SConstruct revision 5273
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
66import sys
67import os
68
69from os.path import isdir, join as joinpath
70
71import SCons
72
73# Check for recent-enough Python and SCons versions.  If your system's
74# default installation of Python is not recent enough, you can use a
75# non-default installation of the Python interpreter by either (1)
76# rearranging your PATH so that scons finds the non-default 'python'
77# first or (2) explicitly invoking an alternative interpreter on the
78# scons script, e.g., "/usr/local/bin/python2.4 `which scons` [args]".
79EnsurePythonVersion(2,4)
80
81# Import subprocess after we check the version since it doesn't exist in
82# Python < 2.4.
83import subprocess
84
85# Ironically, SCons 0.96 dies if you give EnsureSconsVersion a
86# 3-element version number.
87min_scons_version = (0,96,91)
88try:
89    EnsureSConsVersion(*min_scons_version)
90except:
91    print "Error checking current SCons version."
92    print "SCons", ".".join(map(str,min_scons_version)), "or greater required."
93    Exit(2)
94
95
96# The absolute path to the current directory (where this file lives).
97ROOT = Dir('.').abspath
98
99# Path to the M5 source tree.
100SRCDIR = joinpath(ROOT, 'src')
101
102# tell python where to find m5 python code
103sys.path.append(joinpath(ROOT, 'src/python'))
104
105def check_style_hook(ui):
106    ui.readconfig(joinpath(ROOT, '.hg', 'hgrc'))
107    style_hook = ui.config('hooks', 'pretxncommit.style', None)
108
109    if not style_hook:
110        print """\
111You're missing the M5 style hook.
112Please install the hook so we can ensure that all code fits a common style.
113
114All you'd need to do is add the following lines to your repository .hg/hgrc
115or your personal .hgrc
116----------------
117
118[extensions]
119style = %s/util/style.py
120
121[hooks]
122pretxncommit.style = python:style.check_whitespace
123""" % (ROOT)
124        sys.exit(1)
125
126if ARGUMENTS.get('IGNORE_STYLE') != 'True' and isdir(joinpath(ROOT, '.hg')):
127    try:
128        from mercurial import ui
129        check_style_hook(ui.ui())
130    except ImportError:
131        pass
132
133###################################################
134#
135# Figure out which configurations to set up based on the path(s) of
136# the target(s).
137#
138###################################################
139
140# Find default configuration & binary.
141Default(os.environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
142
143# helper function: find last occurrence of element in list
144def rfind(l, elt, offs = -1):
145    for i in range(len(l)+offs, 0, -1):
146        if l[i] == elt:
147            return i
148    raise ValueError, "element not found"
149
150# helper function: compare dotted version numbers.
151# E.g., compare_version('1.3.25', '1.4.1')
152# returns -1, 0, 1 if v1 is <, ==, > v2
153def compare_versions(v1, v2):
154    # Convert dotted strings to lists
155    v1 = map(int, v1.split('.'))
156    v2 = map(int, v2.split('.'))
157    # Compare corresponding elements of lists
158    for n1,n2 in zip(v1, v2):
159        if n1 < n2: return -1
160        if n1 > n2: return  1
161    # all corresponding values are equal... see if one has extra values
162    if len(v1) < len(v2): return -1
163    if len(v1) > len(v2): return  1
164    return 0
165
166# Each target must have 'build' in the interior of the path; the
167# directory below this will determine the build parameters.  For
168# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
169# recognize that ALPHA_SE specifies the configuration because it
170# follow 'build' in the bulid path.
171
172# Generate absolute paths to targets so we can see where the build dir is
173if COMMAND_LINE_TARGETS:
174    # Ask SCons which directory it was invoked from
175    launch_dir = GetLaunchDir()
176    # Make targets relative to invocation directory
177    abs_targets = map(lambda x: os.path.normpath(joinpath(launch_dir, str(x))),
178                      COMMAND_LINE_TARGETS)
179else:
180    # Default targets are relative to root of tree
181    abs_targets = map(lambda x: os.path.normpath(joinpath(ROOT, str(x))),
182                      DEFAULT_TARGETS)
183
184
185# Generate a list of the unique build roots and configs that the
186# collected targets reference.
187build_paths = []
188build_root = None
189for t in abs_targets:
190    path_dirs = t.split('/')
191    try:
192        build_top = rfind(path_dirs, 'build', -2)
193    except:
194        print "Error: no non-leaf 'build' dir found on target path", t
195        Exit(1)
196    this_build_root = joinpath('/',*path_dirs[:build_top+1])
197    if not build_root:
198        build_root = this_build_root
199    else:
200        if this_build_root != build_root:
201            print "Error: build targets not under same build root\n"\
202                  "  %s\n  %s" % (build_root, this_build_root)
203            Exit(1)
204    build_path = joinpath('/',*path_dirs[:build_top+2])
205    if build_path not in build_paths:
206        build_paths.append(build_path)
207
208###################################################
209#
210# Set up the default build environment.  This environment is copied
211# and modified according to each selected configuration.
212#
213###################################################
214
215env = Environment(ENV = os.environ,  # inherit user's environment vars
216                  ROOT = ROOT,
217                  SRCDIR = SRCDIR)
218
219#Parse CC/CXX early so that we use the correct compiler for
220# to test for dependencies/versions/libraries/includes
221if ARGUMENTS.get('CC', None):
222    env['CC'] = ARGUMENTS.get('CC')
223
224if ARGUMENTS.get('CXX', None):
225    env['CXX'] = ARGUMENTS.get('CXX')
226
227Export('env')
228
229env.SConsignFile(joinpath(build_root,"sconsign"))
230
231# Default duplicate option is to use hard links, but this messes up
232# when you use emacs to edit a file in the target dir, as emacs moves
233# file to file~ then copies to file, breaking the link.  Symbolic
234# (soft) links work better.
235env.SetOption('duplicate', 'soft-copy')
236
237# I waffle on this setting... it does avoid a few painful but
238# unnecessary builds, but it also seems to make trivial builds take
239# noticeably longer.
240if False:
241    env.TargetSignatures('content')
242
243# M5_PLY is used by isa_parser.py to find the PLY package.
244env.Append(ENV = { 'M5_PLY' : str(Dir('ext/ply')) })
245env['GCC'] = False
246env['SUNCC'] = False
247env['ICC'] = False
248env['GCC'] = subprocess.Popen(env['CXX'] + ' --version', shell=True,
249        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
250        close_fds=True).communicate()[0].find('GCC') >= 0
251env['SUNCC'] = subprocess.Popen(env['CXX'] + ' -V', shell=True,
252        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
253        close_fds=True).communicate()[0].find('Sun C++') >= 0
254env['ICC'] = subprocess.Popen(env['CXX'] + ' -V', shell=True,
255        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
256        close_fds=True).communicate()[0].find('Intel') >= 0
257if env['GCC'] + env['SUNCC'] + env['ICC'] > 1:
258    print 'Error: How can we have two at the same time?'
259    Exit(1)
260
261
262# Set up default C++ compiler flags
263if env['GCC']:
264    env.Append(CCFLAGS='-pipe')
265    env.Append(CCFLAGS='-fno-strict-aliasing')
266    env.Append(CCFLAGS=Split('-Wall -Wno-sign-compare -Werror -Wundef'))
267elif env['ICC']:
268    pass #Fix me... add warning flags once we clean up icc warnings
269elif env['SUNCC']:
270    env.Append(CCFLAGS='-Qoption ccfe')
271    env.Append(CCFLAGS='-features=gcc')
272    env.Append(CCFLAGS='-features=extensions')
273    env.Append(CCFLAGS='-library=stlport4')
274    env.Append(CCFLAGS='-xar')
275#    env.Append(CCFLAGS='-instances=semiexplicit')
276else:
277    print 'Error: Don\'t know what compiler options to use for your compiler.'
278    print '       Please fix SConstruct and src/SConscript and try again.'
279    Exit(1)
280
281if sys.platform == 'cygwin':
282    # cygwin has some header file issues...
283    env.Append(CCFLAGS=Split("-Wno-uninitialized"))
284env.Append(CPPPATH=[Dir('ext/dnet')])
285
286# Check for SWIG
287if not env.has_key('SWIG'):
288    print 'Error: SWIG utility not found.'
289    print '       Please install (see http://www.swig.org) and retry.'
290    Exit(1)
291
292# Check for appropriate SWIG version
293swig_version = os.popen('swig -version').read().split()
294# First 3 words should be "SWIG Version x.y.z"
295if len(swig_version) < 3 or \
296        swig_version[0] != 'SWIG' or swig_version[1] != 'Version':
297    print 'Error determining SWIG version.'
298    Exit(1)
299
300min_swig_version = '1.3.28'
301if compare_versions(swig_version[2], min_swig_version) < 0:
302    print 'Error: SWIG version', min_swig_version, 'or newer required.'
303    print '       Installed version:', swig_version[2]
304    Exit(1)
305
306# Set up SWIG flags & scanner
307swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
308env.Append(SWIGFLAGS=swig_flags)
309
310# filter out all existing swig scanners, they mess up the dependency
311# stuff for some reason
312scanners = []
313for scanner in env['SCANNERS']:
314    skeys = scanner.skeys
315    if skeys == '.i':
316        continue
317
318    if isinstance(skeys, (list, tuple)) and '.i' in skeys:
319        continue
320
321    scanners.append(scanner)
322
323# add the new swig scanner that we like better
324from SCons.Scanner import ClassicCPP as CPPScanner
325swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
326scanners.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re))
327
328# replace the scanners list that has what we want
329env['SCANNERS'] = scanners
330
331# Platform-specific configuration.  Note again that we assume that all
332# builds under a given build root run on the same host platform.
333conf = Configure(env,
334                 conf_dir = joinpath(build_root, '.scons_config'),
335                 log_file = joinpath(build_root, 'scons_config.log'))
336
337# Check if we should compile a 64 bit binary on Mac OS X/Darwin
338try:
339    import platform
340    uname = platform.uname()
341    if uname[0] == 'Darwin' and compare_versions(uname[2], '9.0.0') >= 0:
342        if int(subprocess.Popen('sysctl -n hw.cpu64bit_capable', shell=True,
343               stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
344               close_fds=True).communicate()[0][0]):
345            env.Append(CCFLAGS='-arch x86_64')
346            env.Append(CFLAGS='-arch x86_64')
347            env.Append(LINKFLAGS='-arch x86_64')
348            env.Append(ASFLAGS='-arch x86_64')
349except:
350    pass
351
352# Recent versions of scons substitute a "Null" object for Configure()
353# when configuration isn't necessary, e.g., if the "--help" option is
354# present.  Unfortuantely this Null object always returns false,
355# breaking all our configuration checks.  We replace it with our own
356# more optimistic null object that returns True instead.
357if not conf:
358    def NullCheck(*args, **kwargs):
359        return True
360
361    class NullConf:
362        def __init__(self, env):
363            self.env = env
364        def Finish(self):
365            return self.env
366        def __getattr__(self, mname):
367            return NullCheck
368
369    conf = NullConf(env)
370
371# Find Python include and library directories for embedding the
372# interpreter.  For consistency, we will use the same Python
373# installation used to run scons (and thus this script).  If you want
374# to link in an alternate version, see above for instructions on how
375# to invoke scons with a different copy of the Python interpreter.
376
377# Get brief Python version name (e.g., "python2.4") for locating
378# include & library files
379py_version_name = 'python' + sys.version[:3]
380
381# include path, e.g. /usr/local/include/python2.4
382py_header_path = joinpath(sys.exec_prefix, 'include', py_version_name)
383env.Append(CPPPATH = py_header_path)
384# verify that it works
385if not conf.CheckHeader('Python.h', '<>'):
386    print "Error: can't find Python.h header in", py_header_path
387    Exit(1)
388
389# add library path too if it's not in the default place
390py_lib_path = None
391if sys.exec_prefix != '/usr':
392    py_lib_path = joinpath(sys.exec_prefix, 'lib')
393elif sys.platform == 'cygwin':
394    # cygwin puts the .dll in /bin for some reason
395    py_lib_path = '/bin'
396if py_lib_path:
397    env.Append(LIBPATH = py_lib_path)
398    print 'Adding', py_lib_path, 'to LIBPATH for', py_version_name
399if not conf.CheckLib(py_version_name):
400    print "Error: can't find Python library", py_version_name
401    Exit(1)
402
403# On Solaris you need to use libsocket for socket ops
404if not conf.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
405   if not conf.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
406       print "Can't find library with socket calls (e.g. accept())"
407       Exit(1)
408
409# Check for zlib.  If the check passes, libz will be automatically
410# added to the LIBS environment variable.
411if not conf.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
412    print 'Error: did not find needed zlib compression library '\
413          'and/or zlib.h header file.'
414    print '       Please install zlib and try again.'
415    Exit(1)
416
417# Check for <fenv.h> (C99 FP environment control)
418have_fenv = conf.CheckHeader('fenv.h', '<>')
419if not have_fenv:
420    print "Warning: Header file <fenv.h> not found."
421    print "         This host has no IEEE FP rounding mode control."
422
423# Check for mysql.
424mysql_config = WhereIs('mysql_config')
425have_mysql = mysql_config != None
426
427# Check MySQL version.
428if have_mysql:
429    mysql_version = os.popen(mysql_config + ' --version').read()
430    min_mysql_version = '4.1'
431    if compare_versions(mysql_version, min_mysql_version) < 0:
432        print 'Warning: MySQL', min_mysql_version, 'or newer required.'
433        print '         Version', mysql_version, 'detected.'
434        have_mysql = False
435
436# Set up mysql_config commands.
437if have_mysql:
438    mysql_config_include = mysql_config + ' --include'
439    if os.system(mysql_config_include + ' > /dev/null') != 0:
440        # older mysql_config versions don't support --include, use
441        # --cflags instead
442        mysql_config_include = mysql_config + ' --cflags | sed s/\\\'//g'
443    # This seems to work in all versions
444    mysql_config_libs = mysql_config + ' --libs'
445
446env = conf.Finish()
447
448# Define the universe of supported ISAs
449all_isa_list = [ ]
450Export('all_isa_list')
451
452# Define the universe of supported CPU models
453all_cpu_list = [ ]
454default_cpus = [ ]
455Export('all_cpu_list', 'default_cpus')
456
457# Sticky options get saved in the options file so they persist from
458# one invocation to the next (unless overridden, in which case the new
459# value becomes sticky).
460sticky_opts = Options(args=ARGUMENTS)
461Export('sticky_opts')
462
463# Non-sticky options only apply to the current build.
464nonsticky_opts = Options(args=ARGUMENTS)
465Export('nonsticky_opts')
466
467# Walk the tree and execute all SConsopts scripts that wil add to the
468# above options
469for root, dirs, files in os.walk('.'):
470    if 'SConsopts' in files:
471        SConscript(os.path.join(root, 'SConsopts'))
472
473all_isa_list.sort()
474all_cpu_list.sort()
475default_cpus.sort()
476
477def PathListMakeAbsolute(val):
478    if not val:
479        return val
480    f = lambda p: os.path.abspath(os.path.expanduser(p))
481    return ':'.join(map(f, val.split(':')))
482
483def PathListAllExist(key, val, env):
484    if not val:
485        return
486    paths = val.split(':')
487    for path in paths:
488        if not isdir(path):
489            raise SCons.Errors.UserError("Path does not exist: '%s'" % path)
490
491sticky_opts.AddOptions(
492    EnumOption('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
493    BoolOption('FULL_SYSTEM', 'Full-system support', False),
494    # There's a bug in scons 0.96.1 that causes ListOptions with list
495    # values (more than one value) not to be able to be restored from
496    # a saved option file.  If this causes trouble then upgrade to
497    # scons 0.96.90 or later.
498    ListOption('CPU_MODELS', 'CPU models', default_cpus, all_cpu_list),
499    BoolOption('NO_FAST_ALLOC', 'Disable fast object allocator', False),
500    BoolOption('EFENCE', 'Link with Electric Fence malloc debugger',
501               False),
502    BoolOption('SS_COMPATIBLE_FP',
503               'Make floating-point results compatible with SimpleScalar',
504               False),
505    BoolOption('USE_SSE2',
506               'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
507               False),
508    BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
509    BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
510    BoolOption('USE_CHECKER', 'Use checker for detailed CPU models', False),
511    ('CC', 'C compiler', os.environ.get('CC', env['CC'])),
512    ('CXX', 'C++ compiler', os.environ.get('CXX', env['CXX'])),
513    BoolOption('BATCH', 'Use batch pool for build and tests', False),
514    ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
515    ('PYTHONHOME',
516     'Override the default PYTHONHOME for this system (use with caution)',
517     '%s:%s' % (sys.prefix, sys.exec_prefix)),
518    ('EXTRAS', 'Add Extra directories to the compilation', '',
519     PathListAllExist, PathListMakeAbsolute)
520    )
521
522nonsticky_opts.AddOptions(
523    BoolOption('update_ref', 'Update test reference outputs', False)
524    )
525
526# These options get exported to #defines in config/*.hh (see src/SConscript).
527env.ExportOptions = ['FULL_SYSTEM', 'ALPHA_TLASER', 'USE_FENV', \
528                     'USE_MYSQL', 'NO_FAST_ALLOC', 'SS_COMPATIBLE_FP', \
529                     'USE_CHECKER', 'PYTHONHOME', 'TARGET_ISA']
530
531# Define a handy 'no-op' action
532def no_action(target, source, env):
533    return 0
534
535env.NoAction = Action(no_action, None)
536
537###################################################
538#
539# Define a SCons builder for configuration flag headers.
540#
541###################################################
542
543# This function generates a config header file that #defines the
544# option symbol to the current option setting (0 or 1).  The source
545# operands are the name of the option and a Value node containing the
546# value of the option.
547def build_config_file(target, source, env):
548    (option, value) = [s.get_contents() for s in source]
549    f = file(str(target[0]), 'w')
550    print >> f, '#define', option, value
551    f.close()
552    return None
553
554# Generate the message to be printed when building the config file.
555def build_config_file_string(target, source, env):
556    (option, value) = [s.get_contents() for s in source]
557    return "Defining %s as %s in %s." % (option, value, target[0])
558
559# Combine the two functions into a scons Action object.
560config_action = Action(build_config_file, build_config_file_string)
561
562# The emitter munges the source & target node lists to reflect what
563# we're really doing.
564def config_emitter(target, source, env):
565    # extract option name from Builder arg
566    option = str(target[0])
567    # True target is config header file
568    target = joinpath('config', option.lower() + '.hh')
569    val = env[option]
570    if isinstance(val, bool):
571        # Force value to 0/1
572        val = int(val)
573    elif isinstance(val, str):
574        val = '"' + val + '"'
575
576    # Sources are option name & value (packaged in SCons Value nodes)
577    return ([target], [Value(option), Value(val)])
578
579config_builder = Builder(emitter = config_emitter, action = config_action)
580
581env.Append(BUILDERS = { 'ConfigFile' : config_builder })
582
583###################################################
584#
585# Define a SCons builder for copying files.  This is used by the
586# Python zipfile code in src/python/SConscript, but is placed up here
587# since it's potentially more generally applicable.
588#
589###################################################
590
591copy_builder = Builder(action = Copy("$TARGET", "$SOURCE"))
592
593env.Append(BUILDERS = { 'CopyFile' : copy_builder })
594
595###################################################
596#
597# Define a simple SCons builder to concatenate files.
598#
599# Used to append the Python zip archive to the executable.
600#
601###################################################
602
603concat_builder = Builder(action = Action(['cat $SOURCES > $TARGET',
604                                          'chmod +x $TARGET']))
605
606env.Append(BUILDERS = { 'Concat' : concat_builder })
607
608
609# base help text
610help_text = '''
611Usage: scons [scons options] [build options] [target(s)]
612
613'''
614
615# libelf build is shared across all configs in the build root.
616env.SConscript('ext/libelf/SConscript',
617               build_dir = joinpath(build_root, 'libelf'),
618               exports = 'env')
619
620###################################################
621#
622# This function is used to set up a directory with switching headers
623#
624###################################################
625
626env['ALL_ISA_LIST'] = all_isa_list
627def make_switching_dir(dirname, switch_headers, env):
628    # Generate the header.  target[0] is the full path of the output
629    # header to generate.  'source' is a dummy variable, since we get the
630    # list of ISAs from env['ALL_ISA_LIST'].
631    def gen_switch_hdr(target, source, env):
632        fname = str(target[0])
633        basename = os.path.basename(fname)
634        f = open(fname, 'w')
635        f.write('#include "arch/isa_specific.hh"\n')
636        cond = '#if'
637        for isa in all_isa_list:
638            f.write('%s THE_ISA == %s_ISA\n#include "%s/%s/%s"\n'
639                    % (cond, isa.upper(), dirname, isa, basename))
640            cond = '#elif'
641        f.write('#else\n#error "THE_ISA not set"\n#endif\n')
642        f.close()
643        return 0
644
645    # String to print when generating header
646    def gen_switch_hdr_string(target, source, env):
647        return "Generating switch header " + str(target[0])
648
649    # Build SCons Action object. 'varlist' specifies env vars that this
650    # action depends on; when env['ALL_ISA_LIST'] changes these actions
651    # should get re-executed.
652    switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
653                               varlist=['ALL_ISA_LIST'])
654
655    # Instantiate actions for each header
656    for hdr in switch_headers:
657        env.Command(hdr, [], switch_hdr_action)
658Export('make_switching_dir')
659
660###################################################
661#
662# Define build environments for selected configurations.
663#
664###################################################
665
666# rename base env
667base_env = env
668
669for build_path in build_paths:
670    print "Building in", build_path
671    env['BUILDDIR'] = build_path
672
673    # build_dir is the tail component of build path, and is used to
674    # determine the build parameters (e.g., 'ALPHA_SE')
675    (build_root, build_dir) = os.path.split(build_path)
676    # Make a copy of the build-root environment to use for this config.
677    env = base_env.Copy()
678
679    # Set env options according to the build directory config.
680    sticky_opts.files = []
681    # Options for $BUILD_ROOT/$BUILD_DIR are stored in
682    # $BUILD_ROOT/options/$BUILD_DIR so you can nuke
683    # $BUILD_ROOT/$BUILD_DIR without losing your options settings.
684    current_opts_file = joinpath(build_root, 'options', build_dir)
685    if os.path.isfile(current_opts_file):
686        sticky_opts.files.append(current_opts_file)
687        print "Using saved options file %s" % current_opts_file
688    else:
689        # Build dir-specific options file doesn't exist.
690
691        # Make sure the directory is there so we can create it later
692        opt_dir = os.path.dirname(current_opts_file)
693        if not os.path.isdir(opt_dir):
694            os.mkdir(opt_dir)
695
696        # Get default build options from source tree.  Options are
697        # normally determined by name of $BUILD_DIR, but can be
698        # overriden by 'default=' arg on command line.
699        default_opts_file = joinpath('build_opts',
700                                     ARGUMENTS.get('default', build_dir))
701        if os.path.isfile(default_opts_file):
702            sticky_opts.files.append(default_opts_file)
703            print "Options file %s not found,\n  using defaults in %s" \
704                  % (current_opts_file, default_opts_file)
705        else:
706            print "Error: cannot find options file %s or %s" \
707                  % (current_opts_file, default_opts_file)
708            Exit(1)
709
710    # Apply current option settings to env
711    sticky_opts.Update(env)
712    nonsticky_opts.Update(env)
713
714    help_text += "Sticky options for %s:\n" % build_dir \
715                 + sticky_opts.GenerateHelpText(env) \
716                 + "\nNon-sticky options for %s:\n" % build_dir \
717                 + nonsticky_opts.GenerateHelpText(env)
718
719    # Process option settings.
720
721    if not have_fenv and env['USE_FENV']:
722        print "Warning: <fenv.h> not available; " \
723              "forcing USE_FENV to False in", build_dir + "."
724        env['USE_FENV'] = False
725
726    if not env['USE_FENV']:
727        print "Warning: No IEEE FP rounding mode control in", build_dir + "."
728        print "         FP results may deviate slightly from other platforms."
729
730    if env['EFENCE']:
731        env.Append(LIBS=['efence'])
732
733    if env['USE_MYSQL']:
734        if not have_mysql:
735            print "Warning: MySQL not available; " \
736                  "forcing USE_MYSQL to False in", build_dir + "."
737            env['USE_MYSQL'] = False
738        else:
739            print "Compiling in", build_dir, "with MySQL support."
740            env.ParseConfig(mysql_config_libs)
741            env.ParseConfig(mysql_config_include)
742
743    # Save sticky option settings back to current options file
744    sticky_opts.Save(current_opts_file, env)
745
746    # Do this after we save setting back, or else we'll tack on an
747    # extra 'qdo' every time we run scons.
748    if env['BATCH']:
749        env['CC']  = env['BATCH_CMD'] + ' ' + env['CC']
750        env['CXX'] = env['BATCH_CMD'] + ' ' + env['CXX']
751
752    if env['USE_SSE2']:
753        env.Append(CCFLAGS='-msse2')
754
755    # The src/SConscript file sets up the build rules in 'env' according
756    # to the configured options.  It returns a list of environments,
757    # one for each variant build (debug, opt, etc.)
758    envList = SConscript('src/SConscript', build_dir = build_path,
759                         exports = 'env')
760
761    # Set up the regression tests for each build.
762    for e in envList:
763        SConscript('tests/SConscript',
764                   build_dir = joinpath(build_path, 'tests', e.Label),
765                   exports = { 'env' : e }, duplicate = False)
766
767Help(help_text)
768
769
770###################################################
771#
772# Let SCons do its thing.  At this point SCons will use the defined
773# build environments to build the requested targets.
774#
775###################################################
776
777