SConstruct revision 3036
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
67import sys
68import 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]".
76EnsurePythonVersion(2,4)
77
78# Ironically, SCons 0.96 dies if you give EnsureSconsVersion a
79# 3-element version number.
80min_scons_version = (0,96,91)
81try:
82    EnsureSConsVersion(*min_scons_version)
83except:
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).
90ROOT = Dir('.').abspath
91
92# Paths to the M5 and external source trees.
93SRCDIR = os.path.join(ROOT, 'src')
94
95# tell python where to find m5 python code
96sys.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.
106Default(os.environ.get('M5_DEFAULT_BINARY', 'build/ALPHA_SE/m5.debug'))
107
108# Ask SCons which directory it was invoked from.
109launch_dir = GetLaunchDir()
110
111# Make targets relative to invocation directory
112abs_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
116def 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# Each target must have 'build' in the interior of the path; the
123# directory below this will determine the build parameters.  For
124# example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
125# recognize that ALPHA_SE specifies the configuration because it
126# follow 'build' in the bulid path.
127
128# Generate a list of the unique build roots and configs that the
129# collected targets reference.
130build_paths = []
131build_root = None
132for t in abs_targets:
133    path_dirs = t.split('/')
134    try:
135        build_top = rfind(path_dirs, 'build', -2)
136    except:
137        print "Error: no non-leaf 'build' dir found on target path", t
138        Exit(1)
139    this_build_root = os.path.join('/',*path_dirs[:build_top+1])
140    if not build_root:
141        build_root = this_build_root
142    else:
143        if this_build_root != build_root:
144            print "Error: build targets not under same build root\n"\
145                  "  %s\n  %s" % (build_root, this_build_root)
146            Exit(1)
147    build_path = os.path.join('/',*path_dirs[:build_top+2])
148    if build_path not in build_paths:
149        build_paths.append(build_path)
150
151###################################################
152#
153# Set up the default build environment.  This environment is copied
154# and modified according to each selected configuration.
155#
156###################################################
157
158env = Environment(ENV = os.environ,  # inherit user's environment vars
159                  ROOT = ROOT,
160                  SRCDIR = SRCDIR)
161
162env.SConsignFile(os.path.join(build_root,"sconsign"))
163
164# Default duplicate option is to use hard links, but this messes up
165# when you use emacs to edit a file in the target dir, as emacs moves
166# file to file~ then copies to file, breaking the link.  Symbolic
167# (soft) links work better.
168env.SetOption('duplicate', 'soft-copy')
169
170# I waffle on this setting... it does avoid a few painful but
171# unnecessary builds, but it also seems to make trivial builds take
172# noticeably longer.
173if False:
174    env.TargetSignatures('content')
175
176# M5_PLY is used by isa_parser.py to find the PLY package.
177env.Append(ENV = { 'M5_PLY' : Dir('ext/ply') })
178
179# Set up default C++ compiler flags
180env.Append(CCFLAGS='-pipe')
181env.Append(CCFLAGS='-fno-strict-aliasing')
182env.Append(CCFLAGS=Split('-Wall -Wno-sign-compare -Werror -Wundef'))
183if sys.platform == 'cygwin':
184    # cygwin has some header file issues...
185    env.Append(CCFLAGS=Split("-Wno-uninitialized"))
186env.Append(CPPPATH=[Dir('ext/dnet')])
187
188# Find Python include and library directories for embedding the
189# interpreter.  For consistency, we will use the same Python
190# installation used to run scons (and thus this script).  If you want
191# to link in an alternate version, see above for instructions on how
192# to invoke scons with a different copy of the Python interpreter.
193
194# Get brief Python version name (e.g., "python2.4") for locating
195# include & library files
196py_version_name = 'python' + sys.version[:3]
197
198# include path, e.g. /usr/local/include/python2.4
199env.Append(CPPPATH = os.path.join(sys.exec_prefix, 'include', py_version_name))
200env.Append(LIBS = py_version_name)
201# add library path too if it's not in the default place
202if sys.exec_prefix != '/usr':
203    env.Append(LIBPATH = os.path.join(sys.exec_prefix, 'lib'))
204
205# Set up SWIG flags & scanner
206
207env.Append(SWIGFLAGS=Split('-c++ -python -modern $_CPPINCFLAGS'))
208
209import SCons.Scanner
210
211swig_inc_re = '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
212
213swig_scanner = SCons.Scanner.ClassicCPP("SwigScan", ".i", "CPPPATH",
214                                        swig_inc_re)
215
216env.Append(SCANNERS = swig_scanner)
217
218# Other default libraries
219env.Append(LIBS=['z'])
220
221# Platform-specific configuration.  Note again that we assume that all
222# builds under a given build root run on the same host platform.
223conf = Configure(env,
224                 conf_dir = os.path.join(build_root, '.scons_config'),
225                 log_file = os.path.join(build_root, 'scons_config.log'))
226
227# Check for <fenv.h> (C99 FP environment control)
228have_fenv = conf.CheckHeader('fenv.h', '<>')
229if not have_fenv:
230    print "Warning: Header file <fenv.h> not found."
231    print "         This host has no IEEE FP rounding mode control."
232
233# Check for mysql.
234mysql_config = WhereIs('mysql_config')
235have_mysql = mysql_config != None
236
237# Check MySQL version.
238if have_mysql:
239    mysql_version = os.popen(mysql_config + ' --version').read()
240    mysql_version = mysql_version.split('.')
241    mysql_major = int(mysql_version[0])
242    mysql_minor = int(mysql_version[1])
243    # This version check is probably overly conservative, but it deals
244    # with the versions we have installed.
245    if mysql_major < 4 or (mysql_major == 4 and mysql_minor < 1):
246        print "Warning: MySQL v4.1 or newer required."
247        have_mysql = False
248
249# Set up mysql_config commands.
250if have_mysql:
251    mysql_config_include = mysql_config + ' --include'
252    if os.system(mysql_config_include + ' > /dev/null') != 0:
253        # older mysql_config versions don't support --include, use
254        # --cflags instead
255        mysql_config_include = mysql_config + ' --cflags | sed s/\\\'//g'
256    # This seems to work in all versions
257    mysql_config_libs = mysql_config + ' --libs'
258
259env = conf.Finish()
260
261# Define the universe of supported ISAs
262env['ALL_ISA_LIST'] = ['alpha', 'sparc', 'mips']
263
264# Define the universe of supported CPU models
265env['ALL_CPU_LIST'] = ['AtomicSimpleCPU', 'TimingSimpleCPU',
266                       'FullCPU', 'O3CPU',
267                       'OzoneCPU']
268
269# Sticky options get saved in the options file so they persist from
270# one invocation to the next (unless overridden, in which case the new
271# value becomes sticky).
272sticky_opts = Options(args=ARGUMENTS)
273sticky_opts.AddOptions(
274    EnumOption('TARGET_ISA', 'Target ISA', 'alpha', env['ALL_ISA_LIST']),
275    BoolOption('FULL_SYSTEM', 'Full-system support', False),
276    # There's a bug in scons 0.96.1 that causes ListOptions with list
277    # values (more than one value) not to be able to be restored from
278    # a saved option file.  If this causes trouble then upgrade to
279    # scons 0.96.90 or later.
280    ListOption('CPU_MODELS', 'CPU models', 'AtomicSimpleCPU,TimingSimpleCPU',
281               env['ALL_CPU_LIST']),
282    BoolOption('ALPHA_TLASER',
283               'Model Alpha TurboLaser platform (vs. Tsunami)', False),
284    BoolOption('NO_FAST_ALLOC', 'Disable fast object allocator', False),
285    BoolOption('EFENCE', 'Link with Electric Fence malloc debugger',
286               False),
287    BoolOption('SS_COMPATIBLE_FP',
288               'Make floating-point results compatible with SimpleScalar',
289               False),
290    BoolOption('USE_SSE2',
291               'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
292               False),
293    BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
294    BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
295    BoolOption('USE_CHECKER', 'Use checker for detailed CPU models', False),
296    ('CC', 'C compiler', os.environ.get('CC', env['CC'])),
297    ('CXX', 'C++ compiler', os.environ.get('CXX', env['CXX'])),
298    BoolOption('BATCH', 'Use batch pool for build and tests', False),
299    ('BATCH_CMD', 'Batch pool submission command name', 'qdo')
300    )
301
302# Non-sticky options only apply to the current build.
303nonsticky_opts = Options(args=ARGUMENTS)
304nonsticky_opts.AddOptions(
305    ListOption('TEST_CPU_MODELS', 'CPU models to test if regression is being run', '',
306               env['ALL_CPU_LIST']),
307    BoolOption('update_ref', 'Update test reference outputs', False)
308    )
309
310# These options get exported to #defines in config/*.hh (see src/SConscript).
311env.ExportOptions = ['FULL_SYSTEM', 'ALPHA_TLASER', 'USE_FENV', \
312                     'USE_MYSQL', 'NO_FAST_ALLOC', 'SS_COMPATIBLE_FP', \
313                     'USE_CHECKER']
314
315# Define a handy 'no-op' action
316def no_action(target, source, env):
317    return 0
318
319env.NoAction = Action(no_action, None)
320
321###################################################
322#
323# Define a SCons builder for configuration flag headers.
324#
325###################################################
326
327# This function generates a config header file that #defines the
328# option symbol to the current option setting (0 or 1).  The source
329# operands are the name of the option and a Value node containing the
330# value of the option.
331def build_config_file(target, source, env):
332    (option, value) = [s.get_contents() for s in source]
333    f = file(str(target[0]), 'w')
334    print >> f, '#define', option, value
335    f.close()
336    return None
337
338# Generate the message to be printed when building the config file.
339def build_config_file_string(target, source, env):
340    (option, value) = [s.get_contents() for s in source]
341    return "Defining %s as %s in %s." % (option, value, target[0])
342
343# Combine the two functions into a scons Action object.
344config_action = Action(build_config_file, build_config_file_string)
345
346# The emitter munges the source & target node lists to reflect what
347# we're really doing.
348def config_emitter(target, source, env):
349    # extract option name from Builder arg
350    option = str(target[0])
351    # True target is config header file
352    target = os.path.join('config', option.lower() + '.hh')
353    # Force value to 0/1 even if it's a Python bool
354    val = int(eval(str(env[option])))
355    # Sources are option name & value (packaged in SCons Value nodes)
356    return ([target], [Value(option), Value(val)])
357
358config_builder = Builder(emitter = config_emitter, action = config_action)
359
360env.Append(BUILDERS = { 'ConfigFile' : config_builder })
361
362###################################################
363#
364# Define a SCons builder for copying files.  This is used by the
365# Python zipfile code in src/python/SConscript, but is placed up here
366# since it's potentially more generally applicable.
367#
368###################################################
369
370copy_builder = Builder(action = Copy("$TARGET", "$SOURCE"))
371
372env.Append(BUILDERS = { 'CopyFile' : copy_builder })
373
374###################################################
375#
376# Define a simple SCons builder to concatenate files.
377#
378# Used to append the Python zip archive to the executable.
379#
380###################################################
381
382concat_builder = Builder(action = Action(['cat $SOURCES > $TARGET',
383                                          'chmod +x $TARGET']))
384
385env.Append(BUILDERS = { 'Concat' : concat_builder })
386
387
388# base help text
389help_text = '''
390Usage: scons [scons options] [build options] [target(s)]
391
392'''
393
394# libelf build is shared across all configs in the build root.
395env.SConscript('ext/libelf/SConscript',
396               build_dir = os.path.join(build_root, 'libelf'),
397               exports = 'env')
398
399###################################################
400#
401# Define build environments for selected configurations.
402#
403###################################################
404
405# rename base env
406base_env = env
407
408for build_path in build_paths:
409    print "Building in", build_path
410    # build_dir is the tail component of build path, and is used to
411    # determine the build parameters (e.g., 'ALPHA_SE')
412    (build_root, build_dir) = os.path.split(build_path)
413    # Make a copy of the build-root environment to use for this config.
414    env = base_env.Copy()
415
416    # Set env options according to the build directory config.
417    sticky_opts.files = []
418    # Options for $BUILD_ROOT/$BUILD_DIR are stored in
419    # $BUILD_ROOT/options/$BUILD_DIR so you can nuke
420    # $BUILD_ROOT/$BUILD_DIR without losing your options settings.
421    current_opts_file = os.path.join(build_root, 'options', build_dir)
422    if os.path.isfile(current_opts_file):
423        sticky_opts.files.append(current_opts_file)
424        print "Using saved options file %s" % current_opts_file
425    else:
426        # Build dir-specific options file doesn't exist.
427
428        # Make sure the directory is there so we can create it later
429        opt_dir = os.path.dirname(current_opts_file)
430        if not os.path.isdir(opt_dir):
431            os.mkdir(opt_dir)
432
433        # Get default build options from source tree.  Options are
434        # normally determined by name of $BUILD_DIR, but can be
435        # overriden by 'default=' arg on command line.
436        default_opts_file = os.path.join('build_opts',
437                                         ARGUMENTS.get('default', build_dir))
438        if os.path.isfile(default_opts_file):
439            sticky_opts.files.append(default_opts_file)
440            print "Options file %s not found,\n  using defaults in %s" \
441                  % (current_opts_file, default_opts_file)
442        else:
443            print "Error: cannot find options file %s or %s" \
444                  % (current_opts_file, default_opts_file)
445            Exit(1)
446
447    # Apply current option settings to env
448    sticky_opts.Update(env)
449    nonsticky_opts.Update(env)
450
451    help_text += "Sticky options for %s:\n" % build_dir \
452                 + sticky_opts.GenerateHelpText(env) \
453                 + "\nNon-sticky options for %s:\n" % build_dir \
454                 + nonsticky_opts.GenerateHelpText(env)
455
456    # Process option settings.
457
458    if not have_fenv and env['USE_FENV']:
459        print "Warning: <fenv.h> not available; " \
460              "forcing USE_FENV to False in", build_dir + "."
461        env['USE_FENV'] = False
462
463    if not env['USE_FENV']:
464        print "Warning: No IEEE FP rounding mode control in", build_dir + "."
465        print "         FP results may deviate slightly from other platforms."
466
467    if env['EFENCE']:
468        env.Append(LIBS=['efence'])
469
470    if env['USE_MYSQL']:
471        if not have_mysql:
472            print "Warning: MySQL not available; " \
473                  "forcing USE_MYSQL to False in", build_dir + "."
474            env['USE_MYSQL'] = False
475        else:
476            print "Compiling in", build_dir, "with MySQL support."
477            env.ParseConfig(mysql_config_libs)
478            env.ParseConfig(mysql_config_include)
479
480    # Save sticky option settings back to current options file
481    sticky_opts.Save(current_opts_file, env)
482
483    # Do this after we save setting back, or else we'll tack on an
484    # extra 'qdo' every time we run scons.
485    if env['BATCH']:
486        env['CC']  = env['BATCH_CMD'] + ' ' + env['CC']
487        env['CXX'] = env['BATCH_CMD'] + ' ' + env['CXX']
488
489    if env['USE_SSE2']:
490        env.Append(CCFLAGS='-msse2')
491
492    # The src/SConscript file sets up the build rules in 'env' according
493    # to the configured options.  It returns a list of environments,
494    # one for each variant build (debug, opt, etc.)
495    envList = SConscript('src/SConscript', build_dir = build_path,
496                         exports = 'env')
497
498    # Set up the regression tests for each build.
499    for e in envList:
500        SConscript('tests/SConscript',
501                   build_dir = os.path.join(build_path, 'tests', e.Label),
502                   exports = { 'env' : e }, duplicate = False)
503
504Help(help_text)
505
506###################################################
507#
508# Let SCons do its thing.  At this point SCons will use the defined
509# build environments to build the requested targets.
510#
511###################################################
512
513