"""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.

"""

#
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import SCons.Util
import SCons.Tool
import os
import sys
import re

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__)}'

    # OpenBSD doesn't usually use SONAME for libraries
    use_soname = not sys.platform.startswith('openbsd')
    link._setup_versioned_lib_variables(env, tool = 'gnulink', use_soname = use_soname)
    env['LINKCALLBACKS'] = link._versioned_lib_callbacks()

    # For backward-compatibility with older SCons versions
    env['SHLIBVERSIONFLAGS'] = SCons.Util.CLVar('-Wl,-Bsymbolic')
    
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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