old_contents: ##############################################################################
  # Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
  # Produced at the Lawrence Livermore National Laboratory.
  #
  # This file is part of Spack.
  # Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
  # LLNL-CODE-647188
  #
  # For details, see https://github.com/llnl/spack
  # Please also see the LICENSE file for our notice and the LGPL.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU Lesser General Public License (as
  # published by the Free Software Foundation) version 2.1, February 1999.
  #
  # This program is distributed in the hope that it will be useful, but
  # WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
  # conditions of the GNU Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this program; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  ##############################################################################
  from spack import *
  import sys
  
  
  class Veclibfort(Package):
      """Lightweight but flexible shim designed to rectify the incompatibilities
      between the Accelerate/vecLib BLAS and LAPACK libraries shipped with macOS
      and FORTRAN code compiled with modern compilers such as GNU Fortran."""
  
      homepage = "https://github.com/mcg1969/vecLibFort"
      url      = "https://github.com/mcg1969/vecLibFort/archive/0.4.2.tar.gz"
  
      version('0.4.2', '83395ffcbe8a2122c3f726a5c3a7cf93')
      version('develop', git='https://github.com/mcg1969/vecLibFort.git')
  
      variant('shared', default=True,
              description="Build shared libraries as well as static libs.")
  
      # virtual dependency
      provides('blas')
      provides('lapack')
  
      @property
      def libs(self):
          shared = True if '+shared' in self.spec else False
          return find_libraries(
              'libvecLibFort', root=self.prefix, shared=shared, recurse=True
          )
  
      def install(self, spec, prefix):
          if sys.platform != 'darwin':
              raise InstallError('vecLibFort can be installed on macOS only')
  
          make('all')
          make('PREFIX=%s' % prefix, 'install')
  
          # test
          fc = which('fc')
          flags = ['-o', 'tester', '-O', 'tester.f90']
          flags.extend(spec['veclibfort'].libs.ld_flags.split())
          fc(*flags)
          Executable('./tester')()
  
new_contents: ##############################################################################
  # Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
  # Produced at the Lawrence Livermore National Laboratory.
  #
  # This file is part of Spack.
  # Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
  # LLNL-CODE-647188
  #
  # For details, see https://github.com/llnl/spack
  # Please also see the LICENSE file for our notice and the LGPL.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU Lesser General Public License (as
  # published by the Free Software Foundation) version 2.1, February 1999.
  #
  # This program is distributed in the hope that it will be useful, but
  # WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
  # conditions of the GNU Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this program; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  ##############################################################################
  from spack import *
  import sys
  
  
  class Veclibfort(Package):
      """Lightweight but flexible shim designed to rectify the incompatibilities
      between the Accelerate/vecLib BLAS and LAPACK libraries shipped with macOS
      and FORTRAN code compiled with modern compilers such as GNU Fortran."""
  
      homepage = "https://github.com/mcg1969/vecLibFort"
      url      = "https://github.com/mcg1969/vecLibFort/archive/0.4.2.tar.gz"
  
      version('0.4.2', '83395ffcbe8a2122c3f726a5c3a7cf93')
      version('develop', git='https://github.com/mcg1969/vecLibFort.git')
  
      variant('shared', default=True,
              description="Build shared libraries as well as static libs.")
  
      # virtual dependency
      provides('blas')
      provides('lapack')
  
      @property
      def libs(self):
          shared = True if '+shared' in self.spec else False
          return find_libraries(
              'libvecLibFort', root=self.prefix, shared=shared, recurse=True
          )
  
      def install(self, spec, prefix):
          if sys.platform != 'darwin':
              raise InstallError('vecLibFort can be installed on macOS only')
  
          filter_file(r'^PREFIX=.*', '', 'Makefile')
  
          make_args = []
  
          if spec.satisfies('%gcc@6:'):
              make_args += ['CFLAGS=-flax-vector-conversions']
  
          make_args += ['PREFIX=%s' % prefix, 'install']
  
          make(*make_args)
  
          # test
          fc = which('fc')
          flags = ['-o', 'tester', '-O', 'tester.f90']
          flags.extend(spec['veclibfort'].libs.ld_flags.split())
          fc(*flags)
          Executable('./tester')()
  
subject: Fix veclibfort for gcc (#4548)