 235 build_top = rfind(path_dirs, 'build', -2) 236 except: 237 print("Error: no non-leaf 'build' dir found on target path", t) 238 Exit(1) 239 this_build_root = joinpath('/',*path_dirs[:build_top+1]) 240 if not build_root: 241 build_root = this_build_root 242 else: 243 if this_build_root != build_root: 244 print("Error: build targets not under same build root\n" 245 " %s\n %s" % (build_root, this_build_root)) 246 Exit(1) 247 variant_path = joinpath('/',*path_dirs[:build_top+2]) 248 if variant_path not in variant_paths: 249 variant_paths.append(variant_path) 250 251# Make sure build_root exists (might not if this is the first build there) 252if not isdir(build_root): 253 mkdir(build_root) 254main['BUILDROOT'] = build_root 255 256Export('main') 257 258main.SConsignFile(joinpath(build_root, "sconsign")) 259 260# Default duplicate option is to use hard links, but this messes up 261# when you use emacs to edit a file in the target dir, as emacs moves 262# file to file~ then copies to file, breaking the link. Symbolic 263# (soft) links work better. 264main.SetOption('duplicate', 'soft-copy') 265 266# 267# Set up global sticky variables... these are common to an entire build 268# tree (not specific to a particular build like ALPHA_SE) 269# 270 271global_vars_file = joinpath(build_root, 'variables.global') 272 273global_vars = Variables(global_vars_file, args=ARGUMENTS) 274 275global_vars.AddVariables( 276 ('CC', 'C compiler', environ.get('CC', main['CC'])), 277 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])), 278 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')), 279 ('BATCH', 'Use batch pool for build and tests', False), 280 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'), 281 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False), 282 ('EXTRAS', 'Add extra directories to the compilation', '') 283 ) 284 285# Update main environment with values from ARGUMENTS & global_vars_file 286global_vars.Update(main) 287help_texts["global_vars"] += global_vars.GenerateHelpText(main) 288 289# Save sticky variable settings back to current variables file 290global_vars.Save(global_vars_file, main) 291 292# Parse EXTRAS variable to build list of all directories where we're 293# look for sources etc. This list is exported as extras_dir_list. 294base_dir = main.srcdir.abspath 295if main['EXTRAS']: 296 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':')) 297else: 298 extras_dir_list = [] 299 300Export('base_dir') 301Export('extras_dir_list') 302 303# the ext directory should be on the #includes path 304main.Append(CPPPATH=[Dir('ext')]) 305 306# Add shared top-level headers 307main.Prepend(CPPPATH=Dir('include')) 308 309if GetOption('verbose'): 310 def MakeAction(action, string, *args, **kwargs): 311 return Action(action, *args, **kwargs) 312else: 313 MakeAction = Action 314 main['CCCOMSTR'] = Transform("CC") 315 main['CXXCOMSTR'] = Transform("CXX") 316 main['ASCOMSTR'] = Transform("AS") 317 main['ARCOMSTR'] = Transform("AR", 0) 318 main['LINKCOMSTR'] = Transform("LINK", 0) 319 main['SHLINKCOMSTR'] = Transform("SHLINK", 0) 320 main['RANLIBCOMSTR'] = Transform("RANLIB", 0) 321 main['M4COMSTR'] = Transform("M4") 322 main['SHCCCOMSTR'] = Transform("SHCC") 323 main['SHCXXCOMSTR'] = Transform("SHCXX") 324Export('MakeAction') 325 326# Initialize the Link-Time Optimization (LTO) flags 327main['LTO_CCFLAGS'] = [] 328main['LTO_LDFLAGS'] = [] 329 330# According to the readme, tcmalloc works best if the compiler doesn't 331# assume that we're using the builtin malloc and friends. These flags 332# are compiler-specific, so we need to set them after we detect which 333# compiler we're using. 334main['TCMALLOC_CCFLAGS'] = [] 335 336CXX_version = readCommand([main['CXX'],'--version'], exception=False) 337CXX_V = readCommand([main['CXX'],'-V'], exception=False) 338 339main['GCC'] = CXX_version and CXX_version.find('g++') >= 0 340main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0 341if main['GCC'] + main['CLANG'] > 1: 342 print('Error: How can we have two at the same time?') 343 Exit(1) 344 345# Set up default C++ compiler flags 346if main['GCC'] or main['CLANG']: 347 # As gcc and clang share many flags, do the common parts here 348 main.Append(CCFLAGS=['-pipe']) 349 main.Append(CCFLAGS=['-fno-strict-aliasing']) 350 # Enable -Wall and -Wextra and then disable the few warnings that 351 # we consistently violate 352 main.Append(CCFLAGS=['-Wall', '-Wundef', '-Wextra', 353 '-Wno-sign-compare', '-Wno-unused-parameter']) 354 # We always compile using C++11 355 main.Append(CXXFLAGS=['-std=c++11']) 356 if sys.platform.startswith('freebsd'): 357 main.Append(CCFLAGS=['-I/usr/local/include']) 358 main.Append(CXXFLAGS=['-I/usr/local/include']) 359 360 main['FILTER_PSHLINKFLAGS'] = lambda x: str(x).replace(' -shared', '') 361 main['PSHLINKFLAGS'] = main.subst('${FILTER_PSHLINKFLAGS(SHLINKFLAGS)}') 362 if GetOption('gold_linker'): 363 main.Append(LINKFLAGS='-fuse-ld=gold') 364 main['PLINKFLAGS'] = main.subst('${LINKFLAGS}') 365 shared_partial_flags = ['-r', '-nostdlib'] 366 main.Append(PSHLINKFLAGS=shared_partial_flags) 367 main.Append(PLINKFLAGS=shared_partial_flags) 368 369 # Treat warnings as errors but white list some warnings that we 370 # want to allow (e.g., deprecation warnings). 371 main.Append(CCFLAGS=['-Werror', 372 '-Wno-error=deprecated-declarations', 373 '-Wno-error=deprecated', 374 ]) 375else: 376 print(termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, end=' ') 377 print("Don't know what compiler options to use for your compiler.") 378 print(termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']) 379 print(termcap.Yellow + ' version:' + termcap.Normal, end = ' ') 380 if not CXX_version: 381 print(termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" + 382 termcap.Normal) 383 else: 384 print(CXX_version.replace('\n', '<nl>')) 385 print(" If you're trying to use a compiler other than GCC") 386 print(" or clang, there appears to be something wrong with your") 387 print(" environment.") 388 print(" ") 389 print(" If you are trying to use a compiler other than those listed") 390 print(" above you will need to ease fix SConstruct and ") 391 print(" src/SConscript to support that compiler.") 392 Exit(1) 393 394if main['GCC']: 395 # Check for a supported version of gcc. >= 4.8 is chosen for its 396 # level of c++11 support. See 397 # http://gcc.gnu.org/projects/cxx0x.html for details. 398 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 399 if compareVersions(gcc_version, "4.8") < 0: 400 print('Error: gcc version 4.8 or newer required.') 401 print(' Installed version: ', gcc_version) 402 Exit(1) 403 404 main['GCC_VERSION'] = gcc_version 405 406 if compareVersions(gcc_version, '4.9') >= 0: 407 # Incremental linking with LTO is currently broken in gcc versions 408 # 4.9 and above. A version where everything works completely hasn't 409 # yet been identified. 410 # 411 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548 412 main['BROKEN_INCREMENTAL_LTO'] = True 413 if compareVersions(gcc_version, '6.0') >= 0: 414 # gcc versions 6.0 and greater accept an -flinker-output flag which 415 # selects what type of output the linker should generate. This is 416 # necessary for incremental lto to work, but is also broken in 417 # current versions of gcc. It may not be necessary in future 418 # versions. We add it here since it might be, and as a reminder that 419 # it exists. It's excluded if lto is being forced. 420 # 421 # https://gcc.gnu.org/gcc-6/changes.html 422 # https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03161.html 423 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866 424 if not GetOption('force_lto'): 425 main.Append(PSHLINKFLAGS='-flinker-output=rel') 426 main.Append(PLINKFLAGS='-flinker-output=rel') 427 428 # Make sure we warn if the user has requested to compile with the 429 # Undefined Benahvior Sanitizer and this version of gcc does not 430 # support it. 431 if GetOption('with_ubsan') and \ 432 compareVersions(gcc_version, '4.9') < 0: 433 print(termcap.Yellow + termcap.Bold + 434 'Warning: UBSan is only supported using gcc 4.9 and later.' + 435 termcap.Normal) 436 437 disable_lto = GetOption('no_lto') 438 if not disable_lto and main.get('BROKEN_INCREMENTAL_LTO', False) and \ 439 not GetOption('force_lto'): 440 print(termcap.Yellow + termcap.Bold + 441 'Warning: Your compiler doesn\'t support incremental linking' + 442 ' and lto at the same time, so lto is being disabled. To force' + 443 ' lto on anyway, use the --force-lto option. That will disable' + 444 ' partial linking.' + 445 termcap.Normal) 446 disable_lto = True 447 448 # Add the appropriate Link-Time Optimization (LTO) flags 449 # unless LTO is explicitly turned off. Note that these flags 450 # are only used by the fast target. 451 if not disable_lto: 452 # Pass the LTO flag when compiling to produce GIMPLE 453 # output, we merely create the flags here and only append 454 # them later 455 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 456 457 # Use the same amount of jobs for LTO as we are running 458 # scons with 459 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 460 461 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc', 462 '-fno-builtin-realloc', '-fno-builtin-free']) 463 464 # The address sanitizer is available for gcc >= 4.8 465 if GetOption('with_asan'): 466 if GetOption('with_ubsan') and \ 467 compareVersions(main['GCC_VERSION'], '4.9') >= 0: 468 main.Append(CCFLAGS=['-fsanitize=address,undefined', 469 '-fno-omit-frame-pointer'], 470 LINKFLAGS='-fsanitize=address,undefined') 471 else: 472 main.Append(CCFLAGS=['-fsanitize=address', 473 '-fno-omit-frame-pointer'], 474 LINKFLAGS='-fsanitize=address') 475 # Only gcc >= 4.9 supports UBSan, so check both the version 476 # and the command-line option before adding the compiler and 477 # linker flags. 478 elif GetOption('with_ubsan') and \ 479 compareVersions(main['GCC_VERSION'], '4.9') >= 0: 480 main.Append(CCFLAGS='-fsanitize=undefined') 481 main.Append(LINKFLAGS='-fsanitize=undefined') 482 483elif main['CLANG']: 484 # Check for a supported version of clang, >= 3.1 is needed to 485 # support similar features as gcc 4.8. See 486 # http://clang.llvm.org/cxx_status.html for details 487 clang_version_re = re.compile(".* version (\d+\.\d+)") 488 clang_version_match = clang_version_re.search(CXX_version) 489 if (clang_version_match): 490 clang_version = clang_version_match.groups()[0] 491 if compareVersions(clang_version, "3.1") < 0: 492 print('Error: clang version 3.1 or newer required.') 493 print(' Installed version:', clang_version) 494 Exit(1) 495 else: 496 print('Error: Unable to determine clang version.') 497 Exit(1) 498 499 # clang has a few additional warnings that we disable, extraneous 500 # parantheses are allowed due to Ruby's printing of the AST, 501 # finally self assignments are allowed as the generated CPU code 502 # is relying on this 503 main.Append(CCFLAGS=['-Wno-parentheses', 504 '-Wno-self-assign', 505 # Some versions of libstdc++ (4.8?) seem to 506 # use struct hash and class hash 507 # interchangeably. 508 '-Wno-mismatched-tags', 509 ]) 510 511 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin']) 512 513 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as 514 # opposed to libstdc++, as the later is dated. 515 if sys.platform == "darwin": 516 main.Append(CXXFLAGS=['-stdlib=libc++']) 517 main.Append(LIBS=['c++']) 518 519 # On FreeBSD we need libthr. 520 if sys.platform.startswith('freebsd'): 521 main.Append(LIBS=['thr']) 522 523 # We require clang >= 3.1, so there is no need to check any 524 # versions here. 525 if GetOption('with_ubsan'): 526 if GetOption('with_asan'): 527 main.Append(CCFLAGS=['-fsanitize=address,undefined', 528 '-fno-omit-frame-pointer'], 529 LINKFLAGS='-fsanitize=address,undefined') 530 else: 531 main.Append(CCFLAGS='-fsanitize=undefined', 532 LINKFLAGS='-fsanitize=undefined') 533 534 elif GetOption('with_asan'): 535 main.Append(CCFLAGS=['-fsanitize=address', 536 '-fno-omit-frame-pointer'], 537 LINKFLAGS='-fsanitize=address') 538 539else: 540 print(termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, end=' ') 541 print("Don't know what compiler options to use for your compiler.") 542 print(termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX']) 543 print(termcap.Yellow + ' version:' + termcap.Normal, end=' ') 544 if not CXX_version: 545 print(termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" + 546 termcap.Normal) 547 else: 548 print(CXX_version.replace('\n', '<nl>')) 549 print(" If you're trying to use a compiler other than GCC") 550 print(" or clang, there appears to be something wrong with your") 551 print(" environment.") 552 print(" ") 553 print(" If you are trying to use a compiler other than those listed") 554 print(" above you will need to ease fix SConstruct and ") 555 print(" src/SConscript to support that compiler.") 556 Exit(1) 557 558# Set up common yacc/bison flags (needed for Ruby) 559main['YACCFLAGS'] = '-d' 560main['YACCHXXFILESUFFIX'] = '.hh' 561 562# Do this after we save setting back, or else we'll tack on an 563# extra 'qdo' every time we run scons. 564if main['BATCH']: 565 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 566 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 567 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 568 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 569 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 570 571if sys.platform == 'cygwin': 572 # cygwin has some header file issues... 573 main.Append(CCFLAGS=["-Wno-uninitialized"]) 574 575# Check for the protobuf compiler 576protoc_version = readCommand([main['PROTOC'], '--version'], 577 exception='').split() 578 579# First two words should be "libprotoc x.y.z" 580if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc': 581 print(termcap.Yellow + termcap.Bold + 582 'Warning: Protocol buffer compiler (protoc) not found.\n' + 583 ' Please install protobuf-compiler for tracing support.' + 584 termcap.Normal) 585 main['PROTOC'] = False 586else: 587 # Based on the availability of the compress stream wrappers, 588 # require 2.1.0 589 min_protoc_version = '2.1.0' 590 if compareVersions(protoc_version[1], min_protoc_version) < 0: 591 print(termcap.Yellow + termcap.Bold + 592 'Warning: protoc version', min_protoc_version, 593 'or newer required.\n' + 594 ' Installed version:', protoc_version[1], 595 termcap.Normal) 596 main['PROTOC'] = False 597 else: 598 # Attempt to determine the appropriate include path and 599 # library path using pkg-config, that means we also need to 600 # check for pkg-config. Note that it is possible to use 601 # protobuf without the involvement of pkg-config. Later on we 602 # check go a library config check and at that point the test 603 # will fail if libprotobuf cannot be found. 604 if readCommand(['pkg-config', '--version'], exception=''): 605 try: 606 # Attempt to establish what linking flags to add for protobuf 607 # using pkg-config 608 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf') 609 except: 610 print(termcap.Yellow + termcap.Bold + 611 'Warning: pkg-config could not get protobuf flags.' + 612 termcap.Normal) 613 614 615# Check for 'timeout' from GNU coreutils. If present, regressions will 616# be run with a time limit. We require version 8.13 since we rely on 617# support for the '--foreground' option. 618if sys.platform.startswith('freebsd'): 619 timeout_lines = readCommand(['gtimeout', '--version'], 620 exception='').splitlines() 621else: 622 timeout_lines = readCommand(['timeout', '--version'], 623 exception='').splitlines() 624# Get the first line and tokenize it 625timeout_version = timeout_lines[0].split() if timeout_lines else [] 626main['TIMEOUT'] = timeout_version and \ 627 compareVersions(timeout_version[-1], '8.13') >= 0 628 629# Add a custom Check function to test for structure members. 630def CheckMember(context, include, decl, member, include_quotes="<>"): 631 context.Message("Checking for member %s in %s..." % 632 (member, decl)) 633 text = """ 634#include %(header)s 635int main(){ 636 %(decl)s test; 637 (void)test.%(member)s; 638 return 0; 639}; 640""" % { "header" : include_quotes[0] + include + include_quotes[1], 641 "decl" : decl, 642 "member" : member, 643 } 644 645 ret = context.TryCompile(text, extension=".cc") 646 context.Result(ret) 647 return ret 648 649# Platform-specific configuration. Note again that we assume that all 650# builds under a given build root run on the same host platform. 651conf = Configure(main, 652 conf_dir = joinpath(build_root, '.scons_config'), 653 log_file = joinpath(build_root, 'scons_config.log'), 654 custom_tests = { 655 'CheckMember' : CheckMember, 656 }) 657 658# Check if we should compile a 64 bit binary on Mac OS X/Darwin 659try: 660 import platform 661 uname = platform.uname() 662 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 663 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 664 main.Append(CCFLAGS=['-arch', 'x86_64']) 665 main.Append(CFLAGS=['-arch', 'x86_64']) 666 main.Append(LINKFLAGS=['-arch', 'x86_64']) 667 main.Append(ASFLAGS=['-arch', 'x86_64']) 668except: 669 pass 670 671# Recent versions of scons substitute a "Null" object for Configure() 672# when configuration isn't necessary, e.g., if the "--help" option is 673# present. Unfortuantely this Null object always returns false, 674# breaking all our configuration checks. We replace it with our own 675# more optimistic null object that returns True instead. 676if not conf: 677 def NullCheck(*args, **kwargs): 678 return True 679 680 class NullConf: 681 def __init__(self, env): 682 self.env = env 683 def Finish(self): 684 return self.env 685 def __getattr__(self, mname): 686 return NullCheck 687 688 conf = NullConf(main) 689 690# Cache build files in the supplied directory. 691if main['M5_BUILD_CACHE']: 692 print('Using build cache located at', main['M5_BUILD_CACHE']) 693 CacheDir(main['M5_BUILD_CACHE']) 694 695main['USE_PYTHON'] = not GetOption('without_python') 696if main['USE_PYTHON']: 697 # Find Python include and library directories for embedding the 698 # interpreter. We rely on python-config to resolve the appropriate 699 # includes and linker flags. ParseConfig does not seem to understand 700 # the more exotic linker flags such as -Xlinker and -export-dynamic so 701 # we add them explicitly below. If you want to link in an alternate 702 # version of python, see above for instructions on how to invoke 703 # scons with the appropriate PATH set. 704 # 705 # First we check if python2-config exists, else we use python-config 706 python_config = readCommand(['which', 'python2-config'], 707 exception='').strip() 708 if not os.path.exists(python_config): 709 python_config = readCommand(['which', 'python-config'], 710 exception='').strip() 711 py_includes = readCommand([python_config, '--includes'], 712 exception='').split() 713 # Strip the -I from the include folders before adding them to the 714 # CPPPATH 715 main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes)) 716 717 # Read the linker flags and split them into libraries and other link 718 # flags. The libraries are added later through the call the CheckLib. 719 py_ld_flags = readCommand([python_config, '--ldflags'], 720 exception='').split() 721 py_libs = [] 722 for lib in py_ld_flags: 723 if not lib.startswith('-l'): 724 main.Append(LINKFLAGS=[lib]) 725 else: 726 lib = lib[2:] 727 if lib not in py_libs: 728 py_libs.append(lib) 729 730 # verify that this stuff works 731 if not conf.CheckHeader('Python.h', '<>'): 732 print("Error: Check failed for Python.h header in", py_includes) 733 print("Two possible reasons:") 734 print("1. Python headers are not installed (You can install the " 735 "package python-dev on Ubuntu and RedHat)") 736 print("2. SCons is using a wrong C compiler. This can happen if " 737 "CC has the wrong value.") 738 print("CC = %s" % main['CC']) 739 Exit(1) 740 741 for lib in py_libs: 742 if not conf.CheckLib(lib): 743 print("Error: can't find library %s required by python" % lib) 744 Exit(1) 745 746# On Solaris you need to use libsocket for socket ops 747if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 748 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 749 print("Can't find library with socket calls (e.g. accept())") 750 Exit(1) 751 752# Check for zlib. If the check passes, libz will be automatically 753# added to the LIBS environment variable. 754if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 755 print('Error: did not find needed zlib compression library ' 756 'and/or zlib.h header file.') 757 print(' Please install zlib and try again.') 758 Exit(1) 759 760# If we have the protobuf compiler, also make sure we have the 761# development libraries. If the check passes, libprotobuf will be 762# automatically added to the LIBS environment variable. After 763# this, we can use the HAVE_PROTOBUF flag to determine if we have 764# got both protoc and libprotobuf available. 765main['HAVE_PROTOBUF'] = main['PROTOC'] and \ 766 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h', 767 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;') 768 769# Valgrind gets much less confused if you tell it when you're using 770# alternative stacks. 771main['HAVE_VALGRIND'] = conf.CheckCHeader('valgrind/valgrind.h') 772 773# If we have the compiler but not the library, print another warning. 774if main['PROTOC'] and not main['HAVE_PROTOBUF']: 775 print(termcap.Yellow + termcap.Bold + 776 'Warning: did not find protocol buffer library and/or headers.\n' + 777 ' Please install libprotobuf-dev for tracing support.' + 778 termcap.Normal) 779 780# Check for librt. 781have_posix_clock = \ 782 conf.CheckLibWithHeader(None, 'time.h', 'C', 783 'clock_nanosleep(0,0,NULL,NULL);') or \ 784 conf.CheckLibWithHeader('rt', 'time.h', 'C', 785 'clock_nanosleep(0,0,NULL,NULL);') 786 787have_posix_timers = \ 788 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C', 789 'timer_create(CLOCK_MONOTONIC, NULL, NULL);') 790 791if not GetOption('without_tcmalloc'): 792 if conf.CheckLib('tcmalloc'): 793 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 794 elif conf.CheckLib('tcmalloc_minimal'): 795 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 796 else: 797 print(termcap.Yellow + termcap.Bold + 798 "You can get a 12% performance improvement by " 799 "installing tcmalloc (libgoogle-perftools-dev package " 800 "on Ubuntu or RedHat)." + termcap.Normal) 801 802 803# Detect back trace implementations. The last implementation in the 804# list will be used by default. 805backtrace_impls = [ "none" ] 806 807backtrace_checker = 'char temp;' + \ 808 ' backtrace_symbols_fd((void*)&temp, 0, 0);' 809if conf.CheckLibWithHeader(None, 'execinfo.h', 'C', backtrace_checker): 810 backtrace_impls.append("glibc") 811elif conf.CheckLibWithHeader('execinfo', 'execinfo.h', 'C', 812 backtrace_checker): 813 # NetBSD and FreeBSD need libexecinfo. 814 backtrace_impls.append("glibc") 815 main.Append(LIBS=['execinfo']) 816 817if backtrace_impls[-1] == "none": 818 default_backtrace_impl = "none" 819 print(termcap.Yellow + termcap.Bold + 820 "No suitable back trace implementation found." + 821 termcap.Normal) 822 823if not have_posix_clock: 824 print("Can't find library for POSIX clocks.") 825 826# Check for <fenv.h> (C99 FP environment control) 827have_fenv = conf.CheckHeader('fenv.h', '<>') 828if not have_fenv: 829 print("Warning: Header file <fenv.h> not found.") 830 print(" This host has no IEEE FP rounding mode control.") 831 832# Check for <png.h> (libpng library needed if wanting to dump 833# frame buffer image in png format) 834have_png = conf.CheckHeader('png.h', '<>') 835if not have_png: 836 print("Warning: Header file <png.h> not found.") 837 print(" This host has no libpng library.") 838 print(" Disabling support for PNG framebuffers.") 839 840# Check if we should enable KVM-based hardware virtualization. The API 841# we rely on exists since version 2.6.36 of the kernel, but somehow 842# the KVM_API_VERSION does not reflect the change. We test for one of 843# the types as a fall back. 844have_kvm = conf.CheckHeader('linux/kvm.h', '<>') 845if not have_kvm: 846 print("Info: Compatible header file <linux/kvm.h> not found, " 847 "disabling KVM support.") 848 849# Check if the TUN/TAP driver is available. 850have_tuntap = conf.CheckHeader('linux/if_tun.h', '<>') 851if not have_tuntap: 852 print("Info: Compatible header file <linux/if_tun.h> not found.") 853 854# x86 needs support for xsave. We test for the structure here since we 855# won't be able to run new tests by the time we know which ISA we're 856# targeting. 857have_kvm_xsave = conf.CheckTypeSize('struct kvm_xsave', 858 '#include <linux/kvm.h>') != 0 859 860# Check if the requested target ISA is compatible with the host 861def is_isa_kvm_compatible(isa): 862 try: 863 import platform 864 host_isa = platform.machine() 865 except: 866 print("Warning: Failed to determine host ISA.") 867 return False 868 869 if not have_posix_timers: 870 print("Warning: Can not enable KVM, host seems to lack support " 871 "for POSIX timers") 872 return False 873 874 if isa == "arm": 875 return host_isa in ( "armv7l", "aarch64" ) 876 elif isa == "x86": 877 if host_isa != "x86_64": 878 return False 879 880 if not have_kvm_xsave: 881 print("KVM on x86 requires xsave support in kernel headers.") 882 return False 883 884 return True 885 else: 886 return False 887 888 889# Check if the exclude_host attribute is available. We want this to 890# get accurate instruction counts in KVM. 891main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember( 892 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host') 893 894 895###################################################################### 896# 897# Finish the configuration 898# 899main = conf.Finish() 900 901###################################################################### 902# 903# Collect all non-global variables 904# 905 906# Define the universe of supported ISAs 907all_isa_list = [ ] 908all_gpu_isa_list = [ ] 909Export('all_isa_list') 910Export('all_gpu_isa_list') 911 912class CpuModel(object): 913 '''The CpuModel class encapsulates everything the ISA parser needs to 914 know about a particular CPU model.''' 915 916 # Dict of available CPU model objects. Accessible as CpuModel.dict. 917 dict = {} 918 919 # Constructor. Automatically adds models to CpuModel.dict. 920 def __init__(self, name, default=False): 921 self.name = name # name of model 922 923 # This cpu is enabled by default 924 self.default = default 925 926 # Add self to dict 927 if name in CpuModel.dict: 928 raise AttributeError, "CpuModel '%s' already registered" % name 929 CpuModel.dict[name] = self 930 931Export('CpuModel') 932 933# Sticky variables get saved in the variables file so they persist from 934# one invocation to the next (unless overridden, in which case the new 935# value becomes sticky). 936sticky_vars = Variables(args=ARGUMENTS) 937Export('sticky_vars') 938 939# Sticky variables that should be exported 940export_vars = [] 941Export('export_vars') 942 943# For Ruby 944all_protocols = [] 945Export('all_protocols') 946protocol_dirs = [] 947Export('protocol_dirs') 948slicc_includes = [] 949Export('slicc_includes') 950 951# Walk the tree and execute all SConsopts scripts that wil add to the 952# above variables 953if GetOption('verbose'): 954 print("Reading SConsopts") 955for bdir in [ base_dir ] + extras_dir_list: 956 if not isdir(bdir): 957 print("Error: directory '%s' does not exist" % bdir) 958 Exit(1) 959 for root, dirs, files in os.walk(bdir): 960 if 'SConsopts' in files: 961 if GetOption('verbose'): 962 print("Reading", joinpath(root, 'SConsopts')) 963 SConscript(joinpath(root, 'SConsopts')) 964 965all_isa_list.sort() 966all_gpu_isa_list.sort() 967 968sticky_vars.AddVariables( 969 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 970 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'hsail', all_gpu_isa_list), 971 ListVariable('CPU_MODELS', 'CPU models', 972 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 973 sorted(CpuModel.dict.keys())), 974 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 975 False), 976 BoolVariable('SS_COMPATIBLE_FP', 977 'Make floating-point results compatible with SimpleScalar', 978 False), 979 BoolVariable('USE_SSE2', 980 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 981 False), 982 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 983 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 984 BoolVariable('USE_PNG', 'Enable support for PNG images', have_png), 985 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', 986 False), 987 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', 988 have_kvm), 989 BoolVariable('USE_TUNTAP', 990 'Enable using a tap device to bridge to the host network', 991 have_tuntap), 992 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False), 993 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None', 994 all_protocols), 995 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation', 996 backtrace_impls[-1], backtrace_impls) 997 ) 998 999# These variables get exported to #defines in config/*.hh (see src/SConscript). 1000export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'TARGET_GPU_ISA', 1001 'CP_ANNOTATE', 'USE_POSIX_CLOCK', 'USE_KVM', 'USE_TUNTAP', 1002 'PROTOCOL', 'HAVE_PROTOBUF', 'HAVE_VALGRIND', 1003 'HAVE_PERF_ATTR_EXCLUDE_HOST', 'USE_PNG'] 1004 1005################################################### 1006# 1007# Define a SCons builder for configuration flag headers. 1008# 1009################################################### 1010 1011# This function generates a config header file that #defines the 1012# variable symbol to the current variable setting (0 or 1). The source 1013# operands are the name of the variable and a Value node containing the 1014# value of the variable. 1015def build_config_file(target, source, env): 1016 (variable, value) = [s.get_contents() for s in source] 1017 f = file(str(target[0]), 'w') 1018 print('#define', variable, value, file=f) 1019 f.close() 1020 return None 1021 1022# Combine the two functions into a scons Action object. 1023config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 1024 1025# The emitter munges the source & target node lists to reflect what 1026# we're really doing. 1027def config_emitter(target, source, env): 1028 # extract variable name from Builder arg 1029 variable = str(target[0]) 1030 # True target is config header file 1031 target = joinpath('config', variable.lower() + '.hh') 1032 val = env[variable] 1033 if isinstance(val, bool): 1034 # Force value to 0/1 1035 val = int(val) 1036 elif isinstance(val, str): 1037 val = '"' + val + '"' 1038 1039 # Sources are variable name & value (packaged in SCons Value nodes) 1040 return ([target], [Value(variable), Value(val)]) 1041 1042config_builder = Builder(emitter = config_emitter, action = config_action) 1043 1044main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 1045 1046################################################### 1047# 1048# Builders for static and shared partially linked object files. 1049# 1050################################################### 1051 1052partial_static_builder = Builder(action=SCons.Defaults.LinkAction, 1053 src_suffix='$OBJSUFFIX', 1054 src_builder=['StaticObject', 'Object'], 1055 LINKFLAGS='$PLINKFLAGS', 1056 LIBS='') 1057 1058def partial_shared_emitter(target, source, env): 1059 for tgt in target: 1060 tgt.attributes.shared = 1 1061 return (target, source) 1062partial_shared_builder = Builder(action=SCons.Defaults.ShLinkAction, 1063 emitter=partial_shared_emitter, 1064 src_suffix='$SHOBJSUFFIX', 1065 src_builder='SharedObject', 1066 SHLINKFLAGS='$PSHLINKFLAGS', 1067 LIBS='') 1068 1069main.Append(BUILDERS = { 'PartialShared' : partial_shared_builder, 1070 'PartialStatic' : partial_static_builder }) 1071 1072# builds in ext are shared across all configs in the build root. 1073ext_dir = abspath(joinpath(str(main.root), 'ext')) 1074ext_build_dirs = [] 1075for root, dirs, files in os.walk(ext_dir): 1076 if 'SConscript' in files: 1077 build_dir = os.path.relpath(root, ext_dir) 1078 ext_build_dirs.append(build_dir) 1079 main.SConscript(joinpath(root, 'SConscript'), 1080 variant_dir=joinpath(build_root, build_dir)) 1081 1082main.Prepend(CPPPATH=Dir('ext/pybind11/include/')) 1083 1084################################################### 1085# 1086# This builder and wrapper method are used to set up a directory with 1087# switching headers. Those are headers which are in a generic location and 1088# that include more specific headers from a directory chosen at build time 1089# based on the current build settings. 1090# 1091################################################### 1092 1093def build_switching_header(target, source, env): 1094 path = str(target[0]) 1095 subdir = str(source[0]) 1096 dp, fp = os.path.split(path) 1097 dp = os.path.relpath(os.path.realpath(dp), 1098 os.path.realpath(env['BUILDDIR'])) 1099 with open(path, 'w') as hdr: 1100 print('#include "%s/%s/%s"' % (dp, subdir, fp), file=hdr) 1101 1102switching_header_action = MakeAction(build_switching_header, 1103 Transform('GENERATE')) 1104 1105switching_header_builder = Builder(action=switching_header_action, 1106 source_factory=Value, 1107 single_source=True) 1108 1109main.Append(BUILDERS = { 'SwitchingHeader': switching_header_builder }) 1110 1111def switching_headers(self, headers, source): 1112 for header in headers: 1113 self.SwitchingHeader(header, source) 1114 1115main.AddMethod(switching_headers, 'SwitchingHeaders') 1116 1117################################################### 1118# 1119# Define build environments for selected configurations. 1120# 1121################################################### 1122 1123for variant_path in variant_paths: 1124 if not GetOption('silent'): 1125 print("Building in", variant_path) 1126 1127 # Make a copy of the build-root environment to use for this config. 1128 env = main.Clone() 1129 env['BUILDDIR'] = variant_path 1130 1131 # variant_dir is the tail component of build path, and is used to 1132 # determine the build parameters (e.g., 'ALPHA_SE') 1133 (build_root, variant_dir) = splitpath(variant_path) 1134 1135 # Set env variables according to the build directory config. 1136 sticky_vars.files = [] 1137 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 1138 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 1139 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 1140 current_vars_file = joinpath(build_root, 'variables', variant_dir) 1141 if isfile(current_vars_file): 1142 sticky_vars.files.append(current_vars_file) 1143 if not GetOption('silent'): 1144 print("Using saved variables file %s" % current_vars_file) 1145 elif variant_dir in ext_build_dirs: 1146 # Things in ext are built without a variant directory. 1147 continue 1148 else: 1149 # Build dir-specific variables file doesn't exist. 1150 1151 # Make sure the directory is there so we can create it later 1152 opt_dir = dirname(current_vars_file) 1153 if not isdir(opt_dir): 1154 mkdir(opt_dir) 1155 1156 # Get default build variables from source tree. Variables are 1157 # normally determined by name of $VARIANT_DIR, but can be 1158 # overridden by '--default=' arg on command line. 1159 default = GetOption('default') 1160 opts_dir = joinpath(main.root.abspath, 'build_opts') 1161 if default: 1162 default_vars_files = [joinpath(build_root, 'variables', default), 1163 joinpath(opts_dir, default)] 1164 else: 1165 default_vars_files = [joinpath(opts_dir, variant_dir)] 1166 existing_files = filter(isfile, default_vars_files) 1167 if existing_files: 1168 default_vars_file = existing_files[0] 1169 sticky_vars.files.append(default_vars_file) 1170 print("Variables file %s not found,\n using defaults in %s" 1171 % (current_vars_file, default_vars_file)) 1172 else: 1173 print("Error: cannot find variables file %s or " 1174 "default file(s) %s" 1175 % (current_vars_file, ' or '.join(default_vars_files))) 1176 Exit(1) 1177 1178 # Apply current variable settings to env 1179 sticky_vars.Update(env) 1180 1181 help_texts["local_vars"] += \ 1182 "Build variables for %s:\n" % variant_dir \ 1183 + sticky_vars.GenerateHelpText(env) 1184 1185 # Process variable settings. 1186 1187 if not have_fenv and env['USE_FENV']: 1188 print("Warning: <fenv.h> not available; " 1189 "forcing USE_FENV to False in", variant_dir + ".") 1190 env['USE_FENV'] = False 1191 1192 if not env['USE_FENV']: 1193 print("Warning: No IEEE FP rounding mode control in", 1194 variant_dir + ".") 1195 print(" FP results may deviate slightly from other platforms.") 1196 1197 if not have_png and env['USE_PNG']: 1198 print("Warning: <png.h> not available; " 1199 "forcing USE_PNG to False in", variant_dir + ".") 1200 env['USE_PNG'] = False 1201 1202 if env['USE_PNG']: 1203 env.Append(LIBS=['png']) 1204 1205 if env['EFENCE']: 1206 env.Append(LIBS=['efence']) 1207 1208 if env['USE_KVM']: 1209 if not have_kvm: 1210 print("Warning: Can not enable KVM, host seems to " 1211 "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