"""SCons.Tool.g++

Tool-specific initialization for g++.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

"""

#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
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# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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#

__revision__ = "src/engine/SCons/Tool/g++.py 5023 2010/06/14 22:05:46 scons"

import os.path
import re
import subprocess

import SCons.Tool
import SCons.Util

cplusplus = __import__('c++', globals(), locals(), [])

compilers = ['g++']

def generate(env):
    """Add Builders and construction variables for g++ to an Environment."""
    static_obj, shared_obj = SCons.Tool.createObjBuilders(env)

    cplusplus.generate(env)

    env['CXX']        = env.Detect(compilers)

    # platform specific settings
    if env['PLATFORM'] == 'aix':
        env['SHCXXFLAGS'] = SCons.Util.CLVar('$CXXFLAGS -mminimal-toc')
        env['STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME'] = 1
        env['SHOBJSUFFIX'] = '$OBJSUFFIX'
    elif env['PLATFORM'] == 'hpux':
        env['SHOBJSUFFIX'] = '.pic.o'
    elif env['PLATFORM'] == 'sunos':
        env['SHOBJSUFFIX'] = '.pic.o'
    # determine compiler version
    if env['CXX']:
        #pipe = SCons.Action._subproc(env, [env['CXX'], '-dumpversion'],
        pipe = SCons.Action._subproc(env, [env['CXX'], '--version'],
                                     stdin = 'devnull',
                                     stderr = 'devnull',
                                     stdout = subprocess.PIPE)
        if pipe.wait() != 0: return
        # -dumpversion was added in GCC 3.0.  As long as we're supporting
        # GCC versions older than that, we should use --version and a
        # regular expression.
        #line = pipe.stdout.read().strip()
        #if line:
        #    env['CXXVERSION'] = line
        line = pipe.stdout.readline()
        match = re.search(r'[0-9]+(\.[0-9]+)+', line)
        if match:
            env['CXXVERSION'] = match.group(0)

def exists(env):
    return env.Detect(compilers)

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