text: # Copyright 2013-2019 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 *
  import os
  
  
  class Flang(CMakePackage):
      """Flang is a Fortran compiler targeting LLVM."""
  
      homepage = "https://github.com/flang-compiler/flang"
  
      url      = "https://github.com/flang-compiler/flang/archive/flang_20180612.tar.gz"
      git      = "https://github.com/flang-compiler/flang.git"
  
      version('develop', branch='master')
      version('20180921', sha256='f33bd1f054e474f1e8a204bb6f78d42f8f6ecf7a894fdddc3999f7c272350784')
      version('20180612', sha256='6af858bea013548e091371a97726ac784edbd4ff876222575eaae48a3c2920ed')
  
      depends_on('llvm@flang-develop', when='@develop')
      depends_on('llvm@flang-20180921', when='@20180921 target=x86_64:')
      depends_on('llvm@flang-20180612', when='@20180612 target=x86_64:')
  
      depends_on('llvm@flang-20180921', when='@20180921 target=aarch64:')
  
      # LLVM version specific to OpenPOWER.
      depends_on('llvm@flang-ppc64le-20180921', when='@20180921 target=ppc64le:')
      depends_on('llvm@flang-ppc64le-20180612', when='@20180612 target=ppc64le:')
  
      depends_on('pgmath@develop', when='@develop')
      depends_on('pgmath@20180921', when='@20180921')
      depends_on('pgmath@20180612', when='@20180612')
  
      def cmake_args(self):
          options = [
              '-DWITH_WERROR=OFF',
              '-DCMAKE_C_COMPILER=%s' % os.path.join(
                  self.spec['llvm'].prefix.bin, 'clang'),
              '-DCMAKE_CXX_COMPILER=%s' % os.path.join(
                  self.spec['llvm'].prefix.bin, 'clang++'),
              '-DCMAKE_Fortran_COMPILER=%s' % os.path.join(
                  self.spec['llvm'].prefix.bin, 'flang'),
              '-DFLANG_LIBOMP=%s' % find_libraries(
                  'libomp', root=self.spec['llvm'].prefix.lib)
          ]
  
          return options
  
      @run_after('install')
      def post_install(self):
          # we are installing flang in a path different from llvm, so we
          # create a wrapper with -L for e.g. libflangrti.so and -I for
          # e.g. iso_c_binding.mod. -B is needed to help flang to find
          # flang1 and flang2. rpath_arg is needed so that executables
          # generated by flang can find libflang later.
          flang = os.path.join(self.spec.prefix.bin, 'flang')
          with open(flang, 'w') as out:
              out.write('#!/bin/bash\n')
              out.write(
                  '{0} -I{1} -L{2} -L{3} {4}{5} {6}{7} -B{8} "$@"\n'.format(
                      self.spec['llvm'].prefix.bin.flang,
                      self.prefix.include, self.prefix.lib,
                      self.spec['pgmath'].prefix.lib,
                      self.compiler.fc_rpath_arg, self.prefix.lib,
                      self.compiler.fc_rpath_arg,
                      self.spec['pgmath'].prefix.lib, self.spec.prefix.bin))
              out.close()
          chmod = which('chmod')
          chmod('+x', flang)
  
      def setup_build_environment(self, env):
          # to find llvm's libc++.so
          env.set('LD_LIBRARY_PATH', self.spec['llvm'].prefix.lib)
  
      def setup_run_environment(self, env):
          env.set('FC',  self.spec.prefix.bin.flang)
          env.set('F77', self.spec.prefix.bin.flang)
          env.set('F90', self.spec.prefix.bin.flang)
  