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# Copyright The SCons Foundation
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"""SCons.Tool.gnulink

Tool-specific initialization for the gnu linker.

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.

"""

import SCons.Tool.linkCommon
import SCons.Util
import SCons.Tool

from . import link


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

    if env['PLATFORM'] == 'hpux':
        env['SHLINKFLAGS'] = SCons.Util.CLVar('$LINKFLAGS -shared -fPIC')

    # __RPATH is set to $_RPATH in the platform specification if that
    # platform supports it.
    env['RPATHPREFIX'] = '-Wl,-rpath='
    env['RPATHSUFFIX'] = ''
    env['_RPATH'] = '${_concat(RPATHPREFIX, RPATH, RPATHSUFFIX, __env__)}'


def exists(env):
    # TODO: sync with link.smart_link() to choose a linker
    linkers = {'CXX': ['g++'], 'CC': ['gcc']}
    alltools = []
    for langvar, linktools in linkers.items():
        if langvar in env:  # use CC over CXX when user specified CC but not CXX
            return SCons.Tool.FindTool(linktools, env)
        alltools.extend(linktools)
    return SCons.Tool.FindTool(alltools, env)  # find CXX or CC

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