text: # Copyright 2013-2020 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)
  
  import re
  
  
  class M4(AutotoolsPackage, GNUMirrorPackage):
      """GNU M4 is an implementation of the traditional Unix macro processor."""
  
      homepage = "https://www.gnu.org/software/m4/m4.html"
      gnu_mirror_path = "m4/m4-1.4.18.tar.gz"
  
      version('1.4.18', sha256='ab2633921a5cd38e48797bf5521ad259bdc4b979078034a3b790d7fec5493fab')
      version('1.4.17', sha256='3ce725133ee552b8b4baca7837fb772940b25e81b2a9dc92537aeaf733538c9e')
  
      patch('gnulib-pgi.patch', when='@1.4.18')
      patch('pgi.patch', when='@1.4.17')
      patch('nvhpc.patch', when='%nvhpc')
      # from: https://github.com/Homebrew/homebrew-core/blob/master/Formula/m4.rb
      # Patch credit to Jeremy Huddleston Sequoia <jeremyhu@apple.com>
      patch('secure_snprintf.patch', when='os = highsierra')
      patch('secure_snprintf.patch', when='os = mojave')
      patch('secure_snprintf.patch', when='os = catalina')
      # https://bugzilla.redhat.com/show_bug.cgi?id=1573342
      patch('https://src.fedoraproject.org/rpms/m4/raw/5d147168d4b93f38a4833f5dd1d650ad88af5a8a/f/m4-1.4.18-glibc-change-work-around.patch', sha256='fc9b61654a3ba1a8d6cd78ce087e7c96366c290bc8d2c299f09828d793b853c8', when='@1.4.18')
  
      variant('sigsegv', default=True,
              description="Build the libsigsegv dependency")
  
      depends_on('libsigsegv', when='+sigsegv')
  
      build_directory = 'spack-build'
  
      executables = ['^g?m4$']
  
      @classmethod
      def determine_version(cls, exe):
          # Output on macOS:
          #   GNU M4 1.4.6
          # Output on Linux:
          #   m4 (GNU M4) 1.4.18
          output = Executable(exe)('--version', output=str, error=str)
          match = re.search(r'GNU M4\)?\s+(\S+)', output)
          return match.group(1) if match else None
  
      def configure_args(self):
          spec = self.spec
          args = ['--enable-c++']
  
          if spec.satisfies('%cce@9:'):
              args.append('LDFLAGS=-rtlib=compiler-rt')
  
          if spec.satisfies('%clang') and not spec.satisfies('platform=darwin'):
              args.append('LDFLAGS=-rtlib=compiler-rt')
  
          if spec.satisfies('%arm') and not spec.satisfies('platform=darwin'):
              args.append('LDFLAGS=-rtlib=compiler-rt')
  
          if spec.satisfies('%fj') and not spec.satisfies('platform=darwin'):
              args.append('LDFLAGS=-rtlib=compiler-rt')
  
          if spec.satisfies('%intel@:18.999'):
              args.append('CFLAGS=-no-gcc')
  
          if '+sigsegv' in spec:
              args.append('--with-libsigsegv-prefix={0}'.format(
                  spec['libsigsegv'].prefix))
          else:
              args.append('--without-libsigsegv-prefix')
  
          # http://lists.gnu.org/archive/html/bug-m4/2016-09/msg00002.html
          arch = spec.architecture
          if (arch.platform == 'darwin' and arch.os == 'sierra' and
                  '%gcc' in spec):
              args.append('ac_cv_type_struct_sched_param=yes')
  
          return args
  