# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

from spack import *


class Knem(AutotoolsPackage):
    """KNEM is a Linux kernel module enabling high-performance intra-node MPI
    communication for large messages."""

    homepage = "https://knem.gforge.inria.fr"
    url = "https://gitlab.inria.fr/knem/knem/uploads/4a43e3eb860cda2bbd5bf5c7c04a24b6/knem-1.1.4.tar.gz"
    list_url = "https://knem.gitlabpages.inria.fr/download"
    git = "https://gitlab.inria.fr/knem/knem.git"

    maintainers = ['skosukhin']

    version('master', branch='master')
    version('1.1.4', sha256='9f0e360579ae7655e07d6644583fd325515e9ff2b42ef5decb5421a003510937',
            url="https://gitlab.inria.fr/knem/knem/uploads/4a43e3eb860cda2bbd5bf5c7c04a24b6/knem-1.1.4.tar.gz")
    version('1.1.3', sha256='50d3c4a20c140108b8ce47aaafd0ade0927d6f507e1b5cc690dd6bddeef30f60',
            url="https://gitlab.inria.fr/knem/knem/uploads/59375c38537e6ff2d94209f190c54aa6/knem-1.1.3.tar.gz")

    variant('hwloc', default=True,
            description='Enable hwloc in the user-space tools')

    patch('https://gitlab.inria.fr/knem/knem/-/commit/5c8cb902d6040df58cdc4e4e4c10d1f1426c3525.patch',
          sha256='78885a02d6f031a793db6a7190549f8d64c8606b353051d65f8e3f802b801902',
          when='@1.1.4')

    depends_on('hwloc',                   when='+hwloc')
    depends_on('pkgconfig', type='build', when='+hwloc')
    depends_on('autoconf',  type='build', when='@master')
    depends_on('automake',  type='build', when='@master')
    depends_on('m4',        type='build', when='@master')

    # The support for hwloc was added in 0.9.1:
    conflicts('+hwloc', when='@:0.9.0')

    # Ideally, we should list all non-Linux-based platforms here:
    conflicts('platform=darwin')

    # All compilers except for gcc are in conflict:
    for __compiler in spack.compilers.supported_compilers():
        if __compiler != 'gcc':
            conflicts('%{0}'.format(__compiler),
                      msg='Linux kernel module must be compiled with gcc')

    @run_before('build')
    def override_kernel_compiler(self):
        # Override the compiler for kernel module source files. We need
        # this additional argument for all installation phases.
        make.add_default_arg('CC={0}'.format(spack_cc))

    def configure_args(self):
        return self.enable_or_disable('hwloc')

    @when('@master')
    def autoreconf(self, spec, prefix):
        Executable('./autogen.sh')()