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 # Python library imports
  67 import sys
  68 import os
  69
  70 # Check for recent-enough Python and SCons versions.  If your system's
  71 # default installation of Python is not recent enough, you can use a
  72 # non-default installation of the Python interpreter by either (1)
  73 # rearranging your PATH so that scons finds the non-default 'python'
  74 # first or (2) explicitly invoking an alternative interpreter on the
  75 # scons script, e.g., "/usr/local/bin/python2.4 `which scons` [args]".
  76 EnsurePythonVersion(2,4)
  77
  78 # Ironically, SCons 0.96 dies if you give EnsureSconsVersion a
  79 # 3-element version number.
  80 min_scons_version = (0,96,91)
  81 try:
  82     EnsureSConsVersion(*min_scons_version)
  83 except:
  84     print "Error checking current SCons version."
  85     print "SCons", ".".join(map(str,min_scons_version)), "or greater required."
  86     Exit(2)
  87
  88
  89 # The absolute path to the current directory (where this file lives).
  90 ROOT = Dir('.').abspath
  91
  92 # Paths to the M5 and external source trees.
  93 SRCDIR = os.path.join(ROOT, 'src')
  94
  95 # tell python where to find m5 python code
  96 sys.path.append(os.path.join(ROOT, 'src/python'))
  97
  98 ###################################################
  99 #
 100 # Figure out which configurations to set up based on the path(s) of
 101 # the target(s).
 102 #
 103 ###################################################
 104
 105 # Find default configuration & binary.
 106 Default(os.environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
 107
 108 # Ask SCons which directory it was invoked from.
 109 launch_dir = GetLaunchDir()
 110
 111 # Make targets relative to invocation directory
 112 abs_targets = map(lambda x: os.path.normpath(os.path.join(launch_dir, str(x))),
 113                   BUILD_TARGETS)
 114
 115 # helper function: find last occurrence of element in list
 116 def rfind(l, elt, offs = -1):
 117     for i in range(len(l)+offs, 0, -1):
 118         if l[i] == elt:
 119             return i
 120     raise ValueError, "element not found"
 121
 122 # helper function: compare dotted version numbers.
 123 # E.g., compare_version('1.3.25', '1.4.1')
 124 # returns -1, 0, 1 if v1 is <, ==, > v2
 125 def compare_versions(v1, v2):
 126     # Convert dotted strings to lists
 127     v1 = map(int, v1.split('.'))
 128     v2 = map(int, v2.split('.'))
 129     # Compare corresponding elements of lists
 130     for n1,n2 in zip(v1, v2):
 131         if n1 < n2: return -1
 132         if n1 > n2: return  1
 133     # all corresponding values are equal... see if one has extra values
 134     if len(v1) < len(v2): return -1
 135     if len(v1) > len(v2): return  1
 136     return 0
 137
 138 # Each target must have 'build' in the interior of the path; the
 139 # directory below this will determine the build parameters.  For
 140 # example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
 141 # recognize that ALPHA_SE specifies the configuration because it
 142 # follow 'build' in the bulid path.
 143
 144 # Generate a list of the unique build roots and configs that the
 145 # collected targets reference.
 146 build_paths = []
 147 build_root = None
 148 for t in abs_targets:
 149     path_dirs = t.split('/')
 150     try:
 151         build_top = rfind(path_dirs, 'build', -2)
 152     except:
 153         print "Error: no non-leaf 'build' dir found on target path", t
 154         Exit(1)
 155     this_build_root = os.path.join('/',*path_dirs[:build_top+1])
 156     if not build_root:
 157         build_root = this_build_root
 158     else:
 159         if this_build_root != build_root:
 160             print "Error: build targets not under same build root\n"\
 161                   "  %s\n  %s" % (build_root, this_build_root)
 162             Exit(1)
 163     build_path = os.path.join('/',*path_dirs[:build_top+2])
 164     if build_path not in build_paths:
 165         build_paths.append(build_path)
 166
 167 ###################################################
 168 #
 169 # Set up the default build environment.  This environment is copied
 170 # and modified according to each selected configuration.
 171 #
 172 ###################################################
 173
 174 env = Environment(ENV = os.environ,  # inherit user's environment vars
 175                   ROOT = ROOT,
 176                   SRCDIR = SRCDIR)
 177
 178 #Parse CC/CXX early so that we use the correct compiler for
 179 # to test for dependencies/versions/libraries/includes
 180 if ARGUMENTS.get('CC', None):
 181     env['CC'] = ARGUMENTS.get('CC')
 182
 183 if ARGUMENTS.get('CXX', None):
 184     env['CXX'] = ARGUMENTS.get('CXX')
 185
 186 env.SConsignFile(os.path.join(build_root,"sconsign"))
 187
 188 # Default duplicate option is to use hard links, but this messes up
 189 # when you use emacs to edit a file in the target dir, as emacs moves
 190 # file to file~ then copies to file, breaking the link.  Symbolic
 191 # (soft) links work better.
 192 env.SetOption('duplicate', 'soft-copy')
 193
 194 # I waffle on this setting... it does avoid a few painful but
 195 # unnecessary builds, but it also seems to make trivial builds take
 196 # noticeably longer.
 197 if False:
 198     env.TargetSignatures('content')
 199
 200 # M5_PLY is used by isa_parser.py to find the PLY package.
 201 env.Append(ENV = { 'M5_PLY' : Dir('ext/ply') })
 202
 203 # Set up default C++ compiler flags
 204 env.Append(CCFLAGS='-pipe')
 205 env.Append(CCFLAGS='-fno-strict-aliasing')
 206 env.Append(CCFLAGS=Split('-Wall -Wno-sign-compare -Werror -Wundef'))
 207 if sys.platform == 'cygwin':
 208     # cygwin has some header file issues...
 209     env.Append(CCFLAGS=Split("-Wno-uninitialized"))
 210 env.Append(CPPPATH=[Dir('ext/dnet')])
 211
 212 # Check for SWIG
 213 if not env.has_key('SWIG'):
 214     print 'Error: SWIG utility not found.'
 215     print '       Please install (see http://www.swig.org) and retry.'
 216     Exit(1)
 217
 218 # Check for appropriate SWIG version
 219 swig_version = os.popen('swig -version').read().split()
 220 # First 3 words should be "SWIG Version x.y.z"
 221 if swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
 222     print 'Error determining SWIG version.'
 223     Exit(1)
 224
 225 min_swig_version = '1.3.28'
 226 if compare_versions(swig_version[2], min_swig_version) < 0:
 227     print 'Error: SWIG version', min_swig_version, 'or newer required.'
 228     print '       Installed version:', swig_version[2]
 229     Exit(1)
 230
 231 # Set up SWIG flags & scanner
 232 env.Append(SWIGFLAGS=Split('-c++ -python -modern $_CPPINCFLAGS'))
 233
 234 import SCons.Scanner
 235
 236 swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
 237
 238 swig_scanner = SCons.Scanner.ClassicCPP("SwigScan", ".i", "CPPPATH",
 239                                         swig_inc_re)
 240
 241 env.Append(SCANNERS = swig_scanner)
 242
 243 # Platform-specific configuration.  Note again that we assume that all
 244 # builds under a given build root run on the same host platform.
 245 conf = Configure(env,
 246                  conf_dir = os.path.join(build_root, '.scons_config'),
 247                  log_file = os.path.join(build_root, 'scons_config.log'))
 248
 249 # Find Python include and library directories for embedding the
 250 # interpreter.  For consistency, we will use the same Python
 251 # installation used to run scons (and thus this script).  If you want
 252 # to link in an alternate version, see above for instructions on how
 253 # to invoke scons with a different copy of the Python interpreter.
 254
 255 # Get brief Python version name (e.g., "python2.4") for locating
 256 # include & library files
 257 py_version_name = 'python' + sys.version[:3]
 258
 259 # include path, e.g. /usr/local/include/python2.4
 260 py_header_path = os.path.join(sys.exec_prefix, 'include', py_version_name)
 261 env.Append(CPPPATH = py_header_path)
 262 # verify that it works
 263 if not conf.CheckHeader('Python.h', '<>'):
 264     print "Error: can't find Python.h header in", py_header_path
 265     Exit(1)
 266
 267 # add library path too if it's not in the default place
 268 py_lib_path = None
 269 if sys.exec_prefix != '/usr':
 270     py_lib_path = os.path.join(sys.exec_prefix, 'lib')
 271 elif sys.platform == 'cygwin':
 272     # cygwin puts the .dll in /bin for some reason
 273     py_lib_path = '/bin'
 274 if py_lib_path:
 275     env.Append(LIBPATH = py_lib_path)
 276     print 'Adding', py_lib_path, 'to LIBPATH for', py_version_name
 277 if not conf.CheckLib(py_version_name):
 278     print "Error: can't find Python library", py_version_name
 279     Exit(1)
 280
 281 # On Solaris you need to use libsocket for socket ops
 282 if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
 283    if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
 284        print "Can't find library with socket calls (e.g. accept())"
 285        Exit(1)
 286
 287 # Check for zlib.  If the check passes, libz will be automatically
 288 # added to the LIBS environment variable.
 289 if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++'):
 290     print 'Error: did not find needed zlib compression library '\
 291           'and/or zlib.h header file.'
 292     print '       Please install zlib and try again.'
 293     Exit(1)
 294
 295 # Check for <fenv.h> (C99 FP environment control)
 296 have_fenv = conf.CheckHeader('fenv.h', '<>')
 297 if not have_fenv:
 298     print "Warning: Header file <fenv.h> not found."
 299     print "         This host has no IEEE FP rounding mode control."
 300
 301 # Check for mysql.
 302 mysql_config = WhereIs('mysql_config')
 303 have_mysql = mysql_config != None
 304
 305 # Check MySQL version.
 306 if have_mysql:
 307     mysql_version = os.popen(mysql_config + ' --version').read()
 308     min_mysql_version = '4.1'
 309     if compare_versions(mysql_version, min_mysql_version) < 0:
 310         print 'Warning: MySQL', min_mysql_version, 'or newer required.'
 311         print '         Version', mysql_version, 'detected.'
 312         have_mysql = False
 313
 314 # Set up mysql_config commands.
 315 if have_mysql:
 316     mysql_config_include = mysql_config + ' --include'
 317     if os.system(mysql_config_include + ' > /dev/null') != 0:
 318         # older mysql_config versions don't support --include, use
 319         # --cflags instead
 320         mysql_config_include = mysql_config + ' --cflags | sed s/\\\'//g'
 321     # This seems to work in all versions
 322     mysql_config_libs = mysql_config + ' --libs'
 323
 324 env = conf.Finish()
 325
 326 # Define the universe of supported ISAs
 327 env['ALL_ISA_LIST'] = ['alpha', 'sparc', 'mips']
 328
 329 # Define the universe of supported CPU models
 330 env['ALL_CPU_LIST'] = ['AtomicSimpleCPU', 'TimingSimpleCPU',
 331                        'O3CPU', 'OzoneCPU']
 332
 333 if os.path.isdir(os.path.join(SRCDIR, 'src/encumbered/cpu/full')):
 334     env['ALL_CPU_LIST'] += ['FullCPU']
 335
 336 # Sticky options get saved in the options file so they persist from
 337 # one invocation to the next (unless overridden, in which case the new
 338 # value becomes sticky).
 339 sticky_opts = Options(args=ARGUMENTS)
 340 sticky_opts.AddOptions(
 341     EnumOption('TARGET_ISA', 'Target ISA', 'alpha', env['ALL_ISA_LIST']),
 342     BoolOption('FULL_SYSTEM', 'Full-system support', False),
 343     # There's a bug in scons 0.96.1 that causes ListOptions with list
 344     # values (more than one value) not to be able to be restored from
 345     # a saved option file.  If this causes trouble then upgrade to
 346     # scons 0.96.90 or later.
 347     ListOption('CPU_MODELS', 'CPU models', 'AtomicSimpleCPU,TimingSimpleCPU,O3CPU',
 348                env['ALL_CPU_LIST']),
 349     BoolOption('ALPHA_TLASER',
 350                'Model Alpha TurboLaser platform (vs. Tsunami)', False),
 351     BoolOption('NO_FAST_ALLOC', 'Disable fast object allocator', False),
 352     BoolOption('EFENCE', 'Link with Electric Fence malloc debugger',
 353                False),
 354     BoolOption('SS_COMPATIBLE_FP',
 355                'Make floating-point results compatible with SimpleScalar',
 356                False),
 357     BoolOption('USE_SSE2',
 358                'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
 359                False),
 360     BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
 361     BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
 362     BoolOption('USE_CHECKER', 'Use checker for detailed CPU models', False),
 363     ('CC', 'C compiler', os.environ.get('CC', env['CC'])),
 364     ('CXX', 'C++ compiler', os.environ.get('CXX', env['CXX'])),
 365     BoolOption('BATCH', 'Use batch pool for build and tests', False),
 366     ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
 367     ('PYTHONHOME',
 368      'Override the default PYTHONHOME for this system (use with caution)',
 369      '%s:%s' % (sys.prefix, sys.exec_prefix))
 370     )
 371
 372 # Non-sticky options only apply to the current build.
 373 nonsticky_opts = Options(args=ARGUMENTS)
 374 nonsticky_opts.AddOptions(
 375     BoolOption('update_ref', 'Update test reference outputs', False)
 376     )
 377
 378 # These options get exported to #defines in config/*.hh (see src/SConscript).
 379 env.ExportOptions = ['FULL_SYSTEM', 'ALPHA_TLASER', 'USE_FENV', \
 380                      'USE_MYSQL', 'NO_FAST_ALLOC', 'SS_COMPATIBLE_FP', \
 381                      'USE_CHECKER', 'PYTHONHOME', 'TARGET_ISA']
 382
 383 # Define a handy 'no-op' action
 384 def no_action(target, source, env):
 385     return 0
 386
 387 env.NoAction = Action(no_action, None)
 388
 389 ###################################################
 390 #
 391 # Define a SCons builder for configuration flag headers.
 392 #
 393 ###################################################
 394
 395 # This function generates a config header file that #defines the
 396 # option symbol to the current option setting (0 or 1).  The source
 397 # operands are the name of the option and a Value node containing the
 398 # value of the option.
 399 def build_config_file(target, source, env):
 400     (option, value) = [s.get_contents() for s in source]
 401     f = file(str(target[0]), 'w')
 402     print >> f, '#define', option, value
 403     f.close()
 404     return None
 405
 406 # Generate the message to be printed when building the config file.
 407 def build_config_file_string(target, source, env):
 408     (option, value) = [s.get_contents() for s in source]
 409     return "Defining %s as %s in %s." % (option, value, target[0])
 410
 411 # Combine the two functions into a scons Action object.
 412 config_action = Action(build_config_file, build_config_file_string)
 413
 414 # The emitter munges the source & target node lists to reflect what
 415 # we're really doing.
 416 def config_emitter(target, source, env):
 417     # extract option name from Builder arg
 418     option = str(target[0])
 419     # True target is config header file
 420     target = os.path.join('config', option.lower() + '.hh')
 421     val = env[option]
 422     if isinstance(val, bool):
 423         # Force value to 0/1
 424         val = int(val)
 425     elif isinstance(val, str):
 426         val = '"' + val + '"'
 427
 428     # Sources are option name & value (packaged in SCons Value nodes)
 429     return ([target], [Value(option), Value(val)])
 430
 431 config_builder = Builder(emitter = config_emitter, action = config_action)
 432
 433 env.Append(BUILDERS = { 'ConfigFile' : config_builder })
 434
 435 ###################################################
 436 #
 437 # Define a SCons builder for copying files.  This is used by the
 438 # Python zipfile code in src/python/SConscript, but is placed up here
 439 # since it's potentially more generally applicable.
 440 #
 441 ###################################################
 442
 443 copy_builder = Builder(action = Copy("$TARGET", "$SOURCE"))
 444
 445 env.Append(BUILDERS = { 'CopyFile' : copy_builder })
 446
 447 ###################################################
 448 #
 449 # Define a simple SCons builder to concatenate files.
 450 #
 451 # Used to append the Python zip archive to the executable.
 452 #
 453 ###################################################
 454
 455 concat_builder = Builder(action = Action(['cat $SOURCES > $TARGET',
 456                                           'chmod +x $TARGET']))
 457
 458 env.Append(BUILDERS = { 'Concat' : concat_builder })
 459
 460
 461 # base help text
 462 help_text = '''
 463 Usage: scons [scons options] [build options] [target(s)]
 464
 465 '''
 466
 467 # libelf build is shared across all configs in the build root.
 468 env.SConscript('ext/libelf/SConscript',
 469                build_dir = os.path.join(build_root, 'libelf'),
 470                exports = 'env')
 471
 472 ###################################################
 473 #
 474 # This function is used to set up a directory with switching headers
 475 #
 476 ###################################################
 477
 478 def make_switching_dir(dirname, switch_headers, env):
 479     # Generate the header.  target[0] is the full path of the output
 480     # header to generate.  'source' is a dummy variable, since we get the
 481     # list of ISAs from env['ALL_ISA_LIST'].
 482     def gen_switch_hdr(target, source, env):
 483         fname = str(target[0])
 484         basename = os.path.basename(fname)
 485         f = open(fname, 'w')
 486         f.write('#include "arch/isa_specific.hh"\n')
 487         cond = '#if'
 488         for isa in env['ALL_ISA_LIST']:
 489             f.write('%s THE_ISA == %s_ISA\n#include "%s/%s/%s"\n'
 490                     % (cond, isa.upper(), dirname, isa, basename))
 491             cond = '#elif'
 492         f.write('#else\n#error "THE_ISA not set"\n#endif\n')
 493         f.close()
 494         return 0
 495
 496     # String to print when generating header
 497     def gen_switch_hdr_string(target, source, env):
 498         return "Generating switch header " + str(target[0])
 499
 500     # Build SCons Action object. 'varlist' specifies env vars that this
 501     # action depends on; when env['ALL_ISA_LIST'] changes these actions
 502     # should get re-executed.
 503     switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
 504                                varlist=['ALL_ISA_LIST'])
 505
 506     # Instantiate actions for each header
 507     for hdr in switch_headers:
 508         env.Command(hdr, [], switch_hdr_action)
 509
 510 env.make_switching_dir = make_switching_dir
 511
 512 ###################################################
 513 #
 514 # Define build environments for selected configurations.
 515 #
 516 ###################################################
 517
 518 # rename base env
 519 base_env = env
 520
 521 for build_path in build_paths:
 522     print "Building in", build_path
 523     # build_dir is the tail component of build path, and is used to
 524     # determine the build parameters (e.g., 'ALPHA_SE')
 525     (build_root, build_dir) = os.path.split(build_path)
 526     # Make a copy of the build-root environment to use for this config.
 527     env = base_env.Copy()
 528
 529     # Set env options according to the build directory config.
 530     sticky_opts.files = []
 531     # Options for $BUILD_ROOT/$BUILD_DIR are stored in
 532     # $BUILD_ROOT/options/$BUILD_DIR so you can nuke
 533     # $BUILD_ROOT/$BUILD_DIR without losing your options settings.
 534     current_opts_file = os.path.join(build_root, 'options', build_dir)
 535     if os.path.isfile(current_opts_file):
 536         sticky_opts.files.append(current_opts_file)
 537         print "Using saved options file %s" % current_opts_file
 538     else:
 539         # Build dir-specific options file doesn't exist.
 540
 541         # Make sure the directory is there so we can create it later
 542         opt_dir = os.path.dirname(current_opts_file)
 543         if not os.path.isdir(opt_dir):
 544             os.mkdir(opt_dir)
 545
 546         # Get default build options from source tree.  Options are
 547         # normally determined by name of $BUILD_DIR, but can be
 548         # overriden by 'default=' arg on command line.
 549         default_opts_file = os.path.join('build_opts',
 550                                          ARGUMENTS.get('default', build_dir))
 551         if os.path.isfile(default_opts_file):
 552             sticky_opts.files.append(default_opts_file)
 553             print "Options file %s not found,\n  using defaults in %s" \
 554                   % (current_opts_file, default_opts_file)
 555         else:
 556             print "Error: cannot find options file %s or %s" \
 557                   % (current_opts_file, default_opts_file)
 558             Exit(1)
 559
 560     # Apply current option settings to env
 561     sticky_opts.Update(env)
 562     nonsticky_opts.Update(env)
 563
 564     help_text += "Sticky options for %s:\n" % build_dir \
 565                  + sticky_opts.GenerateHelpText(env) \
 566                  + "\nNon-sticky options for %s:\n" % build_dir \
 567                  + nonsticky_opts.GenerateHelpText(env)
 568
 569     # Process option settings.
 570
 571     if not have_fenv and env['USE_FENV']:
 572         print "Warning: <fenv.h> not available; " \
 573               "forcing USE_FENV to False in", build_dir + "."
 574         env['USE_FENV'] = False
 575
 576     if not env['USE_FENV']:
 577         print "Warning: No IEEE FP rounding mode control in", build_dir + "."
 578         print "         FP results may deviate slightly from other platforms."
 579
 580     if env['EFENCE']:
 581         env.Append(LIBS=['efence'])
 582
 583     if env['USE_MYSQL']:
 584         if not have_mysql:
 585             print "Warning: MySQL not available; " \
 586                   "forcing USE_MYSQL to False in", build_dir + "."
 587             env['USE_MYSQL'] = False
 588         else:
 589             print "Compiling in", build_dir, "with MySQL support."
 590             env.ParseConfig(mysql_config_libs)
 591             env.ParseConfig(mysql_config_include)
 592
 593     # Save sticky option settings back to current options file
 594     sticky_opts.Save(current_opts_file, env)
 595
 596     # Do this after we save setting back, or else we'll tack on an
 597     # extra 'qdo' every time we run scons.
 598     if env['BATCH']:
 599         env['CC']  = env['BATCH_CMD'] + ' ' + env['CC']
 600         env['CXX'] = env['BATCH_CMD'] + ' ' + env['CXX']
 601
 602     if env['USE_SSE2']:
 603         env.Append(CCFLAGS='-msse2')
 604
 605     # The src/SConscript file sets up the build rules in 'env' according
 606     # to the configured options.  It returns a list of environments,
 607     # one for each variant build (debug, opt, etc.)
 608     envList = SConscript('src/SConscript', build_dir = build_path,
 609                          exports = 'env')
 610
 611     # Set up the regression tests for each build.
 612     for e in envList:
 613         SConscript('tests/SConscript',
 614                    build_dir = os.path.join(build_path, 'tests', e.Label),
 615                    exports = { 'env' : e }, duplicate = False)
 616
 617 Help(help_text)
 618
 619
 620 ###################################################
 621 #
 622 # Let SCons do its thing.  At this point SCons will use the defined
 623 # build environments to build the requested targets.
 624 #
 625 ###################################################
 626