# MIT License
#
# Copyright The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# 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
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""Platform-specific initialization for IBM AIX systems.

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

import subprocess

from . import posix

import SCons.Util
import SCons.Action

def get_xlc(env, xlc=None, packages=[]):
    # Use the AIX package installer tool lslpp to figure out where a
    # given xl* compiler is installed and what version it is.
    xlcPath = None
    xlcVersion = None

    if xlc is None:
        xlc = env.get('CC', 'xlc')
    if SCons.Util.is_List(xlc):
        xlc = xlc[0]
    for package in packages:
        # find the installed filename, which may be a symlink as well
        pipe = SCons.Action._subproc(env, ['lslpp', '-fc', package],
                stdin = 'devnull',
                stderr = 'devnull',
                universal_newlines=True,
                stdout = subprocess.PIPE)
        # output of lslpp is something like this:
        #     #Path:Fileset:File
        #     /usr/lib/objrepos:vac.C 6.0.0.0:/usr/vac/exe/xlCcpp
        #     /usr/lib/objrepos:vac.C 6.0.0.0:/usr/vac/bin/xlc_r -> /usr/vac/bin/xlc
        for line in pipe.stdout:
            if xlcPath:
                continue # read everything to let lslpp terminate
            fileset, filename = line.split(':')[1:3]
            filename = filename.split()[0]
            if ('/' in xlc and filename == xlc) \
            or ('/' not in xlc and filename.endswith('/' + xlc)):
                xlcVersion = fileset.split()[1]
                xlcPath, sep, xlc = filename.rpartition('/')
    return (xlcPath, xlc, xlcVersion)

def generate(env):
    posix.generate(env)
    #Based on AIX 5.2: ARG_MAX=24576 - 3000 for environment expansion
    env['MAXLINELENGTH']  = 21576
    env['SHLIBSUFFIX'] = '.a'
    env['HOST_OS'] = 'aix'

# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
