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# Copyright 2013-2021 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 IntelLlvm(CMakePackage):
    """Intel's version of the LLVM compiler.
    """

    maintainers = ['rscohn2']

    homepage = 'https://github.com/intel/llvm'
    git = 'https://github.com/intel/llvm.git'

    family = 'compiler'

    version('sycl', branch='sycl')

    depends_on('cmake@3.4.3:', type='build')

    # It doesn't seem possible to use != in a conflicts statement
    # conflicts('target != x86_64',
    #            msg='Intel LLVM compiler currently only works for x86')

    def setup_build_environment(self, env):
        env.append_flags('CXXFLAGS', self.compiler.cxx11_flag)

    def setup_run_environment(self, env):
        if '+clang' in self.spec:
            env.set('CC', join_path(self.spec.prefix.bin, 'clang'))
            env.set('CXX', join_path(self.spec.prefix.bin, 'clang++'))

    root_cmakelists_dir = 'llvm'

    def cmake_args(self):

        cmake_args = []

        cmake_args.extend([
            '-DLLVM_TARGETS_TO_BUILD=X86',
            '-DLLVM_EXTERNAL_PROJECTS=llvm-spirv;sycl',
            '-DLLVM_ENABLE_PROJECTS=clang;llvm-spirv;sycl',
            '-DLLVM_EXTERNAL_SYCL_SOURCE_DIR={0}'.format(
                join_path(self.stage.source_path, 'sycl')),
            '-DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR={0}'.format(
                join_path(self.stage.source_path, 'llvm-spirv')),
        ])

        return cmake_args