"""SCons.Tool.gcc

Tool-specific initialization for gcc.

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.

"""

#
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# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
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# The above copyright notice and this permission notice shall be included
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__revision__ = "src/engine/SCons/Tool/gcc.py 5357 2011/09/09 21:31:03 bdeegan"

import cc
import os
import re
import subprocess

import SCons.Util

compilers = ['gcc', 'cc']

def generate(env):
    """Add Builders and construction variables for gcc to an Environment."""
    cc.generate(env)

    env['CC'] = env.Detect(compilers) or 'gcc'
    if env['PLATFORM'] in ['cygwin', 'win32']:
        env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS')
    else:
        env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS -fPIC')
    # determine compiler version
    if env['CC']:
        #pipe = SCons.Action._subproc(env, [env['CC'], '-dumpversion'],
        pipe = SCons.Action._subproc(env, [env['CC'], '--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['CCVERSION'] = line
        line = pipe.stdout.readline()
        match = re.search(r'[0-9]+(\.[0-9]+)+', line)
        if match:
            env['CCVERSION'] = match.group(0)

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

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