SConstruct revision 11476
1# -*- mode:python -*- 2 3# Copyright (c) 2013, 2015, 2016 ARM Limited 4# All rights reserved. 5# 6# The license below extends only to copyright in the software and shall 7# not be construed as granting a license to any other intellectual 8# property including but not limited to intellectual property relating 9# to a hardware implementation of the functionality of the software 10# licensed hereunder. You may use the software subject to the license 11# terms below provided that you ensure that this notice is replicated 12# unmodified and in its entirety in all distributions of the software, 13# modified or unmodified, in source code or in binary form. 14# 15# Copyright (c) 2011 Advanced Micro Devices, Inc. 16# Copyright (c) 2009 The Hewlett-Packard Development Company 17# Copyright (c) 2004-2005 The Regents of The University of Michigan 18# All rights reserved. 19# 20# Redistribution and use in source and binary forms, with or without 21# modification, are permitted provided that the following conditions are 22# met: redistributions of source code must retain the above copyright 23# notice, this list of conditions and the following disclaimer; 24# redistributions in binary form must reproduce the above copyright 25# notice, this list of conditions and the following disclaimer in the 26# documentation and/or other materials provided with the distribution; 27# neither the name of the copyright holders nor the names of its 28# contributors may be used to endorse or promote products derived from 29# this software without specific prior written permission. 30# 31# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 34# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 36# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 37# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 38# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 39# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 40# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 41# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42# 43# Authors: Steve Reinhardt 44# Nathan Binkert 45 46################################################### 47# 48# SCons top-level build description (SConstruct) file. 49# 50# While in this directory ('gem5'), just type 'scons' to build the default 51# configuration (see below), or type 'scons build/<CONFIG>/<binary>' 52# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for 53# the optimized full-system version). 54# 55# You can build gem5 in a different directory as long as there is a 56# 'build/<CONFIG>' somewhere along the target path. The build system 57# expects that all configs under the same build directory are being 58# built for the same host system. 59# 60# Examples: 61# 62# The following two commands are equivalent. The '-u' option tells 63# scons to search up the directory tree for this SConstruct file. 64# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug 65# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug 66# 67# The following two commands are equivalent and demonstrate building 68# in a directory outside of the source tree. The '-C' option tells 69# scons to chdir to the specified directory to find this SConstruct 70# file. 71# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug 72# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug 73# 74# You can use 'scons -H' to print scons options. If you're in this 75# 'gem5' directory (or use -u or -C to tell scons where to find this 76# file), you can use 'scons -h' to print all the gem5-specific build 77# options as well. 78# 79################################################### 80 81# Check for recent-enough Python and SCons versions. 82try: 83 # Really old versions of scons only take two options for the 84 # function, so check once without the revision and once with the 85 # revision, the first instance will fail for stuff other than 86 # 0.98, and the second will fail for 0.98.0 87 EnsureSConsVersion(0, 98) 88 EnsureSConsVersion(0, 98, 1) 89except SystemExit, e: 90 print """ 91For more details, see: 92 http://gem5.org/Dependencies 93""" 94 raise 95 96# We ensure the python version early because because python-config 97# requires python 2.5 98try: 99 EnsurePythonVersion(2, 5) 100except SystemExit, e: 101 print """ 102You can use a non-default installation of the Python interpreter by 103rearranging your PATH so that scons finds the non-default 'python' and 104'python-config' first. 105 106For more details, see: 107 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation 108""" 109 raise 110 111# Global Python includes 112import itertools 113import os 114import re 115import shutil 116import subprocess 117import sys 118 119from os import mkdir, environ 120from os.path import abspath, basename, dirname, expanduser, normpath 121from os.path import exists, isdir, isfile 122from os.path import join as joinpath, split as splitpath 123 124# SCons includes 125import SCons 126import SCons.Node 127 128extra_python_paths = [ 129 Dir('src/python').srcnode().abspath, # gem5 includes 130 Dir('ext/ply').srcnode().abspath, # ply is used by several files 131 ] 132 133sys.path[1:1] = extra_python_paths 134 135from m5.util import compareVersions, readCommand 136from m5.util.terminal import get_termcap 137 138help_texts = { 139 "options" : "", 140 "global_vars" : "", 141 "local_vars" : "" 142} 143 144Export("help_texts") 145 146 147# There's a bug in scons in that (1) by default, the help texts from 148# AddOption() are supposed to be displayed when you type 'scons -h' 149# and (2) you can override the help displayed by 'scons -h' using the 150# Help() function, but these two features are incompatible: once 151# you've overridden the help text using Help(), there's no way to get 152# at the help texts from AddOptions. See: 153# http://scons.tigris.org/issues/show_bug.cgi?id=2356 154# http://scons.tigris.org/issues/show_bug.cgi?id=2611 155# This hack lets us extract the help text from AddOptions and 156# re-inject it via Help(). Ideally someday this bug will be fixed and 157# we can just use AddOption directly. 158def AddLocalOption(*args, **kwargs): 159 col_width = 30 160 161 help = " " + ", ".join(args) 162 if "help" in kwargs: 163 length = len(help) 164 if length >= col_width: 165 help += "\n" + " " * col_width 166 else: 167 help += " " * (col_width - length) 168 help += kwargs["help"] 169 help_texts["options"] += help + "\n" 170 171 AddOption(*args, **kwargs) 172 173AddLocalOption('--colors', dest='use_colors', action='store_true', 174 help="Add color to abbreviated scons output") 175AddLocalOption('--no-colors', dest='use_colors', action='store_false', 176 help="Don't add color to abbreviated scons output") 177AddLocalOption('--with-cxx-config', dest='with_cxx_config', 178 action='store_true', 179 help="Build with support for C++-based configuration") 180AddLocalOption('--default', dest='default', type='string', action='store', 181 help='Override which build_opts file to use for defaults') 182AddLocalOption('--ignore-style', dest='ignore_style', action='store_true', 183 help='Disable style checking hooks') 184AddLocalOption('--no-lto', dest='no_lto', action='store_true', 185 help='Disable Link-Time Optimization for fast') 186AddLocalOption('--update-ref', dest='update_ref', action='store_true', 187 help='Update test reference outputs') 188AddLocalOption('--verbose', dest='verbose', action='store_true', 189 help='Print full tool command lines') 190AddLocalOption('--without-python', dest='without_python', 191 action='store_true', 192 help='Build without Python configuration support') 193AddLocalOption('--without-tcmalloc', dest='without_tcmalloc', 194 action='store_true', 195 help='Disable linking against tcmalloc') 196AddLocalOption('--with-ubsan', dest='with_ubsan', action='store_true', 197 help='Build with Undefined Behavior Sanitizer if available') 198AddLocalOption('--with-asan', dest='with_asan', action='store_true', 199 help='Build with Address Sanitizer if available') 200 201termcap = get_termcap(GetOption('use_colors')) 202 203######################################################################## 204# 205# Set up the main build environment. 206# 207######################################################################## 208 209# export TERM so that clang reports errors in color 210use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH', 211 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC', 212 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ]) 213 214use_prefixes = [ 215 "ASAN_", # address sanitizer symbolizer path and settings 216 "CCACHE_", # ccache (caching compiler wrapper) configuration 217 "CCC_", # clang static analyzer configuration 218 "DISTCC_", # distcc (distributed compiler wrapper) configuration 219 "INCLUDE_SERVER_", # distcc pump server settings 220 "M5", # M5 configuration (e.g., path to kernels) 221 ] 222 223use_env = {} 224for key,val in sorted(os.environ.iteritems()): 225 if key in use_vars or \ 226 any([key.startswith(prefix) for prefix in use_prefixes]): 227 use_env[key] = val 228 229# Tell scons to avoid implicit command dependencies to avoid issues 230# with the param wrappes being compiled twice (see 231# http://scons.tigris.org/issues/show_bug.cgi?id=2811) 232main = Environment(ENV=use_env, IMPLICIT_COMMAND_DEPENDENCIES=0) 233main.Decider('MD5-timestamp') 234main.root = Dir(".") # The current directory (where this file lives). 235main.srcdir = Dir("src") # The source directory 236 237main_dict_keys = main.Dictionary().keys() 238 239# Check that we have a C/C++ compiler 240if not ('CC' in main_dict_keys and 'CXX' in main_dict_keys): 241 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)" 242 Exit(1) 243 244# Check that swig is present 245if not 'SWIG' in main_dict_keys: 246 print "swig is not installed (package swig on Ubuntu and RedHat)" 247 Exit(1) 248 249# add useful python code PYTHONPATH so it can be used by subprocesses 250# as well 251main.AppendENVPath('PYTHONPATH', extra_python_paths) 252 253######################################################################## 254# 255# Mercurial Stuff. 256# 257# If the gem5 directory is a mercurial repository, we should do some 258# extra things. 259# 260######################################################################## 261 262hgdir = main.root.Dir(".hg") 263 264 265style_message = """ 266You're missing the gem5 style hook, which automatically checks your code 267against the gem5 style rules on %s. 268This script will now install the hook in your %s. 269Press enter to continue, or ctrl-c to abort: """ 270 271mercurial_style_message = style_message % ("hg commit and qrefresh commands", 272 ".hg/hgrc file") 273git_style_message = style_message % ("'git commit'", 274 ".git/hooks/ directory") 275 276mercurial_style_upgrade_message = """ 277Your Mercurial style hooks are not up-to-date. This script will now 278try to automatically update them. A backup of your hgrc will be saved 279in .hg/hgrc.old. 280Press enter to continue, or ctrl-c to abort: """ 281 282mercurial_style_hook = """ 283# The following lines were automatically added by gem5/SConstruct 284# to provide the gem5 style-checking hooks 285[extensions] 286hgstyle = %s/util/hgstyle.py 287 288[hooks] 289pretxncommit.style = python:hgstyle.check_style 290pre-qrefresh.style = python:hgstyle.check_style 291# End of SConstruct additions 292 293""" % (main.root.abspath) 294 295mercurial_lib_not_found = """ 296Mercurial libraries cannot be found, ignoring style hook. If 297you are a gem5 developer, please fix this and run the style 298hook. It is important. 299""" 300 301# Check for style hook and prompt for installation if it's not there. 302# Skip this if --ignore-style was specified, there's no interactive 303# terminal to prompt, or no recognized revision control system can be 304# found. 305ignore_style = GetOption('ignore_style') or not sys.stdin.isatty() 306 307# Try wire up Mercurial to the style hooks 308if not ignore_style and hgdir.exists(): 309 style_hook = True 310 style_hooks = tuple() 311 hgrc = hgdir.File('hgrc') 312 hgrc_old = hgdir.File('hgrc.old') 313 try: 314 from mercurial import ui 315 ui = ui.ui() 316 ui.readconfig(hgrc.abspath) 317 style_hooks = (ui.config('hooks', 'pretxncommit.style', None), 318 ui.config('hooks', 'pre-qrefresh.style', None)) 319 style_hook = all(style_hooks) 320 style_extension = ui.config('extensions', 'style', None) 321 except ImportError: 322 print mercurial_lib_not_found 323 324 if "python:style.check_style" in style_hooks: 325 # Try to upgrade the style hooks 326 print mercurial_style_upgrade_message 327 # continue unless user does ctrl-c/ctrl-d etc. 328 try: 329 raw_input() 330 except: 331 print "Input exception, exiting scons.\n" 332 sys.exit(1) 333 shutil.copyfile(hgrc.abspath, hgrc_old.abspath) 334 re_style_hook = re.compile(r"^([^=#]+)\.style\s*=\s*([^#\s]+).*") 335 re_style_extension = re.compile("style\s*=\s*([^#\s]+).*") 336 old, new = open(hgrc_old.abspath, 'r'), open(hgrc.abspath, 'w') 337 for l in old: 338 m_hook = re_style_hook.match(l) 339 m_ext = re_style_extension.match(l) 340 if m_hook: 341 hook, check = m_hook.groups() 342 if check != "python:style.check_style": 343 print "Warning: %s.style is using a non-default " \ 344 "checker: %s" % (hook, check) 345 if hook not in ("pretxncommit", "pre-qrefresh"): 346 print "Warning: Updating unknown style hook: %s" % hook 347 348 l = "%s.style = python:hgstyle.check_style\n" % hook 349 elif m_ext and m_ext.group(1) == style_extension: 350 l = "hgstyle = %s/util/hgstyle.py\n" % main.root.abspath 351 352 new.write(l) 353 elif not style_hook: 354 print mercurial_style_message, 355 # continue unless user does ctrl-c/ctrl-d etc. 356 try: 357 raw_input() 358 except: 359 print "Input exception, exiting scons.\n" 360 sys.exit(1) 361 hgrc_path = '%s/.hg/hgrc' % main.root.abspath 362 print "Adding style hook to", hgrc_path, "\n" 363 try: 364 with open(hgrc_path, 'a') as f: 365 f.write(mercurial_style_hook) 366 except: 367 print "Error updating", hgrc_path 368 sys.exit(1) 369 370def install_git_style_hooks(): 371 try: 372 gitdir = Dir(readCommand( 373 ["git", "rev-parse", "--git-dir"]).strip("\n")) 374 except Exception, e: 375 print "Warning: Failed to find git repo directory: %s" % e 376 return 377 378 git_hooks = gitdir.Dir("hooks") 379 git_pre_commit_hook = git_hooks.File("pre-commit") 380 git_style_script = File("util/git-pre-commit.py") 381 382 if git_pre_commit_hook.exists(): 383 return 384 385 print git_style_message, 386 try: 387 raw_input() 388 except: 389 print "Input exception, exiting scons.\n" 390 sys.exit(1) 391 392 if not git_hooks.exists(): 393 mkdir(git_hooks.get_abspath()) 394 395 # Use a relative symlink if the hooks live in the source directory 396 if git_pre_commit_hook.is_under(main.root): 397 script_path = os.path.relpath( 398 git_style_script.get_abspath(), 399 git_pre_commit_hook.Dir(".").get_abspath()) 400 else: 401 script_path = git_style_script.get_abspath() 402 403 try: 404 os.symlink(script_path, git_pre_commit_hook.get_abspath()) 405 except: 406 print "Error updating git pre-commit hook" 407 raise 408 409# Try to wire up git to the style hooks 410if not ignore_style and main.root.Entry(".git").exists(): 411 install_git_style_hooks() 412 413################################################### 414# 415# Figure out which configurations to set up based on the path(s) of 416# the target(s). 417# 418################################################### 419 420# Find default configuration & binary. 421Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug')) 422 423# helper function: find last occurrence of element in list 424def rfind(l, elt, offs = -1): 425 for i in range(len(l)+offs, 0, -1): 426 if l[i] == elt: 427 return i 428 raise ValueError, "element not found" 429 430# Take a list of paths (or SCons Nodes) and return a list with all 431# paths made absolute and ~-expanded. Paths will be interpreted 432# relative to the launch directory unless a different root is provided 433def makePathListAbsolute(path_list, root=GetLaunchDir()): 434 return [abspath(joinpath(root, expanduser(str(p)))) 435 for p in path_list] 436 437# Each target must have 'build' in the interior of the path; the 438# directory below this will determine the build parameters. For 439# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we 440# recognize that ALPHA_SE specifies the configuration because it 441# follow 'build' in the build path. 442 443# The funky assignment to "[:]" is needed to replace the list contents 444# in place rather than reassign the symbol to a new list, which 445# doesn't work (obviously!). 446BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS) 447 448# Generate a list of the unique build roots and configs that the 449# collected targets reference. 450variant_paths = [] 451build_root = None 452for t in BUILD_TARGETS: 453 path_dirs = t.split('/') 454 try: 455 build_top = rfind(path_dirs, 'build', -2) 456 except: 457 print "Error: no non-leaf 'build' dir found on target path", t 458 Exit(1) 459 this_build_root = joinpath('/',*path_dirs[:build_top+1]) 460 if not build_root: 461 build_root = this_build_root 462 else: 463 if this_build_root != build_root: 464 print "Error: build targets not under same build root\n"\ 465 " %s\n %s" % (build_root, this_build_root) 466 Exit(1) 467 variant_path = joinpath('/',*path_dirs[:build_top+2]) 468 if variant_path not in variant_paths: 469 variant_paths.append(variant_path) 470 471# Make sure build_root exists (might not if this is the first build there) 472if not isdir(build_root): 473 mkdir(build_root) 474main['BUILDROOT'] = build_root 475 476Export('main') 477 478main.SConsignFile(joinpath(build_root, "sconsign")) 479 480# Default duplicate option is to use hard links, but this messes up 481# when you use emacs to edit a file in the target dir, as emacs moves 482# file to file~ then copies to file, breaking the link. Symbolic 483# (soft) links work better. 484main.SetOption('duplicate', 'soft-copy') 485 486# 487# Set up global sticky variables... these are common to an entire build 488# tree (not specific to a particular build like ALPHA_SE) 489# 490 491global_vars_file = joinpath(build_root, 'variables.global') 492 493global_vars = Variables(global_vars_file, args=ARGUMENTS) 494 495global_vars.AddVariables( 496 ('CC', 'C compiler', environ.get('CC', main['CC'])), 497 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])), 498 ('SWIG', 'SWIG tool', environ.get('SWIG', main['SWIG'])), 499 ('PROTOC', 'protoc tool', environ.get('PROTOC', 'protoc')), 500 ('BATCH', 'Use batch pool for build and tests', False), 501 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'), 502 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False), 503 ('EXTRAS', 'Add extra directories to the compilation', '') 504 ) 505 506# Update main environment with values from ARGUMENTS & global_vars_file 507global_vars.Update(main) 508help_texts["global_vars"] += global_vars.GenerateHelpText(main) 509 510# Save sticky variable settings back to current variables file 511global_vars.Save(global_vars_file, main) 512 513# Parse EXTRAS variable to build list of all directories where we're 514# look for sources etc. This list is exported as extras_dir_list. 515base_dir = main.srcdir.abspath 516if main['EXTRAS']: 517 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':')) 518else: 519 extras_dir_list = [] 520 521Export('base_dir') 522Export('extras_dir_list') 523 524# the ext directory should be on the #includes path 525main.Append(CPPPATH=[Dir('ext')]) 526 527def strip_build_path(path, env): 528 path = str(path) 529 variant_base = env['BUILDROOT'] + os.path.sep 530 if path.startswith(variant_base): 531 path = path[len(variant_base):] 532 elif path.startswith('build/'): 533 path = path[6:] 534 return path 535 536# Generate a string of the form: 537# common/path/prefix/src1, src2 -> tgt1, tgt2 538# to print while building. 539class Transform(object): 540 # all specific color settings should be here and nowhere else 541 tool_color = termcap.Normal 542 pfx_color = termcap.Yellow 543 srcs_color = termcap.Yellow + termcap.Bold 544 arrow_color = termcap.Blue + termcap.Bold 545 tgts_color = termcap.Yellow + termcap.Bold 546 547 def __init__(self, tool, max_sources=99): 548 self.format = self.tool_color + (" [%8s] " % tool) \ 549 + self.pfx_color + "%s" \ 550 + self.srcs_color + "%s" \ 551 + self.arrow_color + " -> " \ 552 + self.tgts_color + "%s" \ 553 + termcap.Normal 554 self.max_sources = max_sources 555 556 def __call__(self, target, source, env, for_signature=None): 557 # truncate source list according to max_sources param 558 source = source[0:self.max_sources] 559 def strip(f): 560 return strip_build_path(str(f), env) 561 if len(source) > 0: 562 srcs = map(strip, source) 563 else: 564 srcs = [''] 565 tgts = map(strip, target) 566 # surprisingly, os.path.commonprefix is a dumb char-by-char string 567 # operation that has nothing to do with paths. 568 com_pfx = os.path.commonprefix(srcs + tgts) 569 com_pfx_len = len(com_pfx) 570 if com_pfx: 571 # do some cleanup and sanity checking on common prefix 572 if com_pfx[-1] == ".": 573 # prefix matches all but file extension: ok 574 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o' 575 com_pfx = com_pfx[0:-1] 576 elif com_pfx[-1] == "/": 577 # common prefix is directory path: OK 578 pass 579 else: 580 src0_len = len(srcs[0]) 581 tgt0_len = len(tgts[0]) 582 if src0_len == com_pfx_len: 583 # source is a substring of target, OK 584 pass 585 elif tgt0_len == com_pfx_len: 586 # target is a substring of source, need to back up to 587 # avoid empty string on RHS of arrow 588 sep_idx = com_pfx.rfind(".") 589 if sep_idx != -1: 590 com_pfx = com_pfx[0:sep_idx] 591 else: 592 com_pfx = '' 593 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".": 594 # still splitting at file extension: ok 595 pass 596 else: 597 # probably a fluke; ignore it 598 com_pfx = '' 599 # recalculate length in case com_pfx was modified 600 com_pfx_len = len(com_pfx) 601 def fmt(files): 602 f = map(lambda s: s[com_pfx_len:], files) 603 return ', '.join(f) 604 return self.format % (com_pfx, fmt(srcs), fmt(tgts)) 605 606Export('Transform') 607 608# enable the regression script to use the termcap 609main['TERMCAP'] = termcap 610 611if GetOption('verbose'): 612 def MakeAction(action, string, *args, **kwargs): 613 return Action(action, *args, **kwargs) 614else: 615 MakeAction = Action 616 main['CCCOMSTR'] = Transform("CC") 617 main['CXXCOMSTR'] = Transform("CXX") 618 main['ASCOMSTR'] = Transform("AS") 619 main['SWIGCOMSTR'] = Transform("SWIG") 620 main['ARCOMSTR'] = Transform("AR", 0) 621 main['LINKCOMSTR'] = Transform("LINK", 0) 622 main['RANLIBCOMSTR'] = Transform("RANLIB", 0) 623 main['M4COMSTR'] = Transform("M4") 624 main['SHCCCOMSTR'] = Transform("SHCC") 625 main['SHCXXCOMSTR'] = Transform("SHCXX") 626Export('MakeAction') 627 628# Initialize the Link-Time Optimization (LTO) flags 629main['LTO_CCFLAGS'] = [] 630main['LTO_LDFLAGS'] = [] 631 632# According to the readme, tcmalloc works best if the compiler doesn't 633# assume that we're using the builtin malloc and friends. These flags 634# are compiler-specific, so we need to set them after we detect which 635# compiler we're using. 636main['TCMALLOC_CCFLAGS'] = [] 637 638CXX_version = readCommand([main['CXX'],'--version'], exception=False) 639CXX_V = readCommand([main['CXX'],'-V'], exception=False) 640 641main['GCC'] = CXX_version and CXX_version.find('g++') >= 0 642main['CLANG'] = CXX_version and CXX_version.find('clang') >= 0 643if main['GCC'] + main['CLANG'] > 1: 644 print 'Error: How can we have two at the same time?' 645 Exit(1) 646 647# Set up default C++ compiler flags 648if main['GCC'] or main['CLANG']: 649 # As gcc and clang share many flags, do the common parts here 650 main.Append(CCFLAGS=['-pipe']) 651 main.Append(CCFLAGS=['-fno-strict-aliasing']) 652 # Enable -Wall and -Wextra and then disable the few warnings that 653 # we consistently violate 654 main.Append(CCFLAGS=['-Wall', '-Wundef', '-Wextra', 655 '-Wno-sign-compare', '-Wno-unused-parameter']) 656 # We always compile using C++11 657 main.Append(CXXFLAGS=['-std=c++11']) 658else: 659 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 660 print "Don't know what compiler options to use for your compiler." 661 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 662 print termcap.Yellow + ' version:' + termcap.Normal, 663 if not CXX_version: 664 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 665 termcap.Normal 666 else: 667 print CXX_version.replace('\n', '<nl>') 668 print " If you're trying to use a compiler other than GCC" 669 print " or clang, there appears to be something wrong with your" 670 print " environment." 671 print " " 672 print " If you are trying to use a compiler other than those listed" 673 print " above you will need to ease fix SConstruct and " 674 print " src/SConscript to support that compiler." 675 Exit(1) 676 677if main['GCC']: 678 # Check for a supported version of gcc. >= 4.7 is chosen for its 679 # level of c++11 support. See 680 # http://gcc.gnu.org/projects/cxx0x.html for details. 681 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 682 if compareVersions(gcc_version, "4.7") < 0: 683 print 'Error: gcc version 4.7 or newer required.' 684 print ' Installed version:', gcc_version 685 Exit(1) 686 687 main['GCC_VERSION'] = gcc_version 688 689 # gcc from version 4.8 and above generates "rep; ret" instructions 690 # to avoid performance penalties on certain AMD chips. Older 691 # assemblers detect this as an error, "Error: expecting string 692 # instruction after `rep'" 693 if compareVersions(gcc_version, "4.8") > 0: 694 as_version_raw = readCommand([main['AS'], '-v', '/dev/null'], 695 exception=False).split() 696 697 # version strings may contain extra distro-specific 698 # qualifiers, so play it safe and keep only what comes before 699 # the first hyphen 700 as_version = as_version_raw[-1].split('-')[0] if as_version_raw \ 701 else None 702 703 if not as_version or compareVersions(as_version, "2.23") < 0: 704 print termcap.Yellow + termcap.Bold + \ 705 'Warning: This combination of gcc and binutils have' + \ 706 ' known incompatibilities.\n' + \ 707 ' If you encounter build problems, please update ' + \ 708 'binutils to 2.23.' + \ 709 termcap.Normal 710 711 # Make sure we warn if the user has requested to compile with the 712 # Undefined Benahvior Sanitizer and this version of gcc does not 713 # support it. 714 if GetOption('with_ubsan') and \ 715 compareVersions(gcc_version, '4.9') < 0: 716 print termcap.Yellow + termcap.Bold + \ 717 'Warning: UBSan is only supported using gcc 4.9 and later.' + \ 718 termcap.Normal 719 720 # Add the appropriate Link-Time Optimization (LTO) flags 721 # unless LTO is explicitly turned off. Note that these flags 722 # are only used by the fast target. 723 if not GetOption('no_lto'): 724 # Pass the LTO flag when compiling to produce GIMPLE 725 # output, we merely create the flags here and only append 726 # them later 727 main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 728 729 # Use the same amount of jobs for LTO as we are running 730 # scons with 731 main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')] 732 733 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc', 734 '-fno-builtin-realloc', '-fno-builtin-free']) 735 736elif main['CLANG']: 737 # Check for a supported version of clang, >= 3.1 is needed to 738 # support similar features as gcc 4.7. See 739 # http://clang.llvm.org/cxx_status.html for details 740 clang_version_re = re.compile(".* version (\d+\.\d+)") 741 clang_version_match = clang_version_re.search(CXX_version) 742 if (clang_version_match): 743 clang_version = clang_version_match.groups()[0] 744 if compareVersions(clang_version, "3.1") < 0: 745 print 'Error: clang version 3.1 or newer required.' 746 print ' Installed version:', clang_version 747 Exit(1) 748 else: 749 print 'Error: Unable to determine clang version.' 750 Exit(1) 751 752 # clang has a few additional warnings that we disable, extraneous 753 # parantheses are allowed due to Ruby's printing of the AST, 754 # finally self assignments are allowed as the generated CPU code 755 # is relying on this 756 main.Append(CCFLAGS=['-Wno-parentheses', 757 '-Wno-self-assign', 758 # Some versions of libstdc++ (4.8?) seem to 759 # use struct hash and class hash 760 # interchangeably. 761 '-Wno-mismatched-tags', 762 ]) 763 764 main.Append(TCMALLOC_CCFLAGS=['-fno-builtin']) 765 766 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as 767 # opposed to libstdc++, as the later is dated. 768 if sys.platform == "darwin": 769 main.Append(CXXFLAGS=['-stdlib=libc++']) 770 main.Append(LIBS=['c++']) 771 772else: 773 print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal, 774 print "Don't know what compiler options to use for your compiler." 775 print termcap.Yellow + ' compiler:' + termcap.Normal, main['CXX'] 776 print termcap.Yellow + ' version:' + termcap.Normal, 777 if not CXX_version: 778 print termcap.Yellow + termcap.Bold + "COMMAND NOT FOUND!" +\ 779 termcap.Normal 780 else: 781 print CXX_version.replace('\n', '<nl>') 782 print " If you're trying to use a compiler other than GCC" 783 print " or clang, there appears to be something wrong with your" 784 print " environment." 785 print " " 786 print " If you are trying to use a compiler other than those listed" 787 print " above you will need to ease fix SConstruct and " 788 print " src/SConscript to support that compiler." 789 Exit(1) 790 791# Set up common yacc/bison flags (needed for Ruby) 792main['YACCFLAGS'] = '-d' 793main['YACCHXXFILESUFFIX'] = '.hh' 794 795# Do this after we save setting back, or else we'll tack on an 796# extra 'qdo' every time we run scons. 797if main['BATCH']: 798 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 799 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 800 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 801 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 802 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 803 804if sys.platform == 'cygwin': 805 # cygwin has some header file issues... 806 main.Append(CCFLAGS=["-Wno-uninitialized"]) 807 808# Check for the protobuf compiler 809protoc_version = readCommand([main['PROTOC'], '--version'], 810 exception='').split() 811 812# First two words should be "libprotoc x.y.z" 813if len(protoc_version) < 2 or protoc_version[0] != 'libprotoc': 814 print termcap.Yellow + termcap.Bold + \ 815 'Warning: Protocol buffer compiler (protoc) not found.\n' + \ 816 ' Please install protobuf-compiler for tracing support.' + \ 817 termcap.Normal 818 main['PROTOC'] = False 819else: 820 # Based on the availability of the compress stream wrappers, 821 # require 2.1.0 822 min_protoc_version = '2.1.0' 823 if compareVersions(protoc_version[1], min_protoc_version) < 0: 824 print termcap.Yellow + termcap.Bold + \ 825 'Warning: protoc version', min_protoc_version, \ 826 'or newer required.\n' + \ 827 ' Installed version:', protoc_version[1], \ 828 termcap.Normal 829 main['PROTOC'] = False 830 else: 831 # Attempt to determine the appropriate include path and 832 # library path using pkg-config, that means we also need to 833 # check for pkg-config. Note that it is possible to use 834 # protobuf without the involvement of pkg-config. Later on we 835 # check go a library config check and at that point the test 836 # will fail if libprotobuf cannot be found. 837 if readCommand(['pkg-config', '--version'], exception=''): 838 try: 839 # Attempt to establish what linking flags to add for protobuf 840 # using pkg-config 841 main.ParseConfig('pkg-config --cflags --libs-only-L protobuf') 842 except: 843 print termcap.Yellow + termcap.Bold + \ 844 'Warning: pkg-config could not get protobuf flags.' + \ 845 termcap.Normal 846 847# Check for SWIG 848if not main.has_key('SWIG'): 849 print 'Error: SWIG utility not found.' 850 print ' Please install (see http://www.swig.org) and retry.' 851 Exit(1) 852 853# Check for appropriate SWIG version 854swig_version = readCommand([main['SWIG'], '-version'], exception='').split() 855# First 3 words should be "SWIG Version x.y.z" 856if len(swig_version) < 3 or \ 857 swig_version[0] != 'SWIG' or swig_version[1] != 'Version': 858 print 'Error determining SWIG version.' 859 Exit(1) 860 861min_swig_version = '2.0.4' 862if compareVersions(swig_version[2], min_swig_version) < 0: 863 print 'Error: SWIG version', min_swig_version, 'or newer required.' 864 print ' Installed version:', swig_version[2] 865 Exit(1) 866 867# Check for known incompatibilities. The standard library shipped with 868# gcc >= 4.9 does not play well with swig versions prior to 3.0 869if main['GCC'] and compareVersions(gcc_version, '4.9') >= 0 and \ 870 compareVersions(swig_version[2], '3.0') < 0: 871 print termcap.Yellow + termcap.Bold + \ 872 'Warning: This combination of gcc and swig have' + \ 873 ' known incompatibilities.\n' + \ 874 ' If you encounter build problems, please update ' + \ 875 'swig to 3.0 or later.' + \ 876 termcap.Normal 877 878# Set up SWIG flags & scanner 879swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS') 880main.Append(SWIGFLAGS=swig_flags) 881 882# Check for 'timeout' from GNU coreutils. If present, regressions will 883# be run with a time limit. We require version 8.13 since we rely on 884# support for the '--foreground' option. 885timeout_lines = readCommand(['timeout', '--version'], 886 exception='').splitlines() 887# Get the first line and tokenize it 888timeout_version = timeout_lines[0].split() if timeout_lines else [] 889main['TIMEOUT'] = timeout_version and \ 890 compareVersions(timeout_version[-1], '8.13') >= 0 891 892# filter out all existing swig scanners, they mess up the dependency 893# stuff for some reason 894scanners = [] 895for scanner in main['SCANNERS']: 896 skeys = scanner.skeys 897 if skeys == '.i': 898 continue 899 900 if isinstance(skeys, (list, tuple)) and '.i' in skeys: 901 continue 902 903 scanners.append(scanner) 904 905# add the new swig scanner that we like better 906from SCons.Scanner import ClassicCPP as CPPScanner 907swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")' 908scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re)) 909 910# replace the scanners list that has what we want 911main['SCANNERS'] = scanners 912 913# Add a custom Check function to test for structure members. 914def CheckMember(context, include, decl, member, include_quotes="<>"): 915 context.Message("Checking for member %s in %s..." % 916 (member, decl)) 917 text = """ 918#include %(header)s 919int main(){ 920 %(decl)s test; 921 (void)test.%(member)s; 922 return 0; 923}; 924""" % { "header" : include_quotes[0] + include + include_quotes[1], 925 "decl" : decl, 926 "member" : member, 927 } 928 929 ret = context.TryCompile(text, extension=".cc") 930 context.Result(ret) 931 return ret 932 933# Platform-specific configuration. Note again that we assume that all 934# builds under a given build root run on the same host platform. 935conf = Configure(main, 936 conf_dir = joinpath(build_root, '.scons_config'), 937 log_file = joinpath(build_root, 'scons_config.log'), 938 custom_tests = { 939 'CheckMember' : CheckMember, 940 }) 941 942# Check if we should compile a 64 bit binary on Mac OS X/Darwin 943try: 944 import platform 945 uname = platform.uname() 946 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 947 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 948 main.Append(CCFLAGS=['-arch', 'x86_64']) 949 main.Append(CFLAGS=['-arch', 'x86_64']) 950 main.Append(LINKFLAGS=['-arch', 'x86_64']) 951 main.Append(ASFLAGS=['-arch', 'x86_64']) 952except: 953 pass 954 955# Recent versions of scons substitute a "Null" object for Configure() 956# when configuration isn't necessary, e.g., if the "--help" option is 957# present. Unfortuantely this Null object always returns false, 958# breaking all our configuration checks. We replace it with our own 959# more optimistic null object that returns True instead. 960if not conf: 961 def NullCheck(*args, **kwargs): 962 return True 963 964 class NullConf: 965 def __init__(self, env): 966 self.env = env 967 def Finish(self): 968 return self.env 969 def __getattr__(self, mname): 970 return NullCheck 971 972 conf = NullConf(main) 973 974# Cache build files in the supplied directory. 975if main['M5_BUILD_CACHE']: 976 print 'Using build cache located at', main['M5_BUILD_CACHE'] 977 CacheDir(main['M5_BUILD_CACHE']) 978 979if not GetOption('without_python'): 980 # Find Python include and library directories for embedding the 981 # interpreter. We rely on python-config to resolve the appropriate 982 # includes and linker flags. ParseConfig does not seem to understand 983 # the more exotic linker flags such as -Xlinker and -export-dynamic so 984 # we add them explicitly below. If you want to link in an alternate 985 # version of python, see above for instructions on how to invoke 986 # scons with the appropriate PATH set. 987 # 988 # First we check if python2-config exists, else we use python-config 989 python_config = readCommand(['which', 'python2-config'], 990 exception='').strip() 991 if not os.path.exists(python_config): 992 python_config = readCommand(['which', 'python-config'], 993 exception='').strip() 994 py_includes = readCommand([python_config, '--includes'], 995 exception='').split() 996 # Strip the -I from the include folders before adding them to the 997 # CPPPATH 998 main.Append(CPPPATH=map(lambda inc: inc[2:], py_includes)) 999 1000 # Read the linker flags and split them into libraries and other link 1001 # flags. The libraries are added later through the call the CheckLib. 1002 py_ld_flags = readCommand([python_config, '--ldflags'], 1003 exception='').split() 1004 py_libs = [] 1005 for lib in py_ld_flags: 1006 if not lib.startswith('-l'): 1007 main.Append(LINKFLAGS=[lib]) 1008 else: 1009 lib = lib[2:] 1010 if lib not in py_libs: 1011 py_libs.append(lib) 1012 1013 # verify that this stuff works 1014 if not conf.CheckHeader('Python.h', '<>'): 1015 print "Error: can't find Python.h header in", py_includes 1016 print "Install Python headers (package python-dev on Ubuntu and RedHat)" 1017 Exit(1) 1018 1019 for lib in py_libs: 1020 if not conf.CheckLib(lib): 1021 print "Error: can't find library %s required by python" % lib 1022 Exit(1) 1023 1024# On Solaris you need to use libsocket for socket ops 1025if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 1026 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 1027 print "Can't find library with socket calls (e.g. accept())" 1028 Exit(1) 1029 1030# Check for zlib. If the check passes, libz will be automatically 1031# added to the LIBS environment variable. 1032if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 1033 print 'Error: did not find needed zlib compression library '\ 1034 'and/or zlib.h header file.' 1035 print ' Please install zlib and try again.' 1036 Exit(1) 1037 1038# If we have the protobuf compiler, also make sure we have the 1039# development libraries. If the check passes, libprotobuf will be 1040# automatically added to the LIBS environment variable. After 1041# this, we can use the HAVE_PROTOBUF flag to determine if we have 1042# got both protoc and libprotobuf available. 1043main['HAVE_PROTOBUF'] = main['PROTOC'] and \ 1044 conf.CheckLibWithHeader('protobuf', 'google/protobuf/message.h', 1045 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;') 1046 1047# If we have the compiler but not the library, print another warning. 1048if main['PROTOC'] and not main['HAVE_PROTOBUF']: 1049 print termcap.Yellow + termcap.Bold + \ 1050 'Warning: did not find protocol buffer library and/or headers.\n' + \ 1051 ' Please install libprotobuf-dev for tracing support.' + \ 1052 termcap.Normal 1053 1054# Check for librt. 1055have_posix_clock = \ 1056 conf.CheckLibWithHeader(None, 'time.h', 'C', 1057 'clock_nanosleep(0,0,NULL,NULL);') or \ 1058 conf.CheckLibWithHeader('rt', 'time.h', 'C', 1059 'clock_nanosleep(0,0,NULL,NULL);') 1060 1061have_posix_timers = \ 1062 conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C', 1063 'timer_create(CLOCK_MONOTONIC, NULL, NULL);') 1064 1065if not GetOption('without_tcmalloc'): 1066 if conf.CheckLib('tcmalloc'): 1067 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 1068 elif conf.CheckLib('tcmalloc_minimal'): 1069 main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS']) 1070 else: 1071 print termcap.Yellow + termcap.Bold + \ 1072 "You can get a 12% performance improvement by "\ 1073 "installing tcmalloc (libgoogle-perftools-dev package "\ 1074 "on Ubuntu or RedHat)." + termcap.Normal 1075 1076 1077# Detect back trace implementations. The last implementation in the 1078# list will be used by default. 1079backtrace_impls = [ "none" ] 1080 1081if conf.CheckLibWithHeader(None, 'execinfo.h', 'C', 1082 'backtrace_symbols_fd((void*)0, 0, 0);'): 1083 backtrace_impls.append("glibc") 1084 1085if backtrace_impls[-1] == "none": 1086 default_backtrace_impl = "none" 1087 print termcap.Yellow + termcap.Bold + \ 1088 "No suitable back trace implementation found." + \ 1089 termcap.Normal 1090 1091if not have_posix_clock: 1092 print "Can't find library for POSIX clocks." 1093 1094# Check for <fenv.h> (C99 FP environment control) 1095have_fenv = conf.CheckHeader('fenv.h', '<>') 1096if not have_fenv: 1097 print "Warning: Header file <fenv.h> not found." 1098 print " This host has no IEEE FP rounding mode control." 1099 1100# Check if we should enable KVM-based hardware virtualization. The API 1101# we rely on exists since version 2.6.36 of the kernel, but somehow 1102# the KVM_API_VERSION does not reflect the change. We test for one of 1103# the types as a fall back. 1104have_kvm = conf.CheckHeader('linux/kvm.h', '<>') 1105if not have_kvm: 1106 print "Info: Compatible header file <linux/kvm.h> not found, " \ 1107 "disabling KVM support." 1108 1109# x86 needs support for xsave. We test for the structure here since we 1110# won't be able to run new tests by the time we know which ISA we're 1111# targeting. 1112have_kvm_xsave = conf.CheckTypeSize('struct kvm_xsave', 1113 '#include <linux/kvm.h>') != 0 1114 1115# Check if the requested target ISA is compatible with the host 1116def is_isa_kvm_compatible(isa): 1117 try: 1118 import platform 1119 host_isa = platform.machine() 1120 except: 1121 print "Warning: Failed to determine host ISA." 1122 return False 1123 1124 if not have_posix_timers: 1125 print "Warning: Can not enable KVM, host seems to lack support " \ 1126 "for POSIX timers" 1127 return False 1128 1129 if isa == "arm": 1130 return host_isa in ( "armv7l", "aarch64" ) 1131 elif isa == "x86": 1132 if host_isa != "x86_64": 1133 return False 1134 1135 if not have_kvm_xsave: 1136 print "KVM on x86 requires xsave support in kernel headers." 1137 return False 1138 1139 return True 1140 else: 1141 return False 1142 1143 1144# Check if the exclude_host attribute is available. We want this to 1145# get accurate instruction counts in KVM. 1146main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember( 1147 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host') 1148 1149 1150###################################################################### 1151# 1152# Finish the configuration 1153# 1154main = conf.Finish() 1155 1156###################################################################### 1157# 1158# Collect all non-global variables 1159# 1160 1161# Define the universe of supported ISAs 1162all_isa_list = [ ] 1163all_gpu_isa_list = [ ] 1164Export('all_isa_list') 1165Export('all_gpu_isa_list') 1166 1167class CpuModel(object): 1168 '''The CpuModel class encapsulates everything the ISA parser needs to 1169 know about a particular CPU model.''' 1170 1171 # Dict of available CPU model objects. Accessible as CpuModel.dict. 1172 dict = {} 1173 1174 # Constructor. Automatically adds models to CpuModel.dict. 1175 def __init__(self, name, default=False): 1176 self.name = name # name of model 1177 1178 # This cpu is enabled by default 1179 self.default = default 1180 1181 # Add self to dict 1182 if name in CpuModel.dict: 1183 raise AttributeError, "CpuModel '%s' already registered" % name 1184 CpuModel.dict[name] = self 1185 1186Export('CpuModel') 1187 1188# Sticky variables get saved in the variables file so they persist from 1189# one invocation to the next (unless overridden, in which case the new 1190# value becomes sticky). 1191sticky_vars = Variables(args=ARGUMENTS) 1192Export('sticky_vars') 1193 1194# Sticky variables that should be exported 1195export_vars = [] 1196Export('export_vars') 1197 1198# For Ruby 1199all_protocols = [] 1200Export('all_protocols') 1201protocol_dirs = [] 1202Export('protocol_dirs') 1203slicc_includes = [] 1204Export('slicc_includes') 1205 1206# Walk the tree and execute all SConsopts scripts that wil add to the 1207# above variables 1208if GetOption('verbose'): 1209 print "Reading SConsopts" 1210for bdir in [ base_dir ] + extras_dir_list: 1211 if not isdir(bdir): 1212 print "Error: directory '%s' does not exist" % bdir 1213 Exit(1) 1214 for root, dirs, files in os.walk(bdir): 1215 if 'SConsopts' in files: 1216 if GetOption('verbose'): 1217 print "Reading", joinpath(root, 'SConsopts') 1218 SConscript(joinpath(root, 'SConsopts')) 1219 1220all_isa_list.sort() 1221all_gpu_isa_list.sort() 1222 1223sticky_vars.AddVariables( 1224 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 1225 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'hsail', all_gpu_isa_list), 1226 ListVariable('CPU_MODELS', 'CPU models', 1227 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 1228 sorted(CpuModel.dict.keys())), 1229 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 1230 False), 1231 BoolVariable('SS_COMPATIBLE_FP', 1232 'Make floating-point results compatible with SimpleScalar', 1233 False), 1234 BoolVariable('USE_SSE2', 1235 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 1236 False), 1237 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 1238 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 1239 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False), 1240 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm), 1241 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False), 1242 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None', 1243 all_protocols), 1244 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation', 1245 backtrace_impls[-1], backtrace_impls) 1246 ) 1247 1248# These variables get exported to #defines in config/*.hh (see src/SConscript). 1249export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'TARGET_GPU_ISA', 1250 'CP_ANNOTATE', 'USE_POSIX_CLOCK', 'USE_KVM', 'PROTOCOL', 1251 'HAVE_PROTOBUF', 'HAVE_PERF_ATTR_EXCLUDE_HOST'] 1252 1253################################################### 1254# 1255# Define a SCons builder for configuration flag headers. 1256# 1257################################################### 1258 1259# This function generates a config header file that #defines the 1260# variable symbol to the current variable setting (0 or 1). The source 1261# operands are the name of the variable and a Value node containing the 1262# value of the variable. 1263def build_config_file(target, source, env): 1264 (variable, value) = [s.get_contents() for s in source] 1265 f = file(str(target[0]), 'w') 1266 print >> f, '#define', variable, value 1267 f.close() 1268 return None 1269 1270# Combine the two functions into a scons Action object. 1271config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 1272 1273# The emitter munges the source & target node lists to reflect what 1274# we're really doing. 1275def config_emitter(target, source, env): 1276 # extract variable name from Builder arg 1277 variable = str(target[0]) 1278 # True target is config header file 1279 target = joinpath('config', variable.lower() + '.hh') 1280 val = env[variable] 1281 if isinstance(val, bool): 1282 # Force value to 0/1 1283 val = int(val) 1284 elif isinstance(val, str): 1285 val = '"' + val + '"' 1286 1287 # Sources are variable name & value (packaged in SCons Value nodes) 1288 return ([target], [Value(variable), Value(val)]) 1289 1290config_builder = Builder(emitter = config_emitter, action = config_action) 1291 1292main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 1293 1294# libelf build is shared across all configs in the build root. 1295main.SConscript('ext/libelf/SConscript', 1296 variant_dir = joinpath(build_root, 'libelf')) 1297 1298# iostream3 build is shared across all configs in the build root. 1299main.SConscript('ext/iostream3/SConscript', 1300 variant_dir = joinpath(build_root, 'iostream3')) 1301 1302# libfdt build is shared across all configs in the build root. 1303main.SConscript('ext/libfdt/SConscript', 1304 variant_dir = joinpath(build_root, 'libfdt')) 1305 1306# fputils build is shared across all configs in the build root. 1307main.SConscript('ext/fputils/SConscript', 1308 variant_dir = joinpath(build_root, 'fputils')) 1309 1310# DRAMSim2 build is shared across all configs in the build root. 1311main.SConscript('ext/dramsim2/SConscript', 1312 variant_dir = joinpath(build_root, 'dramsim2')) 1313 1314# DRAMPower build is shared across all configs in the build root. 1315main.SConscript('ext/drampower/SConscript', 1316 variant_dir = joinpath(build_root, 'drampower')) 1317 1318# nomali build is shared across all configs in the build root. 1319main.SConscript('ext/nomali/SConscript', 1320 variant_dir = joinpath(build_root, 'nomali')) 1321 1322################################################### 1323# 1324# This function is used to set up a directory with switching headers 1325# 1326################################################### 1327 1328main['ALL_ISA_LIST'] = all_isa_list 1329main['ALL_GPU_ISA_LIST'] = all_gpu_isa_list 1330all_isa_deps = {} 1331def make_switching_dir(dname, switch_headers, env): 1332 # Generate the header. target[0] is the full path of the output 1333 # header to generate. 'source' is a dummy variable, since we get the 1334 # list of ISAs from env['ALL_ISA_LIST']. 1335 def gen_switch_hdr(target, source, env): 1336 fname = str(target[0]) 1337 isa = env['TARGET_ISA'].lower() 1338 try: 1339 f = open(fname, 'w') 1340 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname)) 1341 f.close() 1342 except IOError: 1343 print "Failed to create %s" % fname 1344 raise 1345 1346 # Build SCons Action object. 'varlist' specifies env vars that this 1347 # action depends on; when env['ALL_ISA_LIST'] changes these actions 1348 # should get re-executed. 1349 switch_hdr_action = MakeAction(gen_switch_hdr, 1350 Transform("GENERATE"), varlist=['ALL_ISA_LIST']) 1351 1352 # Instantiate actions for each header 1353 for hdr in switch_headers: 1354 env.Command(hdr, [], switch_hdr_action) 1355 1356 isa_target = Dir('.').up().name.lower().replace('_', '-') 1357 env['PHONY_BASE'] = '#'+isa_target 1358 all_isa_deps[isa_target] = None 1359 1360Export('make_switching_dir') 1361 1362def make_gpu_switching_dir(dname, switch_headers, env): 1363 # Generate the header. target[0] is the full path of the output 1364 # header to generate. 'source' is a dummy variable, since we get the 1365 # list of ISAs from env['ALL_ISA_LIST']. 1366 def gen_switch_hdr(target, source, env): 1367 fname = str(target[0]) 1368 1369 isa = env['TARGET_GPU_ISA'].lower() 1370 1371 try: 1372 f = open(fname, 'w') 1373 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname)) 1374 f.close() 1375 except IOError: 1376 print "Failed to create %s" % fname 1377 raise 1378 1379 # Build SCons Action object. 'varlist' specifies env vars that this 1380 # action depends on; when env['ALL_ISA_LIST'] changes these actions 1381 # should get re-executed. 1382 switch_hdr_action = MakeAction(gen_switch_hdr, 1383 Transform("GENERATE"), varlist=['ALL_ISA_GPU_LIST']) 1384 1385 # Instantiate actions for each header 1386 for hdr in switch_headers: 1387 env.Command(hdr, [], switch_hdr_action) 1388 1389Export('make_gpu_switching_dir') 1390 1391# all-isas -> all-deps -> all-environs -> all_targets 1392main.Alias('#all-isas', []) 1393main.Alias('#all-deps', '#all-isas') 1394 1395# Dummy target to ensure all environments are created before telling 1396# SCons what to actually make (the command line arguments). We attach 1397# them to the dependence graph after the environments are complete. 1398ORIG_BUILD_TARGETS = list(BUILD_TARGETS) # force a copy; gets closure to work. 1399def environsComplete(target, source, env): 1400 for t in ORIG_BUILD_TARGETS: 1401 main.Depends('#all-targets', t) 1402 1403# Each build/* switching_dir attaches its *-environs target to #all-environs. 1404main.Append(BUILDERS = {'CompleteEnvirons' : 1405 Builder(action=MakeAction(environsComplete, None))}) 1406main.CompleteEnvirons('#all-environs', []) 1407 1408def doNothing(**ignored): pass 1409main.Append(BUILDERS = {'Dummy': Builder(action=MakeAction(doNothing, None))}) 1410 1411# The final target to which all the original targets ultimately get attached. 1412main.Dummy('#all-targets', '#all-environs') 1413BUILD_TARGETS[:] = ['#all-targets'] 1414 1415################################################### 1416# 1417# Define build environments for selected configurations. 1418# 1419################################################### 1420 1421for variant_path in variant_paths: 1422 if not GetOption('silent'): 1423 print "Building in", variant_path 1424 1425 # Make a copy of the build-root environment to use for this config. 1426 env = main.Clone() 1427 env['BUILDDIR'] = variant_path 1428 1429 # variant_dir is the tail component of build path, and is used to 1430 # determine the build parameters (e.g., 'ALPHA_SE') 1431 (build_root, variant_dir) = splitpath(variant_path) 1432 1433 # Set env variables according to the build directory config. 1434 sticky_vars.files = [] 1435 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 1436 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 1437 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 1438 current_vars_file = joinpath(build_root, 'variables', variant_dir) 1439 if isfile(current_vars_file): 1440 sticky_vars.files.append(current_vars_file) 1441 if not GetOption('silent'): 1442 print "Using saved variables file %s" % current_vars_file 1443 else: 1444 # Build dir-specific variables file doesn't exist. 1445 1446 # Make sure the directory is there so we can create it later 1447 opt_dir = dirname(current_vars_file) 1448 if not isdir(opt_dir): 1449 mkdir(opt_dir) 1450 1451 # Get default build variables from source tree. Variables are 1452 # normally determined by name of $VARIANT_DIR, but can be 1453 # overridden by '--default=' arg on command line. 1454 default = GetOption('default') 1455 opts_dir = joinpath(main.root.abspath, 'build_opts') 1456 if default: 1457 default_vars_files = [joinpath(build_root, 'variables', default), 1458 joinpath(opts_dir, default)] 1459 else: 1460 default_vars_files = [joinpath(opts_dir, variant_dir)] 1461 existing_files = filter(isfile, default_vars_files) 1462 if existing_files: 1463 default_vars_file = existing_files[0] 1464 sticky_vars.files.append(default_vars_file) 1465 print "Variables file %s not found,\n using defaults in %s" \ 1466 % (current_vars_file, default_vars_file) 1467 else: 1468 print "Error: cannot find variables file %s or " \ 1469 "default file(s) %s" \ 1470 % (current_vars_file, ' or '.join(default_vars_files)) 1471 Exit(1) 1472 1473 # Apply current variable settings to env 1474 sticky_vars.Update(env) 1475 1476 help_texts["local_vars"] += \ 1477 "Build variables for %s:\n" % variant_dir \ 1478 + sticky_vars.GenerateHelpText(env) 1479 1480 # Process variable settings. 1481 1482 if not have_fenv and env['USE_FENV']: 1483 print "Warning: <fenv.h> not available; " \ 1484 "forcing USE_FENV to False in", variant_dir + "." 1485 env['USE_FENV'] = False 1486 1487 if not env['USE_FENV']: 1488 print "Warning: No IEEE FP rounding mode control in", variant_dir + "." 1489 print " FP results may deviate slightly from other platforms." 1490 1491 if env['EFENCE']: 1492 env.Append(LIBS=['efence']) 1493 1494 if env['USE_KVM']: 1495 if not have_kvm: 1496 print "Warning: Can not enable KVM, host seems to lack KVM support" 1497 env['USE_KVM'] = False 1498 elif not is_isa_kvm_compatible(env['TARGET_ISA']): 1499 print "Info: KVM support disabled due to unsupported host and " \ 1500 "target ISA combination" 1501 env['USE_KVM'] = False 1502 1503 # Warn about missing optional functionality 1504 if env['USE_KVM']: 1505 if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']: 1506 print "Warning: perf_event headers lack support for the " \ 1507 "exclude_host attribute. KVM instruction counts will " \ 1508 "be inaccurate." 1509 1510 # Save sticky variable settings back to current variables file 1511 sticky_vars.Save(current_vars_file, env) 1512 1513 if env['USE_SSE2']: 1514 env.Append(CCFLAGS=['-msse2']) 1515 1516 # The src/SConscript file sets up the build rules in 'env' according 1517 # to the configured variables. It returns a list of environments, 1518 # one for each variant build (debug, opt, etc.) 1519 SConscript('src/SConscript', variant_dir = variant_path, exports = 'env') 1520 1521def pairwise(iterable): 1522 "s -> (s0,s1), (s1,s2), (s2, s3), ..." 1523 a, b = itertools.tee(iterable) 1524 b.next() 1525 return itertools.izip(a, b) 1526 1527# Create false dependencies so SCons will parse ISAs, establish 1528# dependencies, and setup the build Environments serially. Either 1529# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j 1530# greater than 1. It appears to be standard race condition stuff; it 1531# doesn't always fail, but usually, and the behaviors are different. 1532# Every time I tried to remove this, builds would fail in some 1533# creative new way. So, don't do that. You'll want to, though, because 1534# tests/SConscript takes a long time to make its Environments. 1535for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())): 1536 main.Depends('#%s-deps' % t2, '#%s-deps' % t1) 1537 main.Depends('#%s-environs' % t2, '#%s-environs' % t1) 1538 1539# base help text 1540Help(''' 1541Usage: scons [scons options] [build variables] [target(s)] 1542 1543Extra scons options: 1544%(options)s 1545 1546Global build variables: 1547%(global_vars)s 1548 1549%(local_vars)s 1550''' % help_texts) 1551