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