SConstruct

   1 # -*- mode:python -*-
   2
   3 # Copyright (c) 2004-2005 The Regents of The University of Michigan
   4 # All rights reserved.
   5 #
   6 # Redistribution and use in source and binary forms, with or without
   7 # modification, are permitted provided that the following conditions are
   8 # met: redistributions of source code must retain the above copyright
   9 # notice, this list of conditions and the following disclaimer;
  10 # redistributions in binary form must reproduce the above copyright
  11 # notice, this list of conditions and the following disclaimer in the
  12 # documentation and/or other materials provided with the distribution;
  13 # neither the name of the copyright holders nor the names of its
  14 # contributors may be used to endorse or promote products derived from
  15 # this software without specific prior written permission.
  16 #
  17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 #
  29 # Authors: Steve Reinhardt
  30
  31 ###################################################
  32 #
  33 # SCons top-level build description (SConstruct) file.
  34 #
  35 # While in this directory ('m5'), just type 'scons' to build the default
  36 # configuration (see below), or type 'scons build/<CONFIG>/<binary>'
  37 # to build some other configuration (e.g., 'build/ALPHA_FS/m5.opt' for
  38 # the optimized full-system version).
  39 #
  40 # You can build M5 in a different directory as long as there is a
  41 # 'build/<CONFIG>' somewhere along the target path.  The build system
  42 # expects that all configs under the same build directory are being
  43 # built for the same host system.
  44 #
  45 # Examples:
  46 #
  47 #   The following two commands are equivalent.  The '-u' option tells
  48 #   scons to search up the directory tree for this SConstruct file.
  49 #   % cd <path-to-src>/m5 ; scons build/ALPHA_FS/m5.debug
  50 #   % cd <path-to-src>/m5/build/ALPHA_FS; scons -u m5.debug
  51 #
  52 #   The following two commands are equivalent and demonstrate building
  53 #   in a directory outside of the source tree.  The '-C' option tells
  54 #   scons to chdir to the specified directory to find this SConstruct
  55 #   file.
  56 #   % cd <path-to-src>/m5 ; scons /local/foo/build/ALPHA_FS/m5.debug
  57 #   % cd /local/foo/build/ALPHA_FS; scons -C <path-to-src>/m5 m5.debug
  58 #
  59 # You can use 'scons -H' to print scons options.  If you're in this
  60 # 'm5' directory (or use -u or -C to tell scons where to find this
  61 # file), you can use 'scons -h' to print all the M5-specific build
  62 # options as well.
  63 #
  64 ###################################################
  65
  66 import sys
  67 import os
  68 import re
  69
  70 from os.path import isdir, isfile, join as joinpath
  71
  72 import SCons
  73
  74 # Check for recent-enough Python and SCons versions.  If your system's
  75 # default installation of Python is not recent enough, you can use a
  76 # non-default installation of the Python interpreter by either (1)
  77 # rearranging your PATH so that scons finds the non-default 'python'
  78 # first or (2) explicitly invoking an alternative interpreter on the
  79 # scons script, e.g., "/usr/local/bin/python2.4 `which scons` [args]".
  80 EnsurePythonVersion(2,4)
  81
  82 # Import subprocess after we check the version since it doesn't exist in
  83 # Python < 2.4.
  84 import subprocess
  85
  86 # helper function: compare arrays or strings of version numbers.
  87 # E.g., compare_version((1,3,25), (1,4,1)')
  88 # returns -1, 0, 1 if v1 is <, ==, > v2
  89 def compare_versions(v1, v2):
  90     def make_version_list(v):
  91         if isinstance(v, (list,tuple)):
  92             return v
  93         elif isinstance(v, str):
  94             return map(lambda x: int(re.match('\d+', x).group()), v.split('.'))
  95         else:
  96             raise TypeError
  97
  98     v1 = make_version_list(v1)
  99     v2 = make_version_list(v2)
 100     # Compare corresponding elements of lists
 101     for n1,n2 in zip(v1, v2):
 102         if n1 < n2: return -1
 103         if n1 > n2: return  1
 104     # all corresponding values are equal... see if one has extra values
 105     if len(v1) < len(v2): return -1
 106     if len(v1) > len(v2): return  1
 107     return 0
 108
 109 # SCons version numbers need special processing because they can have
 110 # charecters and an release date embedded in them. This function does
 111 # the magic to extract them in a similar way to the SCons internal function
 112 # function does and then checks that the current version is not contained in
 113 # a list of version tuples (bad_ver_strs)
 114 def CheckSCons(bad_ver_strs):
 115     def scons_ver(v):
 116         num_parts = v.split(' ')[0].split('.')
 117         major = int(num_parts[0])
 118         minor = int(re.match('\d+', num_parts[1]).group())
 119         rev = 0
 120         rdate = 0
 121         if len(num_parts) > 2:
 122             try: rev = int(re.match('\d+', num_parts[2]).group())
 123             except: pass
 124             rev_parts = num_parts[2].split('d')
 125             if len(rev_parts) > 1:
 126                 rdate = int(re.match('\d+', rev_parts[1]).group())
 127
 128         return (major, minor, rev, rdate)
 129
 130     sc_ver = scons_ver(SCons.__version__)
 131     for bad_ver in bad_ver_strs:
 132         bv = (scons_ver(bad_ver[0]), scons_ver(bad_ver[1]))
 133         if  compare_versions(sc_ver, bv[0]) != -1 and\
 134             compare_versions(sc_ver, bv[1]) != 1:
 135             print "The version of SCons that you have installed: ", SCons.__version__
 136             print "has a bug that prevents it from working correctly with M5."
 137             print "Please install a version NOT contained within the following",
 138             print "ranges (inclusive):"
 139             for bad_ver in bad_ver_strs:
 140                 print "    %s - %s" % bad_ver
 141             Exit(2)
 142
 143 CheckSCons((
 144     # We need a version that is 0.96.91 or newer
 145     ('0.0.0', '0.96.90'),
 146     ))
 147
 148
 149 # The absolute path to the current directory (where this file lives).
 150 ROOT = Dir('.').abspath
 151
 152 # Path to the M5 source tree.
 153 SRCDIR = joinpath(ROOT, 'src')
 154
 155 # tell python where to find m5 python code
 156 sys.path.append(joinpath(ROOT, 'src/python'))
 157
 158 def check_style_hook(ui):
 159     ui.readconfig(joinpath(ROOT, '.hg', 'hgrc'))
 160     style_hook = ui.config('hooks', 'pretxncommit.style', None)
 161
 162     if not style_hook:
 163         print """\
 164 You're missing the M5 style hook.
 165 Please install the hook so we can ensure that all code fits a common style.
 166
 167 All you'd need to do is add the following lines to your repository .hg/hgrc
 168 or your personal .hgrc
 169 ----------------
 170
 171 [extensions]
 172 style = %s/util/style.py
 173
 174 [hooks]
 175 pretxncommit.style = python:style.check_whitespace
 176 """ % (ROOT)
 177         sys.exit(1)
 178
 179 if ARGUMENTS.get('IGNORE_STYLE') != 'True' and isdir(joinpath(ROOT, '.hg')):
 180     try:
 181         from mercurial import ui
 182         check_style_hook(ui.ui())
 183     except ImportError:
 184         pass
 185
 186 ###################################################
 187 #
 188 # Figure out which configurations to set up based on the path(s) of
 189 # the target(s).
 190 #
 191 ###################################################
 192
 193 # Find default configuration & binary.
 194 Default(os.environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
 195
 196 # helper function: find last occurrence of element in list
 197 def rfind(l, elt, offs = -1):
 198     for i in range(len(l)+offs, 0, -1):
 199         if l[i] == elt:
 200             return i
 201     raise ValueError, "element not found"
 202
 203 # Each target must have 'build' in the interior of the path; the
 204 # directory below this will determine the build parameters.  For
 205 # example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
 206 # recognize that ALPHA_SE specifies the configuration because it
 207 # follow 'build' in the bulid path.
 208
 209 # Generate absolute paths to targets so we can see where the build dir is
 210 if COMMAND_LINE_TARGETS:
 211     # Ask SCons which directory it was invoked from
 212     launch_dir = GetLaunchDir()
 213     # Make targets relative to invocation directory
 214     abs_targets = map(lambda x: os.path.normpath(joinpath(launch_dir, str(x))),
 215                       COMMAND_LINE_TARGETS)
 216 else:
 217     # Default targets are relative to root of tree
 218     abs_targets = map(lambda x: os.path.normpath(joinpath(ROOT, str(x))),
 219                       DEFAULT_TARGETS)
 220
 221
 222 # Generate a list of the unique build roots and configs that the
 223 # collected targets reference.
 224 build_paths = []
 225 build_root = None
 226 for t in abs_targets:
 227     path_dirs = t.split('/')
 228     try:
 229         build_top = rfind(path_dirs, 'build', -2)
 230     except:
 231         print "Error: no non-leaf 'build' dir found on target path", t
 232         Exit(1)
 233     this_build_root = joinpath('/',*path_dirs[:build_top+1])
 234     if not build_root:
 235         build_root = this_build_root
 236     else:
 237         if this_build_root != build_root:
 238             print "Error: build targets not under same build root\n"\
 239                   "  %s\n  %s" % (build_root, this_build_root)
 240             Exit(1)
 241     build_path = joinpath('/',*path_dirs[:build_top+2])
 242     if build_path not in build_paths:
 243         build_paths.append(build_path)
 244
 245 # Make sure build_root exists (might not if this is the first build there)
 246 if not isdir(build_root):
 247     os.mkdir(build_root)
 248
 249 ###################################################
 250 #
 251 # Set up the default build environment.  This environment is copied
 252 # and modified according to each selected configuration.
 253 #
 254 ###################################################
 255
 256 env = Environment(ENV = os.environ,  # inherit user's environment vars
 257                   ROOT = ROOT,
 258                   SRCDIR = SRCDIR)
 259
 260 Export('env')
 261
 262 env.SConsignFile(joinpath(build_root,"sconsign"))
 263
 264 # Default duplicate option is to use hard links, but this messes up
 265 # when you use emacs to edit a file in the target dir, as emacs moves
 266 # file to file~ then copies to file, breaking the link.  Symbolic
 267 # (soft) links work better.
 268 env.SetOption('duplicate', 'soft-copy')
 269
 270 # I waffle on this setting... it does avoid a few painful but
 271 # unnecessary builds, but it also seems to make trivial builds take
 272 # noticeably longer.
 273 if False:
 274     env.TargetSignatures('content')
 275
 276 #
 277 # Set up global sticky options... these are common to an entire build
 278 # tree (not specific to a particular build like ALPHA_SE)
 279 #
 280
 281 # Option validators & converters for global sticky options
 282 def PathListMakeAbsolute(val):
 283     if not val:
 284         return val
 285     f = lambda p: os.path.abspath(os.path.expanduser(p))
 286     return ':'.join(map(f, val.split(':')))
 287
 288 def PathListAllExist(key, val, env):
 289     if not val:
 290         return
 291     paths = val.split(':')
 292     for path in paths:
 293         if not isdir(path):
 294             raise SCons.Errors.UserError("Path does not exist: '%s'" % path)
 295
 296 global_sticky_opts_file = joinpath(build_root, 'options.global')
 297
 298 global_sticky_opts = Options(global_sticky_opts_file, args=ARGUMENTS)
 299
 300 global_sticky_opts.AddOptions(
 301     ('CC', 'C compiler', os.environ.get('CC', env['CC'])),
 302     ('CXX', 'C++ compiler', os.environ.get('CXX', env['CXX'])),
 303     ('BATCH', 'Use batch pool for build and tests', False),
 304     ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
 305     ('EXTRAS', 'Add Extra directories to the compilation', '',
 306      PathListAllExist, PathListMakeAbsolute)
 307     )
 308
 309
 310 # base help text
 311 help_text = '''
 312 Usage: scons [scons options] [build options] [target(s)]
 313
 314 '''
 315
 316 help_text += "Global sticky options:\n" \
 317              + global_sticky_opts.GenerateHelpText(env)
 318
 319 # Update env with values from ARGUMENTS & file global_sticky_opts_file
 320 global_sticky_opts.Update(env)
 321
 322 # Save sticky option settings back to current options file
 323 global_sticky_opts.Save(global_sticky_opts_file, env)
 324
 325 # Parse EXTRAS option to build list of all directories where we're
 326 # look for sources etc.  This list is exported as base_dir_list.
 327 base_dir_list = [joinpath(ROOT, 'src')]
 328 if env['EXTRAS']:
 329     base_dir_list += env['EXTRAS'].split(':')
 330
 331 Export('base_dir_list')
 332
 333 # M5_PLY is used by isa_parser.py to find the PLY package.
 334 env.Append(ENV = { 'M5_PLY' : str(Dir('ext/ply')) })
 335 env['GCC'] = subprocess.Popen(env['CXX'] + ' --version', shell=True,
 336         stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
 337         close_fds=True).communicate()[0].find('g++') >= 0
 338 env['SUNCC'] = subprocess.Popen(env['CXX'] + ' -V', shell=True,
 339         stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
 340         close_fds=True).communicate()[0].find('Sun C++') >= 0
 341 env['ICC'] = subprocess.Popen(env['CXX'] + ' -V', shell=True,
 342         stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
 343         close_fds=True).communicate()[0].find('Intel') >= 0
 344 if env['GCC'] + env['SUNCC'] + env['ICC'] > 1:
 345     print 'Error: How can we have two at the same time?'
 346     Exit(1)
 347
 348
 349 # Set up default C++ compiler flags
 350 if env['GCC']:
 351     env.Append(CCFLAGS='-pipe')
 352     env.Append(CCFLAGS='-fno-strict-aliasing')
 353     env.Append(CCFLAGS=Split('-Wall -Wno-sign-compare -Werror -Wundef'))
 354     env.Append(CXXFLAGS='-Wno-deprecated')
 355 elif env['ICC']:
 356     pass #Fix me... add warning flags once we clean up icc warnings
 357 elif env['SUNCC']:
 358     env.Append(CCFLAGS='-Qoption ccfe')
 359     env.Append(CCFLAGS='-features=gcc')
 360     env.Append(CCFLAGS='-features=extensions')
 361     env.Append(CCFLAGS='-library=stlport4')
 362     env.Append(CCFLAGS='-xar')
 363 #    env.Append(CCFLAGS='-instances=semiexplicit')
 364 else:
 365     print 'Error: Don\'t know what compiler options to use for your compiler.'
 366     print '       Please fix SConstruct and src/SConscript and try again.'
 367     Exit(1)
 368
 369 # Do this after we save setting back, or else we'll tack on an
 370 # extra 'qdo' every time we run scons.
 371 if env['BATCH']:
 372     env['CC']  = env['BATCH_CMD'] + ' ' + env['CC']
 373     env['CXX'] = env['BATCH_CMD'] + ' ' + env['CXX']
 374
 375 if sys.platform == 'cygwin':
 376     # cygwin has some header file issues...
 377     env.Append(CCFLAGS=Split("-Wno-uninitialized"))
 378 env.Append(CPPPATH=[Dir('ext/dnet')])
 379
 380 # Check for SWIG
 381 if not env.has_key('SWIG'):
 382     print 'Error: SWIG utility not found.'
 383     print '       Please install (see http://www.swig.org) and retry.'
 384     Exit(1)
 385
 386 # Check for appropriate SWIG version
 387 swig_version = os.popen('swig -version').read().split()
 388 # First 3 words should be "SWIG Version x.y.z"
 389 if len(swig_version) < 3 or \
 390         swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
 391     print 'Error determining SWIG version.'
 392     Exit(1)
 393
 394 min_swig_version = '1.3.28'
 395 if compare_versions(swig_version[2], min_swig_version) < 0:
 396     print 'Error: SWIG version', min_swig_version, 'or newer required.'
 397     print '       Installed version:', swig_version[2]
 398     Exit(1)
 399
 400 # Set up SWIG flags & scanner
 401 swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
 402 env.Append(SWIGFLAGS=swig_flags)
 403
 404 # filter out all existing swig scanners, they mess up the dependency
 405 # stuff for some reason
 406 scanners = []
 407 for scanner in env['SCANNERS']:
 408     skeys = scanner.skeys
 409     if skeys == '.i':
 410         continue
 411
 412     if isinstance(skeys, (list, tuple)) and '.i' in skeys:
 413         continue
 414
 415     scanners.append(scanner)
 416
 417 # add the new swig scanner that we like better
 418 from SCons.Scanner import ClassicCPP as CPPScanner
 419 swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
 420 scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
 421
 422 # replace the scanners list that has what we want
 423 env['SCANNERS'] = scanners
 424
 425 # Add a custom Check function to the Configure context so that we can
 426 # figure out if the compiler adds leading underscores to global
 427 # variables.  This is needed for the autogenerated asm files that we
 428 # use for embedding the python code.
 429 def CheckLeading(context):
 430     context.Message("Checking for leading underscore in global variables...")
 431     # 1) Define a global variable called x from asm so the C compiler
 432     #    won't change the symbol at all.
 433     # 2) Declare that variable.
 434     # 3) Use the variable
 435     #
 436     # If the compiler prepends an underscore, this will successfully
 437     # link because the external symbol 'x' will be called '_x' which
 438     # was defined by the asm statement.  If the compiler does not
 439     # prepend an underscore, this will not successfully link because
 440     # '_x' will have been defined by assembly, while the C portion of
 441     # the code will be trying to use 'x'
 442     ret = context.TryLink('''
 443         asm(".globl _x; _x: .byte 0");
 444         extern int x;
 445         int main() { return x; }
 446         ''', extension=".c")
 447     context.env.Append(LEADING_UNDERSCORE=ret)
 448     context.Result(ret)
 449     return ret
 450
 451 # Platform-specific configuration.  Note again that we assume that all
 452 # builds under a given build root run on the same host platform.
 453 conf = Configure(env,
 454                  conf_dir = joinpath(build_root, '.scons_config'),
 455                  log_file = joinpath(build_root, 'scons_config.log'),
 456                  custom_tests = { 'CheckLeading' : CheckLeading })
 457
 458 # Check for leading underscores.  Don't really need to worry either
 459 # way so don't need to check the return code.
 460 conf.CheckLeading()
 461
 462 # Check if we should compile a 64 bit binary on Mac OS X/Darwin
 463 try:
 464     import platform
 465     uname = platform.uname()
 466     if uname[0] == 'Darwin' and compare_versions(uname[2], '9.0.0') >= 0:
 467         if int(subprocess.Popen('sysctl -n hw.cpu64bit_capable', shell=True,
 468                stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
 469                close_fds=True).communicate()[0][0]):
 470             env.Append(CCFLAGS='-arch x86_64')
 471             env.Append(CFLAGS='-arch x86_64')
 472             env.Append(LINKFLAGS='-arch x86_64')
 473             env.Append(ASFLAGS='-arch x86_64')
 474 except:
 475     pass
 476
 477 # Recent versions of scons substitute a "Null" object for Configure()
 478 # when configuration isn't necessary, e.g., if the "--help" option is
 479 # present.  Unfortuantely this Null object always returns false,
 480 # breaking all our configuration checks.  We replace it with our own
 481 # more optimistic null object that returns True instead.
 482 if not conf:
 483     def NullCheck(*args, **kwargs):
 484         return True
 485
 486     class NullConf:
 487         def __init__(self, env):
 488             self.env = env
 489         def Finish(self):
 490             return self.env
 491         def __getattr__(self, mname):
 492             return NullCheck
 493
 494     conf = NullConf(env)
 495
 496 # Find Python include and library directories for embedding the
 497 # interpreter.  For consistency, we will use the same Python
 498 # installation used to run scons (and thus this script).  If you want
 499 # to link in an alternate version, see above for instructions on how
 500 # to invoke scons with a different copy of the Python interpreter.
 501
 502 # Get brief Python version name (e.g., "python2.4") for locating
 503 # include & library files
 504 py_version_name = 'python' + sys.version[:3]
 505
 506 # include path, e.g. /usr/local/include/python2.4
 507 py_header_path = joinpath(sys.exec_prefix, 'include', py_version_name)
 508 env.Append(CPPPATH = py_header_path)
 509 # verify that it works
 510 if not conf.CheckHeader('Python.h', '<>'):
 511     print "Error: can't find Python.h header in", py_header_path
 512     Exit(1)
 513
 514 # add library path too if it's not in the default place
 515 py_lib_path = None
 516 if sys.exec_prefix != '/usr':
 517     py_lib_path = joinpath(sys.exec_prefix, 'lib')
 518 elif sys.platform == 'cygwin':
 519     # cygwin puts the .dll in /bin for some reason
 520     py_lib_path = '/bin'
 521 if py_lib_path:
 522     env.Append(LIBPATH = py_lib_path)
 523     print 'Adding', py_lib_path, 'to LIBPATH for', py_version_name
 524 if not conf.CheckLib(py_version_name):
 525     print "Error: can't find Python library", py_version_name
 526     Exit(1)
 527
 528 # On Solaris you need to use libsocket for socket ops
 529 if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
 530    if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
 531        print "Can't find library with socket calls (e.g. accept())"
 532        Exit(1)
 533
 534 # Check for zlib.  If the check passes, libz will be automatically
 535 # added to the LIBS environment variable.
 536 if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
 537     print 'Error: did not find needed zlib compression library '\
 538           'and/or zlib.h header file.'
 539     print '       Please install zlib and try again.'
 540     Exit(1)
 541
 542 # Check for <fenv.h> (C99 FP environment control)
 543 have_fenv = conf.CheckHeader('fenv.h', '<>')
 544 if not have_fenv:
 545     print "Warning: Header file <fenv.h> not found."
 546     print "         This host has no IEEE FP rounding mode control."
 547
 548 # Check for mysql.
 549 mysql_config = WhereIs('mysql_config')
 550 have_mysql = mysql_config != None
 551
 552 # Check MySQL version.
 553 if have_mysql:
 554     mysql_version = os.popen(mysql_config + ' --version').read()
 555     min_mysql_version = '4.1'
 556     if compare_versions(mysql_version, min_mysql_version) < 0:
 557         print 'Warning: MySQL', min_mysql_version, 'or newer required.'
 558         print '         Version', mysql_version, 'detected.'
 559         have_mysql = False
 560
 561 # Set up mysql_config commands.
 562 if have_mysql:
 563     mysql_config_include = mysql_config + ' --include'
 564     if os.system(mysql_config_include + ' > /dev/null') != 0:
 565         # older mysql_config versions don't support --include, use
 566         # --cflags instead
 567         mysql_config_include = mysql_config + ' --cflags | sed s/\\\'//g'
 568     # This seems to work in all versions
 569     mysql_config_libs = mysql_config + ' --libs'
 570
 571 env = conf.Finish()
 572
 573 # Define the universe of supported ISAs
 574 all_isa_list = [ ]
 575 Export('all_isa_list')
 576
 577 # Define the universe of supported CPU models
 578 all_cpu_list = [ ]
 579 default_cpus = [ ]
 580 Export('all_cpu_list', 'default_cpus')
 581
 582 # Sticky options get saved in the options file so they persist from
 583 # one invocation to the next (unless overridden, in which case the new
 584 # value becomes sticky).
 585 sticky_opts = Options(args=ARGUMENTS)
 586 Export('sticky_opts')
 587
 588 # Non-sticky options only apply to the current build.
 589 nonsticky_opts = Options(args=ARGUMENTS)
 590 Export('nonsticky_opts')
 591
 592 # Walk the tree and execute all SConsopts scripts that wil add to the
 593 # above options
 594 for base_dir in base_dir_list:
 595     for root, dirs, files in os.walk(base_dir):
 596         if 'SConsopts' in files:
 597             print "Reading", joinpath(root, 'SConsopts')
 598             SConscript(joinpath(root, 'SConsopts'))
 599
 600 all_isa_list.sort()
 601 all_cpu_list.sort()
 602 default_cpus.sort()
 603
 604 sticky_opts.AddOptions(
 605     EnumOption('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
 606     BoolOption('FULL_SYSTEM', 'Full-system support', False),
 607     # There's a bug in scons 0.96.1 that causes ListOptions with list
 608     # values (more than one value) not to be able to be restored from
 609     # a saved option file.  If this causes trouble then upgrade to
 610     # scons 0.96.90 or later.
 611     ListOption('CPU_MODELS', 'CPU models', default_cpus, all_cpu_list),
 612     BoolOption('NO_FAST_ALLOC', 'Disable fast object allocator', False),
 613     BoolOption('FAST_ALLOC_DEBUG', 'Enable fast object allocator debugging',
 614                False),
 615     BoolOption('FAST_ALLOC_STATS', 'Enable fast object allocator statistics',
 616                False),
 617     BoolOption('EFENCE', 'Link with Electric Fence malloc debugger',
 618                False),
 619     BoolOption('SS_COMPATIBLE_FP',
 620                'Make floating-point results compatible with SimpleScalar',
 621                False),
 622     BoolOption('USE_SSE2',
 623                'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
 624                False),
 625     BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
 626     BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
 627     BoolOption('USE_CHECKER', 'Use checker for detailed CPU models', False),
 628     )
 629
 630 nonsticky_opts.AddOptions(
 631     BoolOption('update_ref', 'Update test reference outputs', False)
 632     )
 633
 634 # These options get exported to #defines in config/*.hh (see src/SConscript).
 635 env.ExportOptions = ['FULL_SYSTEM', 'ALPHA_TLASER', 'USE_FENV', \
 636                      'USE_MYSQL', 'NO_FAST_ALLOC', 'FAST_ALLOC_DEBUG', \
 637                      'FAST_ALLOC_STATS', 'SS_COMPATIBLE_FP', \
 638                      'USE_CHECKER', 'TARGET_ISA']
 639
 640 # Define a handy 'no-op' action
 641 def no_action(target, source, env):
 642     return 0
 643
 644 env.NoAction = Action(no_action, None)
 645
 646 ###################################################
 647 #
 648 # Define a SCons builder for configuration flag headers.
 649 #
 650 ###################################################
 651
 652 # This function generates a config header file that #defines the
 653 # option symbol to the current option setting (0 or 1).  The source
 654 # operands are the name of the option and a Value node containing the
 655 # value of the option.
 656 def build_config_file(target, source, env):
 657     (option, value) = [s.get_contents() for s in source]
 658     f = file(str(target[0]), 'w')
 659     print >> f, '#define', option, value
 660     f.close()
 661     return None
 662
 663 # Generate the message to be printed when building the config file.
 664 def build_config_file_string(target, source, env):
 665     (option, value) = [s.get_contents() for s in source]
 666     return "Defining %s as %s in %s." % (option, value, target[0])
 667
 668 # Combine the two functions into a scons Action object.
 669 config_action = Action(build_config_file, build_config_file_string)
 670
 671 # The emitter munges the source & target node lists to reflect what
 672 # we're really doing.
 673 def config_emitter(target, source, env):
 674     # extract option name from Builder arg
 675     option = str(target[0])
 676     # True target is config header file
 677     target = joinpath('config', option.lower() + '.hh')
 678     val = env[option]
 679     if isinstance(val, bool):
 680         # Force value to 0/1
 681         val = int(val)
 682     elif isinstance(val, str):
 683         val = '"' + val + '"'
 684
 685     # Sources are option name & value (packaged in SCons Value nodes)
 686     return ([target], [Value(option), Value(val)])
 687
 688 config_builder = Builder(emitter = config_emitter, action = config_action)
 689
 690 env.Append(BUILDERS = { 'ConfigFile' : config_builder })
 691
 692 ###################################################
 693 #
 694 # Define a SCons builder for copying files.  This is used by the
 695 # Python zipfile code in src/python/SConscript, but is placed up here
 696 # since it's potentially more generally applicable.
 697 #
 698 ###################################################
 699
 700 copy_builder = Builder(action = Copy("$TARGET", "$SOURCE"))
 701
 702 env.Append(BUILDERS = { 'CopyFile' : copy_builder })
 703
 704 ###################################################
 705 #
 706 # Define a simple SCons builder to concatenate files.
 707 #
 708 # Used to append the Python zip archive to the executable.
 709 #
 710 ###################################################
 711
 712 concat_builder = Builder(action = Action(['cat $SOURCES > $TARGET',
 713                                           'chmod +x $TARGET']))
 714
 715 env.Append(BUILDERS = { 'Concat' : concat_builder })
 716
 717
 718 # libelf build is shared across all configs in the build root.
 719 env.SConscript('ext/libelf/SConscript',
 720                build_dir = joinpath(build_root, 'libelf'),
 721                exports = 'env')
 722
 723 ###################################################
 724 #
 725 # This function is used to set up a directory with switching headers
 726 #
 727 ###################################################
 728
 729 env['ALL_ISA_LIST'] = all_isa_list
 730 def make_switching_dir(dirname, switch_headers, env):
 731     # Generate the header.  target[0] is the full path of the output
 732     # header to generate.  'source' is a dummy variable, since we get the
 733     # list of ISAs from env['ALL_ISA_LIST'].
 734     def gen_switch_hdr(target, source, env):
 735         fname = str(target[0])
 736         basename = os.path.basename(fname)
 737         f = open(fname, 'w')
 738         f.write('#include "arch/isa_specific.hh"\n')
 739         cond = '#if'
 740         for isa in all_isa_list:
 741             f.write('%s THE_ISA == %s_ISA\n#include "%s/%s/%s"\n'
 742                     % (cond, isa.upper(), dirname, isa, basename))
 743             cond = '#elif'
 744         f.write('#else\n#error "THE_ISA not set"\n#endif\n')
 745         f.close()
 746         return 0
 747
 748     # String to print when generating header
 749     def gen_switch_hdr_string(target, source, env):
 750         return "Generating switch header " + str(target[0])
 751
 752     # Build SCons Action object. 'varlist' specifies env vars that this
 753     # action depends on; when env['ALL_ISA_LIST'] changes these actions
 754     # should get re-executed.
 755     switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
 756                                varlist=['ALL_ISA_LIST'])
 757
 758     # Instantiate actions for each header
 759     for hdr in switch_headers:
 760         env.Command(hdr, [], switch_hdr_action)
 761 Export('make_switching_dir')
 762
 763 ###################################################
 764 #
 765 # Define build environments for selected configurations.
 766 #
 767 ###################################################
 768
 769 # rename base env
 770 base_env = env
 771
 772 for build_path in build_paths:
 773     print "Building in", build_path
 774
 775     # Make a copy of the build-root environment to use for this config.
 776     env = base_env.Copy()
 777     env['BUILDDIR'] = build_path
 778
 779     # build_dir is the tail component of build path, and is used to
 780     # determine the build parameters (e.g., 'ALPHA_SE')
 781     (build_root, build_dir) = os.path.split(build_path)
 782
 783     # Set env options according to the build directory config.
 784     sticky_opts.files = []
 785     # Options for $BUILD_ROOT/$BUILD_DIR are stored in
 786     # $BUILD_ROOT/options/$BUILD_DIR so you can nuke
 787     # $BUILD_ROOT/$BUILD_DIR without losing your options settings.
 788     current_opts_file = joinpath(build_root, 'options', build_dir)
 789     if isfile(current_opts_file):
 790         sticky_opts.files.append(current_opts_file)
 791         print "Using saved options file %s" % current_opts_file
 792     else:
 793         # Build dir-specific options file doesn't exist.
 794
 795         # Make sure the directory is there so we can create it later
 796         opt_dir = os.path.dirname(current_opts_file)
 797         if not isdir(opt_dir):
 798             os.mkdir(opt_dir)
 799
 800         # Get default build options from source tree.  Options are
 801         # normally determined by name of $BUILD_DIR, but can be
 802         # overriden by 'default=' arg on command line.
 803         default_opts_file = joinpath('build_opts',
 804                                      ARGUMENTS.get('default', build_dir))
 805         if isfile(default_opts_file):
 806             sticky_opts.files.append(default_opts_file)
 807             print "Options file %s not found,\n  using defaults in %s" \
 808                   % (current_opts_file, default_opts_file)
 809         else:
 810             print "Error: cannot find options file %s or %s" \
 811                   % (current_opts_file, default_opts_file)
 812             Exit(1)
 813
 814     # Apply current option settings to env
 815     sticky_opts.Update(env)
 816     nonsticky_opts.Update(env)
 817
 818     help_text += "\nSticky options for %s:\n" % build_dir \
 819                  + sticky_opts.GenerateHelpText(env) \
 820                  + "\nNon-sticky options for %s:\n" % build_dir \
 821                  + nonsticky_opts.GenerateHelpText(env)
 822
 823     # Process option settings.
 824
 825     if not have_fenv and env['USE_FENV']:
 826         print "Warning: <fenv.h> not available; " \
 827               "forcing USE_FENV to False in", build_dir + "."
 828         env['USE_FENV'] = False
 829
 830     if not env['USE_FENV']:
 831         print "Warning: No IEEE FP rounding mode control in", build_dir + "."
 832         print "         FP results may deviate slightly from other platforms."
 833
 834     if env['EFENCE']:
 835         env.Append(LIBS=['efence'])
 836
 837     if env['USE_MYSQL']:
 838         if not have_mysql:
 839             print "Warning: MySQL not available; " \
 840                   "forcing USE_MYSQL to False in", build_dir + "."
 841             env['USE_MYSQL'] = False
 842         else:
 843             print "Compiling in", build_dir, "with MySQL support."
 844             env.ParseConfig(mysql_config_libs)
 845             env.ParseConfig(mysql_config_include)
 846
 847     # Save sticky option settings back to current options file
 848     sticky_opts.Save(current_opts_file, env)
 849
 850     if env['USE_SSE2']:
 851         env.Append(CCFLAGS='-msse2')
 852
 853     # The src/SConscript file sets up the build rules in 'env' according
 854     # to the configured options.  It returns a list of environments,
 855     # one for each variant build (debug, opt, etc.)
 856     envList = SConscript('src/SConscript', build_dir = build_path,
 857                          exports = 'env')
 858
 859     # Set up the regression tests for each build.
 860     for e in envList:
 861         SConscript('tests/SConscript',
 862                    build_dir = joinpath(build_path, 'tests', e.Label),
 863                    exports = { 'env' : e }, duplicate = False)
 864
 865 Help(help_text)
 866
 867
 868 ###################################################
 869 #
 870 # Let SCons do its thing.  At this point SCons will use the defined
 871 # build environments to build the requested targets.
 872 #
 873 ###################################################
 874