SConstruct revision 8897:1021e1f313d0
1# -*- mode:python -*- 2 3# Copyright (c) 2011 Advanced Micro Devices, Inc. 4# Copyright (c) 2009 The Hewlett-Packard Development Company 5# Copyright (c) 2004-2005 The Regents of The University of Michigan 6# All rights reserved. 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions are 10# met: redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer; 12# redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution; 15# neither the name of the copyright holders nor the names of its 16# contributors may be used to endorse or promote products derived from 17# this software without specific prior written permission. 18# 19# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30# 31# Authors: Steve Reinhardt 32# Nathan Binkert 33 34################################################### 35# 36# SCons top-level build description (SConstruct) file. 37# 38# While in this directory ('gem5'), just type 'scons' to build the default 39# configuration (see below), or type 'scons build/<CONFIG>/<binary>' 40# to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for 41# the optimized full-system version). 42# 43# You can build gem5 in a different directory as long as there is a 44# 'build/<CONFIG>' somewhere along the target path. The build system 45# expects that all configs under the same build directory are being 46# built for the same host system. 47# 48# Examples: 49# 50# The following two commands are equivalent. The '-u' option tells 51# scons to search up the directory tree for this SConstruct file. 52# % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug 53# % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug 54# 55# The following two commands are equivalent and demonstrate building 56# in a directory outside of the source tree. The '-C' option tells 57# scons to chdir to the specified directory to find this SConstruct 58# file. 59# % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug 60# % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug 61# 62# You can use 'scons -H' to print scons options. If you're in this 63# 'gem5' directory (or use -u or -C to tell scons where to find this 64# file), you can use 'scons -h' to print all the gem5-specific build 65# options as well. 66# 67################################################### 68 69# Check for recent-enough Python and SCons versions. 70try: 71 # Really old versions of scons only take two options for the 72 # function, so check once without the revision and once with the 73 # revision, the first instance will fail for stuff other than 74 # 0.98, and the second will fail for 0.98.0 75 EnsureSConsVersion(0, 98) 76 EnsureSConsVersion(0, 98, 1) 77except SystemExit, e: 78 print """ 79For more details, see: 80 http://gem5.org/Dependencies 81""" 82 raise 83 84# We ensure the python version early because we have stuff that 85# requires python 2.4 86try: 87 EnsurePythonVersion(2, 4) 88except SystemExit, e: 89 print """ 90You can use a non-default installation of the Python interpreter by 91either (1) rearranging your PATH so that scons finds the non-default 92'python' first or (2) explicitly invoking an alternative interpreter 93on the scons script. 94 95For more details, see: 96 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation 97""" 98 raise 99 100# Global Python includes 101import os 102import re 103import subprocess 104import sys 105 106from os import mkdir, environ 107from os.path import abspath, basename, dirname, expanduser, normpath 108from os.path import exists, isdir, isfile 109from os.path import join as joinpath, split as splitpath 110 111# SCons includes 112import SCons 113import SCons.Node 114 115extra_python_paths = [ 116 Dir('src/python').srcnode().abspath, # gem5 includes 117 Dir('ext/ply').srcnode().abspath, # ply is used by several files 118 ] 119 120sys.path[1:1] = extra_python_paths 121 122from m5.util import compareVersions, readCommand 123 124help_texts = { 125 "options" : "", 126 "global_vars" : "", 127 "local_vars" : "" 128} 129 130Export("help_texts") 131 132 133# There's a bug in scons in that (1) by default, the help texts from 134# AddOption() are supposed to be displayed when you type 'scons -h' 135# and (2) you can override the help displayed by 'scons -h' using the 136# Help() function, but these two features are incompatible: once 137# you've overridden the help text using Help(), there's no way to get 138# at the help texts from AddOptions. See: 139# http://scons.tigris.org/issues/show_bug.cgi?id=2356 140# http://scons.tigris.org/issues/show_bug.cgi?id=2611 141# This hack lets us extract the help text from AddOptions and 142# re-inject it via Help(). Ideally someday this bug will be fixed and 143# we can just use AddOption directly. 144def AddLocalOption(*args, **kwargs): 145 col_width = 30 146 147 help = " " + ", ".join(args) 148 if "help" in kwargs: 149 length = len(help) 150 if length >= col_width: 151 help += "\n" + " " * col_width 152 else: 153 help += " " * (col_width - length) 154 help += kwargs["help"] 155 help_texts["options"] += help + "\n" 156 157 AddOption(*args, **kwargs) 158 159AddLocalOption('--colors', dest='use_colors', action='store_true', 160 help="Add color to abbreviated scons output") 161AddLocalOption('--no-colors', dest='use_colors', action='store_false', 162 help="Don't add color to abbreviated scons output") 163AddLocalOption('--default', dest='default', type='string', action='store', 164 help='Override which build_opts file to use for defaults') 165AddLocalOption('--ignore-style', dest='ignore_style', action='store_true', 166 help='Disable style checking hooks') 167AddLocalOption('--update-ref', dest='update_ref', action='store_true', 168 help='Update test reference outputs') 169AddLocalOption('--verbose', dest='verbose', action='store_true', 170 help='Print full tool command lines') 171 172use_colors = GetOption('use_colors') 173if use_colors: 174 from m5.util.terminal import termcap 175elif use_colors is None: 176 # option unspecified; default behavior is to use colors iff isatty 177 from m5.util.terminal import tty_termcap as termcap 178else: 179 from m5.util.terminal import no_termcap as termcap 180 181######################################################################## 182# 183# Set up the main build environment. 184# 185######################################################################## 186use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH', 'PATH', 187 'PYTHONPATH', 'RANLIB' ]) 188 189use_env = {} 190for key,val in os.environ.iteritems(): 191 if key in use_vars or key.startswith("M5"): 192 use_env[key] = val 193 194main = Environment(ENV=use_env) 195main.Decider('MD5-timestamp') 196main.root = Dir(".") # The current directory (where this file lives). 197main.srcdir = Dir("src") # The source directory 198 199# add useful python code PYTHONPATH so it can be used by subprocesses 200# as well 201main.AppendENVPath('PYTHONPATH', extra_python_paths) 202 203######################################################################## 204# 205# Mercurial Stuff. 206# 207# If the gem5 directory is a mercurial repository, we should do some 208# extra things. 209# 210######################################################################## 211 212hgdir = main.root.Dir(".hg") 213 214mercurial_style_message = """ 215You're missing the gem5 style hook, which automatically checks your code 216against the gem5 style rules on hg commit and qrefresh commands. This 217script will now install the hook in your .hg/hgrc file. 218Press enter to continue, or ctrl-c to abort: """ 219 220mercurial_style_hook = """ 221# The following lines were automatically added by gem5/SConstruct 222# to provide the gem5 style-checking hooks 223[extensions] 224style = %s/util/style.py 225 226[hooks] 227pretxncommit.style = python:style.check_style 228pre-qrefresh.style = python:style.check_style 229# End of SConstruct additions 230 231""" % (main.root.abspath) 232 233mercurial_lib_not_found = """ 234Mercurial libraries cannot be found, ignoring style hook. If 235you are a gem5 developer, please fix this and run the style 236hook. It is important. 237""" 238 239# Check for style hook and prompt for installation if it's not there. 240# Skip this if --ignore-style was specified, there's no .hg dir to 241# install a hook in, or there's no interactive terminal to prompt. 242if not GetOption('ignore_style') and hgdir.exists() and sys.stdin.isatty(): 243 style_hook = True 244 try: 245 from mercurial import ui 246 ui = ui.ui() 247 ui.readconfig(hgdir.File('hgrc').abspath) 248 style_hook = ui.config('hooks', 'pretxncommit.style', None) and \ 249 ui.config('hooks', 'pre-qrefresh.style', None) 250 except ImportError: 251 print mercurial_lib_not_found 252 253 if not style_hook: 254 print mercurial_style_message, 255 # continue unless user does ctrl-c/ctrl-d etc. 256 try: 257 raw_input() 258 except: 259 print "Input exception, exiting scons.\n" 260 sys.exit(1) 261 hgrc_path = '%s/.hg/hgrc' % main.root.abspath 262 print "Adding style hook to", hgrc_path, "\n" 263 try: 264 hgrc = open(hgrc_path, 'a') 265 hgrc.write(mercurial_style_hook) 266 hgrc.close() 267 except: 268 print "Error updating", hgrc_path 269 sys.exit(1) 270 271 272################################################### 273# 274# Figure out which configurations to set up based on the path(s) of 275# the target(s). 276# 277################################################### 278 279# Find default configuration & binary. 280Default(environ.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug')) 281 282# helper function: find last occurrence of element in list 283def rfind(l, elt, offs = -1): 284 for i in range(len(l)+offs, 0, -1): 285 if l[i] == elt: 286 return i 287 raise ValueError, "element not found" 288 289# Take a list of paths (or SCons Nodes) and return a list with all 290# paths made absolute and ~-expanded. Paths will be interpreted 291# relative to the launch directory unless a different root is provided 292def makePathListAbsolute(path_list, root=GetLaunchDir()): 293 return [abspath(joinpath(root, expanduser(str(p)))) 294 for p in path_list] 295 296# Each target must have 'build' in the interior of the path; the 297# directory below this will determine the build parameters. For 298# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we 299# recognize that ALPHA_SE specifies the configuration because it 300# follow 'build' in the build path. 301 302# The funky assignment to "[:]" is needed to replace the list contents 303# in place rather than reassign the symbol to a new list, which 304# doesn't work (obviously!). 305BUILD_TARGETS[:] = makePathListAbsolute(BUILD_TARGETS) 306 307# Generate a list of the unique build roots and configs that the 308# collected targets reference. 309variant_paths = [] 310build_root = None 311for t in BUILD_TARGETS: 312 path_dirs = t.split('/') 313 try: 314 build_top = rfind(path_dirs, 'build', -2) 315 except: 316 print "Error: no non-leaf 'build' dir found on target path", t 317 Exit(1) 318 this_build_root = joinpath('/',*path_dirs[:build_top+1]) 319 if not build_root: 320 build_root = this_build_root 321 else: 322 if this_build_root != build_root: 323 print "Error: build targets not under same build root\n"\ 324 " %s\n %s" % (build_root, this_build_root) 325 Exit(1) 326 variant_path = joinpath('/',*path_dirs[:build_top+2]) 327 if variant_path not in variant_paths: 328 variant_paths.append(variant_path) 329 330# Make sure build_root exists (might not if this is the first build there) 331if not isdir(build_root): 332 mkdir(build_root) 333main['BUILDROOT'] = build_root 334 335Export('main') 336 337main.SConsignFile(joinpath(build_root, "sconsign")) 338 339# Default duplicate option is to use hard links, but this messes up 340# when you use emacs to edit a file in the target dir, as emacs moves 341# file to file~ then copies to file, breaking the link. Symbolic 342# (soft) links work better. 343main.SetOption('duplicate', 'soft-copy') 344 345# 346# Set up global sticky variables... these are common to an entire build 347# tree (not specific to a particular build like ALPHA_SE) 348# 349 350global_vars_file = joinpath(build_root, 'variables.global') 351 352global_vars = Variables(global_vars_file, args=ARGUMENTS) 353 354global_vars.AddVariables( 355 ('CC', 'C compiler', environ.get('CC', main['CC'])), 356 ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])), 357 ('BATCH', 'Use batch pool for build and tests', False), 358 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'), 359 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False), 360 ('EXTRAS', 'Add extra directories to the compilation', '') 361 ) 362 363# Update main environment with values from ARGUMENTS & global_vars_file 364global_vars.Update(main) 365help_texts["global_vars"] += global_vars.GenerateHelpText(main) 366 367# Save sticky variable settings back to current variables file 368global_vars.Save(global_vars_file, main) 369 370# Parse EXTRAS variable to build list of all directories where we're 371# look for sources etc. This list is exported as extras_dir_list. 372base_dir = main.srcdir.abspath 373if main['EXTRAS']: 374 extras_dir_list = makePathListAbsolute(main['EXTRAS'].split(':')) 375else: 376 extras_dir_list = [] 377 378Export('base_dir') 379Export('extras_dir_list') 380 381# the ext directory should be on the #includes path 382main.Append(CPPPATH=[Dir('ext')]) 383 384def strip_build_path(path, env): 385 path = str(path) 386 variant_base = env['BUILDROOT'] + os.path.sep 387 if path.startswith(variant_base): 388 path = path[len(variant_base):] 389 elif path.startswith('build/'): 390 path = path[6:] 391 return path 392 393# Generate a string of the form: 394# common/path/prefix/src1, src2 -> tgt1, tgt2 395# to print while building. 396class Transform(object): 397 # all specific color settings should be here and nowhere else 398 tool_color = termcap.Normal 399 pfx_color = termcap.Yellow 400 srcs_color = termcap.Yellow + termcap.Bold 401 arrow_color = termcap.Blue + termcap.Bold 402 tgts_color = termcap.Yellow + termcap.Bold 403 404 def __init__(self, tool, max_sources=99): 405 self.format = self.tool_color + (" [%8s] " % tool) \ 406 + self.pfx_color + "%s" \ 407 + self.srcs_color + "%s" \ 408 + self.arrow_color + " -> " \ 409 + self.tgts_color + "%s" \ 410 + termcap.Normal 411 self.max_sources = max_sources 412 413 def __call__(self, target, source, env, for_signature=None): 414 # truncate source list according to max_sources param 415 source = source[0:self.max_sources] 416 def strip(f): 417 return strip_build_path(str(f), env) 418 if len(source) > 0: 419 srcs = map(strip, source) 420 else: 421 srcs = [''] 422 tgts = map(strip, target) 423 # surprisingly, os.path.commonprefix is a dumb char-by-char string 424 # operation that has nothing to do with paths. 425 com_pfx = os.path.commonprefix(srcs + tgts) 426 com_pfx_len = len(com_pfx) 427 if com_pfx: 428 # do some cleanup and sanity checking on common prefix 429 if com_pfx[-1] == ".": 430 # prefix matches all but file extension: ok 431 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o' 432 com_pfx = com_pfx[0:-1] 433 elif com_pfx[-1] == "/": 434 # common prefix is directory path: OK 435 pass 436 else: 437 src0_len = len(srcs[0]) 438 tgt0_len = len(tgts[0]) 439 if src0_len == com_pfx_len: 440 # source is a substring of target, OK 441 pass 442 elif tgt0_len == com_pfx_len: 443 # target is a substring of source, need to back up to 444 # avoid empty string on RHS of arrow 445 sep_idx = com_pfx.rfind(".") 446 if sep_idx != -1: 447 com_pfx = com_pfx[0:sep_idx] 448 else: 449 com_pfx = '' 450 elif src0_len > com_pfx_len and srcs[0][com_pfx_len] == ".": 451 # still splitting at file extension: ok 452 pass 453 else: 454 # probably a fluke; ignore it 455 com_pfx = '' 456 # recalculate length in case com_pfx was modified 457 com_pfx_len = len(com_pfx) 458 def fmt(files): 459 f = map(lambda s: s[com_pfx_len:], files) 460 return ', '.join(f) 461 return self.format % (com_pfx, fmt(srcs), fmt(tgts)) 462 463Export('Transform') 464 465 466if GetOption('verbose'): 467 def MakeAction(action, string, *args, **kwargs): 468 return Action(action, *args, **kwargs) 469else: 470 MakeAction = Action 471 main['CCCOMSTR'] = Transform("CC") 472 main['CXXCOMSTR'] = Transform("CXX") 473 main['ASCOMSTR'] = Transform("AS") 474 main['SWIGCOMSTR'] = Transform("SWIG") 475 main['ARCOMSTR'] = Transform("AR", 0) 476 main['LINKCOMSTR'] = Transform("LINK", 0) 477 main['RANLIBCOMSTR'] = Transform("RANLIB", 0) 478 main['M4COMSTR'] = Transform("M4") 479 main['SHCCCOMSTR'] = Transform("SHCC") 480 main['SHCXXCOMSTR'] = Transform("SHCXX") 481Export('MakeAction') 482 483CXX_version = readCommand([main['CXX'],'--version'], exception=False) 484CXX_V = readCommand([main['CXX'],'-V'], exception=False) 485 486main['GCC'] = CXX_version and CXX_version.find('g++') >= 0 487main['SUNCC'] = CXX_V and CXX_V.find('Sun C++') >= 0 488main['ICC'] = CXX_V and CXX_V.find('Intel') >= 0 489main['CLANG'] = CXX_V and CXX_V.find('clang') >= 0 490if main['GCC'] + main['SUNCC'] + main['ICC'] + main['CLANG'] > 1: 491 print 'Error: How can we have two at the same time?' 492 Exit(1) 493 494# Set up default C++ compiler flags 495if main['GCC']: 496 main.Append(CCFLAGS=['-pipe']) 497 main.Append(CCFLAGS=['-fno-strict-aliasing']) 498 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef']) 499 main.Append(CXXFLAGS=['-Wno-deprecated']) 500 # Read the GCC version to check for versions with bugs 501 # Note CCVERSION doesn't work here because it is run with the CC 502 # before we override it from the command line 503 gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False) 504 main['GCC_VERSION'] = gcc_version 505 if not compareVersions(gcc_version, '4.4.1') or \ 506 not compareVersions(gcc_version, '4.4.2'): 507 print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.' 508 main.Append(CCFLAGS=['-fno-tree-vectorize']) 509elif main['ICC']: 510 pass #Fix me... add warning flags once we clean up icc warnings 511elif main['SUNCC']: 512 main.Append(CCFLAGS=['-Qoption ccfe']) 513 main.Append(CCFLAGS=['-features=gcc']) 514 main.Append(CCFLAGS=['-features=extensions']) 515 main.Append(CCFLAGS=['-library=stlport4']) 516 main.Append(CCFLAGS=['-xar']) 517 #main.Append(CCFLAGS=['-instances=semiexplicit']) 518elif main['CLANG']: 519 clang_version_re = re.compile(".* version (\d+\.\d+)") 520 clang_version_match = clang_version_re.match(CXX_version) 521 if (clang_version_match): 522 clang_version = clang_version_match.groups()[0] 523 if compareVersions(clang_version, "2.9") < 0: 524 print 'Error: clang version 2.9 or newer required.' 525 print ' Installed version:', clang_version 526 Exit(1) 527 else: 528 print 'Error: Unable to determine clang version.' 529 Exit(1) 530 531 main.Append(CCFLAGS=['-pipe']) 532 main.Append(CCFLAGS=['-fno-strict-aliasing']) 533 main.Append(CCFLAGS=['-Wall', '-Wno-sign-compare', '-Wundef']) 534 main.Append(CCFLAGS=['-Wno-tautological-compare']) 535 main.Append(CCFLAGS=['-Wno-self-assign']) 536else: 537 print 'Error: Don\'t know what compiler options to use for your compiler.' 538 print ' Please fix SConstruct and src/SConscript and try again.' 539 Exit(1) 540 541# Set up common yacc/bison flags (needed for Ruby) 542main['YACCFLAGS'] = '-d' 543main['YACCHXXFILESUFFIX'] = '.hh' 544 545# Do this after we save setting back, or else we'll tack on an 546# extra 'qdo' every time we run scons. 547if main['BATCH']: 548 main['CC'] = main['BATCH_CMD'] + ' ' + main['CC'] 549 main['CXX'] = main['BATCH_CMD'] + ' ' + main['CXX'] 550 main['AS'] = main['BATCH_CMD'] + ' ' + main['AS'] 551 main['AR'] = main['BATCH_CMD'] + ' ' + main['AR'] 552 main['RANLIB'] = main['BATCH_CMD'] + ' ' + main['RANLIB'] 553 554if sys.platform == 'cygwin': 555 # cygwin has some header file issues... 556 main.Append(CCFLAGS=["-Wno-uninitialized"]) 557 558# Check for SWIG 559if not main.has_key('SWIG'): 560 print 'Error: SWIG utility not found.' 561 print ' Please install (see http://www.swig.org) and retry.' 562 Exit(1) 563 564# Check for appropriate SWIG version 565swig_version = readCommand(('swig', '-version'), exception='').split() 566# First 3 words should be "SWIG Version x.y.z" 567if len(swig_version) < 3 or \ 568 swig_version[0] != 'SWIG' or swig_version[1] != 'Version': 569 print 'Error determining SWIG version.' 570 Exit(1) 571 572min_swig_version = '1.3.28' 573if compareVersions(swig_version[2], min_swig_version) < 0: 574 print 'Error: SWIG version', min_swig_version, 'or newer required.' 575 print ' Installed version:', swig_version[2] 576 Exit(1) 577 578# Set up SWIG flags & scanner 579swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS') 580main.Append(SWIGFLAGS=swig_flags) 581 582# filter out all existing swig scanners, they mess up the dependency 583# stuff for some reason 584scanners = [] 585for scanner in main['SCANNERS']: 586 skeys = scanner.skeys 587 if skeys == '.i': 588 continue 589 590 if isinstance(skeys, (list, tuple)) and '.i' in skeys: 591 continue 592 593 scanners.append(scanner) 594 595# add the new swig scanner that we like better 596from SCons.Scanner import ClassicCPP as CPPScanner 597swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")' 598scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re)) 599 600# replace the scanners list that has what we want 601main['SCANNERS'] = scanners 602 603# Add a custom Check function to the Configure context so that we can 604# figure out if the compiler adds leading underscores to global 605# variables. This is needed for the autogenerated asm files that we 606# use for embedding the python code. 607def CheckLeading(context): 608 context.Message("Checking for leading underscore in global variables...") 609 # 1) Define a global variable called x from asm so the C compiler 610 # won't change the symbol at all. 611 # 2) Declare that variable. 612 # 3) Use the variable 613 # 614 # If the compiler prepends an underscore, this will successfully 615 # link because the external symbol 'x' will be called '_x' which 616 # was defined by the asm statement. If the compiler does not 617 # prepend an underscore, this will not successfully link because 618 # '_x' will have been defined by assembly, while the C portion of 619 # the code will be trying to use 'x' 620 ret = context.TryLink(''' 621 asm(".globl _x; _x: .byte 0"); 622 extern int x; 623 int main() { return x; } 624 ''', extension=".c") 625 context.env.Append(LEADING_UNDERSCORE=ret) 626 context.Result(ret) 627 return ret 628 629# Platform-specific configuration. Note again that we assume that all 630# builds under a given build root run on the same host platform. 631conf = Configure(main, 632 conf_dir = joinpath(build_root, '.scons_config'), 633 log_file = joinpath(build_root, 'scons_config.log'), 634 custom_tests = { 'CheckLeading' : CheckLeading }) 635 636# Check for leading underscores. Don't really need to worry either 637# way so don't need to check the return code. 638conf.CheckLeading() 639 640# Check if we should compile a 64 bit binary on Mac OS X/Darwin 641try: 642 import platform 643 uname = platform.uname() 644 if uname[0] == 'Darwin' and compareVersions(uname[2], '9.0.0') >= 0: 645 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]): 646 main.Append(CCFLAGS=['-arch', 'x86_64']) 647 main.Append(CFLAGS=['-arch', 'x86_64']) 648 main.Append(LINKFLAGS=['-arch', 'x86_64']) 649 main.Append(ASFLAGS=['-arch', 'x86_64']) 650except: 651 pass 652 653# Recent versions of scons substitute a "Null" object for Configure() 654# when configuration isn't necessary, e.g., if the "--help" option is 655# present. Unfortuantely this Null object always returns false, 656# breaking all our configuration checks. We replace it with our own 657# more optimistic null object that returns True instead. 658if not conf: 659 def NullCheck(*args, **kwargs): 660 return True 661 662 class NullConf: 663 def __init__(self, env): 664 self.env = env 665 def Finish(self): 666 return self.env 667 def __getattr__(self, mname): 668 return NullCheck 669 670 conf = NullConf(main) 671 672# Find Python include and library directories for embedding the 673# interpreter. For consistency, we will use the same Python 674# installation used to run scons (and thus this script). If you want 675# to link in an alternate version, see above for instructions on how 676# to invoke scons with a different copy of the Python interpreter. 677from distutils import sysconfig 678 679py_getvar = sysconfig.get_config_var 680 681py_debug = getattr(sys, 'pydebug', False) 682py_version = 'python' + py_getvar('VERSION') + (py_debug and "_d" or "") 683 684py_general_include = sysconfig.get_python_inc() 685py_platform_include = sysconfig.get_python_inc(plat_specific=True) 686py_includes = [ py_general_include ] 687if py_platform_include != py_general_include: 688 py_includes.append(py_platform_include) 689 690py_lib_path = [ py_getvar('LIBDIR') ] 691# add the prefix/lib/pythonX.Y/config dir, but only if there is no 692# shared library in prefix/lib/. 693if not py_getvar('Py_ENABLE_SHARED'): 694 py_lib_path.append(py_getvar('LIBPL')) 695 696py_libs = [] 697for lib in py_getvar('LIBS').split() + py_getvar('SYSLIBS').split(): 698 if not lib.startswith('-l'): 699 # Python requires some special flags to link (e.g. -framework 700 # common on OS X systems), assume appending preserves order 701 main.Append(LINKFLAGS=[lib]) 702 else: 703 lib = lib[2:] 704 if lib not in py_libs: 705 py_libs.append(lib) 706py_libs.append(py_version) 707 708main.Append(CPPPATH=py_includes) 709main.Append(LIBPATH=py_lib_path) 710 711# Cache build files in the supplied directory. 712if main['M5_BUILD_CACHE']: 713 print 'Using build cache located at', main['M5_BUILD_CACHE'] 714 CacheDir(main['M5_BUILD_CACHE']) 715 716 717# verify that this stuff works 718if not conf.CheckHeader('Python.h', '<>'): 719 print "Error: can't find Python.h header in", py_includes 720 Exit(1) 721 722for lib in py_libs: 723 if not conf.CheckLib(lib): 724 print "Error: can't find library %s required by python" % lib 725 Exit(1) 726 727# On Solaris you need to use libsocket for socket ops 728if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'): 729 if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'): 730 print "Can't find library with socket calls (e.g. accept())" 731 Exit(1) 732 733# Check for zlib. If the check passes, libz will be automatically 734# added to the LIBS environment variable. 735if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'): 736 print 'Error: did not find needed zlib compression library '\ 737 'and/or zlib.h header file.' 738 print ' Please install zlib and try again.' 739 Exit(1) 740 741# Check for librt. 742have_posix_clock = \ 743 conf.CheckLibWithHeader(None, 'time.h', 'C', 744 'clock_nanosleep(0,0,NULL,NULL);') or \ 745 conf.CheckLibWithHeader('rt', 'time.h', 'C', 746 'clock_nanosleep(0,0,NULL,NULL);') 747 748if not have_posix_clock: 749 print "Can't find library for POSIX clocks." 750 751# Check for <fenv.h> (C99 FP environment control) 752have_fenv = conf.CheckHeader('fenv.h', '<>') 753if not have_fenv: 754 print "Warning: Header file <fenv.h> not found." 755 print " This host has no IEEE FP rounding mode control." 756 757###################################################################### 758# 759# Finish the configuration 760# 761main = conf.Finish() 762 763###################################################################### 764# 765# Collect all non-global variables 766# 767 768# Define the universe of supported ISAs 769all_isa_list = [ ] 770Export('all_isa_list') 771 772class CpuModel(object): 773 '''The CpuModel class encapsulates everything the ISA parser needs to 774 know about a particular CPU model.''' 775 776 # Dict of available CPU model objects. Accessible as CpuModel.dict. 777 dict = {} 778 list = [] 779 defaults = [] 780 781 # Constructor. Automatically adds models to CpuModel.dict. 782 def __init__(self, name, filename, includes, strings, default=False): 783 self.name = name # name of model 784 self.filename = filename # filename for output exec code 785 self.includes = includes # include files needed in exec file 786 # The 'strings' dict holds all the per-CPU symbols we can 787 # substitute into templates etc. 788 self.strings = strings 789 790 # This cpu is enabled by default 791 self.default = default 792 793 # Add self to dict 794 if name in CpuModel.dict: 795 raise AttributeError, "CpuModel '%s' already registered" % name 796 CpuModel.dict[name] = self 797 CpuModel.list.append(name) 798 799Export('CpuModel') 800 801# Sticky variables get saved in the variables file so they persist from 802# one invocation to the next (unless overridden, in which case the new 803# value becomes sticky). 804sticky_vars = Variables(args=ARGUMENTS) 805Export('sticky_vars') 806 807# Sticky variables that should be exported 808export_vars = [] 809Export('export_vars') 810 811# Walk the tree and execute all SConsopts scripts that wil add to the 812# above variables 813if not GetOption('verbose'): 814 print "Reading SConsopts" 815for bdir in [ base_dir ] + extras_dir_list: 816 if not isdir(bdir): 817 print "Error: directory '%s' does not exist" % bdir 818 Exit(1) 819 for root, dirs, files in os.walk(bdir): 820 if 'SConsopts' in files: 821 if GetOption('verbose'): 822 print "Reading", joinpath(root, 'SConsopts') 823 SConscript(joinpath(root, 'SConsopts')) 824 825all_isa_list.sort() 826 827sticky_vars.AddVariables( 828 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list), 829 ListVariable('CPU_MODELS', 'CPU models', 830 sorted(n for n,m in CpuModel.dict.iteritems() if m.default), 831 sorted(CpuModel.list)), 832 BoolVariable('NO_FAST_ALLOC', 'Disable fast object allocator', False), 833 BoolVariable('FORCE_FAST_ALLOC', 834 'Enable fast object allocator, even for gem5.debug', False), 835 BoolVariable('FAST_ALLOC_STATS', 'Enable fast object allocator statistics', 836 False), 837 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger', 838 False), 839 BoolVariable('SS_COMPATIBLE_FP', 840 'Make floating-point results compatible with SimpleScalar', 841 False), 842 BoolVariable('USE_SSE2', 843 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts', 844 False), 845 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock), 846 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv), 847 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False), 848 ) 849 850# These variables get exported to #defines in config/*.hh (see src/SConscript). 851export_vars += ['USE_FENV', 'NO_FAST_ALLOC', 'FORCE_FAST_ALLOC', 852 'FAST_ALLOC_STATS', 'SS_COMPATIBLE_FP', 853 'TARGET_ISA', 'CP_ANNOTATE', 'USE_POSIX_CLOCK' ] 854 855################################################### 856# 857# Define a SCons builder for configuration flag headers. 858# 859################################################### 860 861# This function generates a config header file that #defines the 862# variable symbol to the current variable setting (0 or 1). The source 863# operands are the name of the variable and a Value node containing the 864# value of the variable. 865def build_config_file(target, source, env): 866 (variable, value) = [s.get_contents() for s in source] 867 f = file(str(target[0]), 'w') 868 print >> f, '#define', variable, value 869 f.close() 870 return None 871 872# Combine the two functions into a scons Action object. 873config_action = MakeAction(build_config_file, Transform("CONFIG H", 2)) 874 875# The emitter munges the source & target node lists to reflect what 876# we're really doing. 877def config_emitter(target, source, env): 878 # extract variable name from Builder arg 879 variable = str(target[0]) 880 # True target is config header file 881 target = joinpath('config', variable.lower() + '.hh') 882 val = env[variable] 883 if isinstance(val, bool): 884 # Force value to 0/1 885 val = int(val) 886 elif isinstance(val, str): 887 val = '"' + val + '"' 888 889 # Sources are variable name & value (packaged in SCons Value nodes) 890 return ([target], [Value(variable), Value(val)]) 891 892config_builder = Builder(emitter = config_emitter, action = config_action) 893 894main.Append(BUILDERS = { 'ConfigFile' : config_builder }) 895 896# libelf build is shared across all configs in the build root. 897main.SConscript('ext/libelf/SConscript', 898 variant_dir = joinpath(build_root, 'libelf')) 899 900# gzstream build is shared across all configs in the build root. 901main.SConscript('ext/gzstream/SConscript', 902 variant_dir = joinpath(build_root, 'gzstream')) 903 904################################################### 905# 906# This function is used to set up a directory with switching headers 907# 908################################################### 909 910main['ALL_ISA_LIST'] = all_isa_list 911def make_switching_dir(dname, switch_headers, env): 912 # Generate the header. target[0] is the full path of the output 913 # header to generate. 'source' is a dummy variable, since we get the 914 # list of ISAs from env['ALL_ISA_LIST']. 915 def gen_switch_hdr(target, source, env): 916 fname = str(target[0]) 917 f = open(fname, 'w') 918 isa = env['TARGET_ISA'].lower() 919 print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname)) 920 f.close() 921 922 # Build SCons Action object. 'varlist' specifies env vars that this 923 # action depends on; when env['ALL_ISA_LIST'] changes these actions 924 # should get re-executed. 925 switch_hdr_action = MakeAction(gen_switch_hdr, 926 Transform("GENERATE"), varlist=['ALL_ISA_LIST']) 927 928 # Instantiate actions for each header 929 for hdr in switch_headers: 930 env.Command(hdr, [], switch_hdr_action) 931Export('make_switching_dir') 932 933################################################### 934# 935# Define build environments for selected configurations. 936# 937################################################### 938 939for variant_path in variant_paths: 940 print "Building in", variant_path 941 942 # Make a copy of the build-root environment to use for this config. 943 env = main.Clone() 944 env['BUILDDIR'] = variant_path 945 946 # variant_dir is the tail component of build path, and is used to 947 # determine the build parameters (e.g., 'ALPHA_SE') 948 (build_root, variant_dir) = splitpath(variant_path) 949 950 # Set env variables according to the build directory config. 951 sticky_vars.files = [] 952 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in 953 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke 954 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings. 955 current_vars_file = joinpath(build_root, 'variables', variant_dir) 956 if isfile(current_vars_file): 957 sticky_vars.files.append(current_vars_file) 958 print "Using saved variables file %s" % current_vars_file 959 else: 960 # Build dir-specific variables file doesn't exist. 961 962 # Make sure the directory is there so we can create it later 963 opt_dir = dirname(current_vars_file) 964 if not isdir(opt_dir): 965 mkdir(opt_dir) 966 967 # Get default build variables from source tree. Variables are 968 # normally determined by name of $VARIANT_DIR, but can be 969 # overridden by '--default=' arg on command line. 970 default = GetOption('default') 971 opts_dir = joinpath(main.root.abspath, 'build_opts') 972 if default: 973 default_vars_files = [joinpath(build_root, 'variables', default), 974 joinpath(opts_dir, default)] 975 else: 976 default_vars_files = [joinpath(opts_dir, variant_dir)] 977 existing_files = filter(isfile, default_vars_files) 978 if existing_files: 979 default_vars_file = existing_files[0] 980 sticky_vars.files.append(default_vars_file) 981 print "Variables file %s not found,\n using defaults in %s" \ 982 % (current_vars_file, default_vars_file) 983 else: 984 print "Error: cannot find variables file %s or " \ 985 "default file(s) %s" \ 986 % (current_vars_file, ' or '.join(default_vars_files)) 987 Exit(1) 988 989 # Apply current variable settings to env 990 sticky_vars.Update(env) 991 992 help_texts["local_vars"] += \ 993 "Build variables for %s:\n" % variant_dir \ 994 + sticky_vars.GenerateHelpText(env) 995 996 # Process variable settings. 997 998 if not have_fenv and env['USE_FENV']: 999 print "Warning: <fenv.h> not available; " \ 1000 "forcing USE_FENV to False in", variant_dir + "." 1001 env['USE_FENV'] = False 1002 1003 if not env['USE_FENV']: 1004 print "Warning: No IEEE FP rounding mode control in", variant_dir + "." 1005 print " FP results may deviate slightly from other platforms." 1006 1007 if env['EFENCE']: 1008 env.Append(LIBS=['efence']) 1009 1010 # Save sticky variable settings back to current variables file 1011 sticky_vars.Save(current_vars_file, env) 1012 1013 if env['USE_SSE2']: 1014 env.Append(CCFLAGS=['-msse2']) 1015 1016 # The src/SConscript file sets up the build rules in 'env' according 1017 # to the configured variables. It returns a list of environments, 1018 # one for each variant build (debug, opt, etc.) 1019 envList = SConscript('src/SConscript', variant_dir = variant_path, 1020 exports = 'env') 1021 1022 # Set up the regression tests for each build. 1023 for e in envList: 1024 SConscript('tests/SConscript', 1025 variant_dir = joinpath(variant_path, 'tests', e.Label), 1026 exports = { 'env' : e }, duplicate = False) 1027 1028# base help text 1029Help(''' 1030Usage: scons [scons options] [build variables] [target(s)] 1031 1032Extra scons options: 1033%(options)s 1034 1035Global build variables: 1036%(global_vars)s 1037 1038%(local_vars)s 1039''' % help_texts) 1040