common.py


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#######################################################################
# Common SCons code

import os
import os.path
import re
import subprocess
import sys
import platform as _platform

import SCons.Script.SConscript


#######################################################################
# Defaults

host_platform = _platform.system().lower()
if host_platform.startswith('cygwin'):
    host_platform = 'cygwin'

# Search sys.argv[] for a "platform=foo" argument since we don't have
# an 'env' variable at this point.
if 'platform' in SCons.Script.ARGUMENTS:
    target_platform = SCons.Script.ARGUMENTS['platform']
else:
    target_platform = host_platform

_machine_map = {
    'x86': 'x86',
    'i386': 'x86',
    'i486': 'x86',
    'i586': 'x86',
    'i686': 'x86',
    'BePC': 'x86',
    'Intel': 'x86',
    'ppc': 'ppc',
    'BeBox': 'ppc',
    'BeMac': 'ppc',
    'AMD64': 'x86_64',
    'x86_64': 'x86_64',
    'sparc': 'sparc',
    'sun4u': 'sparc',
}


# find host_machine value
if 'PROCESSOR_ARCHITECTURE' in os.environ:
    host_machine = os.environ['PROCESSOR_ARCHITECTURE']
else:
    host_machine = _platform.machine()
host_machine = _machine_map.get(host_machine, 'generic')

default_machine = host_machine
default_toolchain = 'default'

if target_platform == 'windows' and host_platform != 'windows':
    default_machine = 'x86'
    default_toolchain = 'crossmingw'


# find default_llvm value
if 'LLVM' in os.environ:
    default_llvm = 'yes'
else:
    default_llvm = 'no'
    try:
        if target_platform != 'windows' and \
           subprocess.call(['llvm-config', '--version'],
                           stdout=subprocess.PIPE) == 0:
            default_llvm = 'yes'
    except:
        pass


#######################################################################
# Common options

def AddOptions(opts):
    try: