gem5/build/SConstruct

# -*- mode:python -*-

# Copyright (c) 2004-2005 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

###################################################
#
# SCons top-level build description (SConstruct) file.
#
# To build M5, you need a directory with three things:
# 1. A copy of this file (named SConstruct).
# 2. A link named 'm5' to the top of the M5 simulator source tree.
# 3. A link named 'ext' to the top of the M5 external source tree.
#
# Then type 'scons' to build the default configuration (see below), or
# 'scons <CONFIG>/<binary>' to build some other configuration (e.g.,
# 'ALPHA_FS/m5.opt' for the optimized full-system version).
#
###################################################

# Python library imports
import sys
import os

# Check for recent-enough Python and SCons versions
EnsurePythonVersion(2,3)
EnsureSConsVersion(0,96)

# The absolute path to the current directory (where this file lives).
ROOT = Dir('.').abspath

# Paths to the M5 and external source trees (local symlinks).
SRCDIR = os.path.join(ROOT, 'm5')
EXT_SRCDIR = os.path.join(ROOT, 'ext')

# Check for 'm5' and 'ext' links, die if they don't exist.
if not os.path.isdir(SRCDIR):
    print "Error: '%s' must be a link to the M5 source tree." % SRCDIR
    Exit(1)

if not os.path.isdir('ext'):
    print "Error: '%s' must be a link to the M5 external source tree." \
          % EXT_SRCDIR
    Exit(1)

# tell python where to find m5 python code
sys.path.append(os.path.join(SRCDIR, 'python'))

###################################################
#
# Figure out which configurations to set up.
#
#
# It's prohibitive to do all the combinations of base configurations
# and options, so we have to infer which ones the user wants.
#
# 1. If there are command-line targets, the configuration(s) are inferred
#    from the directories of those targets.  If scons was invoked from a
#    subdirectory (using 'scons -u'), those targets have to be
#    interpreted relative to that subdirectory.
#
# 2. If there are no command-line targets, and scons was invoked from a
#    subdirectory (using 'scons -u'), the configuration is inferred from
#    the name of the subdirectory.
#
# 3. If there are no command-line targets and scons was invoked from
#    the root build directory, a default configuration is used.  The
#    built-in default is ALPHA_SE, but this can be overridden by setting the
#    M5_DEFAULT_CONFIG shell environment veriable.
#
# In cases 2 & 3, the specific file target defaults to 'm5.debug', but
# this can be overridden by setting the M5_DEFAULT_BINARY shell
# environment veriable.
#
###################################################

# Find default configuration & binary.
default_config = os.environ.get('M5_DEFAULT_CONFIG', 'ALPHA_SE')
default_binary = os.environ.get('M5_DEFAULT_BINARY', 'm5.debug')

# Ask SCons which directory it was invoked from.  If you invoke SCons
# from a subdirectory you must use the '-u' flag.
launch_dir = GetLaunchDir()

# Build a list 'my_targets' of all the targets relative to ROOT.
if launch_dir == ROOT:
    # invoked from root build dir
    if len(COMMAND_LINE_TARGETS) != 0:
        # easy: use specified targets as is
        my_targets = COMMAND_LINE_TARGETS
    else:
        # default target (ALPHA_SE/m5.debug, unless overridden)
        target = os.path.join(default_config, default_binary)
        my_targets = [target]
        Default(target)
else:
    # invoked from subdirectory
    if not launch_dir.startswith(ROOT):
        print "Error: launch dir (%s) not a subdirectory of ROOT (%s)!" \
              (launch_dir, ROOT)
        Exit(1)
    # make launch_dir relative to ROOT (strip ROOT plus slash off front)
    launch_dir = launch_dir[len(ROOT)+1:]
    if len(COMMAND_LINE_TARGETS) != 0:
        # make specified targets relative to ROOT
        my_targets = map(lambda x: os.path.join(launch_dir, x),
                         COMMAND_LINE_TARGETS)
    else:
        # build default binary (m5.debug, unless overridden) using the
        # config inferred by the invocation directory (the first
        # subdirectory after ROOT)
        target = os.path.join(launch_dir.split('/')[0], default_binary)
        my_targets = [target]
        Default(target)

# Normalize target paths (gets rid of '..' in the middle, etc.)
my_targets = map(os.path.normpath, my_targets)

# Generate a list of the unique configs that the collected targets reference.
build_dirs = []
for t in my_targets:
    dir = t.split('/')[0]
    if dir not in build_dirs:
        build_dirs.append(dir)

# Make a first pass to verify that build dirs are valid
for build_dir in build_dirs:
    if not os.path.isdir(build_dir):
        print "Error: build directory", build_dir, "does not exist."
        Exit(1)

###################################################
#
# Set up the default build environment.  This environment is copied
# and modified according to each selected configuration.
#
###################################################

env = Environment(ENV = os.environ,  # inherit user's environment vars
                  ROOT = ROOT,
                  SRCDIR = SRCDIR,
                  EXT_SRCDIR = EXT_SRCDIR)

env.SConsignFile("sconsign")

if os.environ.has_key('CC'):
    env.Replace(CC=os.environ['CC'])

if os.environ.has_key('CXX'):
    env.Replace(CXX=os.environ['CXX'])

# M5_EXT is used by isa_parser.py to find the PLY package.
env.Append(ENV = { 'M5_EXT' : EXT_SRCDIR })

# Set up default C++ compiler flags
env.Append(CCFLAGS='-pipe')
env.Append(CCFLAGS='-fno-strict-aliasing')
env.Append(CCFLAGS=Split('-Wall -Wno-sign-compare -Werror -Wundef'))
if sys.platform == 'cygwin':
    # cygwin has some header file issues...
    env.Append(CCFLAGS=Split("-Wno-uninitialized"))
env.Append(CPPPATH=[os.path.join(EXT_SRCDIR + '/dnet')])

# Default libraries
env.Append(LIBS=['z'])

# Platform-specific configuration
conf = Configure(env)

# Check for <fenv.h> (C99 FP environment control)
have_fenv = conf.CheckHeader('fenv.h', '<>')
if not have_fenv:
    print "Warning: Header file <fenv.h> not found."
    print "         This host has no IEEE FP rounding mode control."

# Check for mysql
mysql_config = WhereIs('mysql_config')
have_mysql = mysql_config != None

env = conf.Finish()

# The source operand is a Value node containing the value of the option.
def build_config_file(target, source, env, option):
    f = file(str(target[0]), 'w')
    print >> f, '#define', option, source[0]
    f.close()
    return None

def config_builder(env, option):
    target = os.path.join('config', option.lower() + '.hh')
    source = Value(env[option])
    def my_build_config_file(target, source, env):
        build_config_file(target, source, env, option)
    env.Command(target, source, my_build_config_file)

env.Append(BUILDERS = { 'ConfigFile' : config_builder })

# libelf build is described in its own SConscript file.
# SConscript-global is the build in build/libelf shared among all
# configs.
env.SConscript('m5/libelf/SConscript-global', exports = 'env')

###################################################
#
# Define build environments for selected configurations.
#
###################################################

# rename base env
base_env = env

for build_dir in build_dirs:
    # Make a copy of the default environment to use for this config.
    env = base_env.Copy()
    # Set env according to the build directory config.
    options_file = os.path.join(build_dir, 'build_options')
    opts = Options(options_file, ARGUMENTS)
    opts.AddOptions(
        EnumOption('TARGET_ISA', 'Target ISA', 'alpha', ('alpha')),
        BoolOption('FULL_SYSTEM', 'Full-system support', False),
        BoolOption('ALPHA_TLASER',
                   'Model Alpha TurboLaser platform (vs. Tsunami)', False),
        BoolOption('NO_FAST_ALLOC', 'Disable fast object allocator', False),
        BoolOption('EFENCE', 'Link with Electric Fence malloc debugger',
                   False),
        BoolOption('SS_COMPATIBLE_FP',
                   'Make floating-point results compatible with SimpleScalar',
                   False),
        BoolOption('STATS_BINNING', 'Bin statistics by CPU mode', have_mysql),
        BoolOption('USE_MYSQL', 'Use MySQL for stats output', have_mysql),
        BoolOption('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv)
        )

    opts.Update(env)
    opts.Save(options_file, env)

    env.ExportOptions = ['FULL_SYSTEM', 'ALPHA_TLASER', 'USE_FENV', \
                         'USE_MYSQL', 'NO_FAST_ALLOC', 'SS_COMPATIBLE_FP', \
                         'STATS_BINNING']

    # Process option settings.

    if not have_fenv and env['USE_FENV']:
        print "Warning: <fenv.h> not available; " \
              "forcing USE_FENV to False in", build_dir + "."
        env['USE_FENV'] = False

    if not env['USE_FENV']:
        print "Warning: No IEEE FP rounding mode control in", build_dir + "."
        print "         FP results may deviate slightly", \
              "and some regression tests may fail."

    if env['EFENCE']:
        env.Append(LIBS=['efence'])

    if env['USE_MYSQL']:
        if not have_mysql:
            print "Warning: MySQL not available; " \
                  "forcing USE_MYSQL to False in", build_dir + "."
            env['USE_MYSQL'] = False
        else:
            print "Compiling in", build_dir, "with MySQL support."
            env.ParseConfig(mysql_config + ' --libs')
            env.ParseConfig(mysql_config + ' --include')
    
    # The m5/SConscript file sets up the build rules in 'env' according
    # to the configured options.
    SConscript('m5/SConscript', build_dir = build_dir, exports = 'env',
               duplicate=0)

###################################################
#
# Let SCons do its thing.  At this point SCons will use the defined
# build environments to build the requested targets.
#
###################################################