old_contents: ##############################################################################
  # Copyright (c) 2013-2017, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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 *
  
  
  class Elfutils(AutotoolsPackage):
      """elfutils is a collection of various binary tools such as
      eu-objdump, eu-readelf, and other utilities that allow you to
      inspect and manipulate ELF files. Refer to Table 5.Tools Included
      in elfutils for Red Hat Developer for a complete list of binary
      tools that are distributed with the Red Hat Developer Toolset
      version of elfutils."""
  
      homepage = "https://fedorahosted.org/elfutils/"
  
      url = "https://sourceware.org/elfutils/ftp/0.168/elfutils-0.168.tar.bz2"
      list_url = "https://sourceware.org/elfutils/ftp"
      list_depth = 1
  
      version('0.170', '03599aee98c9b726c7a732a2dd0245d5')
      version('0.168', '52adfa40758d0d39e5d5c57689bf38d6')
      version('0.163', '77ce87f259987d2e54e4d87b86cbee41', preferred=True)
  
      depends_on('flex', type='build')
      depends_on('bison', type='build')
      depends_on('gettext')
      conflicts('%gcc@7.2.0:', when='@0.163')
  
      provides('elf@1')
  
      def configure_args(self):
          # configure doesn't use LIBS correctly
          gettext_lib = self.spec['gettext'].prefix.lib,
          return [
              'LDFLAGS=-Wl,--no-as-needed -L%s -lintl' % gettext_lib,
              '--enable-maintainer-mode']
  
new_contents: ##############################################################################
  # Copyright (c) 2013-2017, 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/spack/spack
  # Please also see the NOTICE and LICENSE files 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 *
  
  
  class Elfutils(AutotoolsPackage):
      """elfutils is a collection of various binary tools such as
      eu-objdump, eu-readelf, and other utilities that allow you to
      inspect and manipulate ELF files. Refer to Table 5.Tools Included
      in elfutils for Red Hat Developer for a complete list of binary
      tools that are distributed with the Red Hat Developer Toolset
      version of elfutils."""
  
      homepage = "https://fedorahosted.org/elfutils/"
  
      url = "https://sourceware.org/elfutils/ftp/0.168/elfutils-0.168.tar.bz2"
      list_url = "https://sourceware.org/elfutils/ftp"
      list_depth = 1
  
      version('0.170', '03599aee98c9b726c7a732a2dd0245d5')
      version('0.168', '52adfa40758d0d39e5d5c57689bf38d6')
      version('0.163', '77ce87f259987d2e54e4d87b86cbee41', preferred=True)
  
      depends_on('flex', type='build')
      depends_on('bison', type='build')
      depends_on('gettext')
      conflicts('%gcc@7.2.0:', when='@0.163')
  
      provides('elf@1')
  
      # Elfutils uses nested functions in C code, which is implemented
      # in gcc, but not in clang. C code compiled with gcc is
      # binary-compatible with clang, so it should be possible to build
      # elfutils with gcc, and then link it to clang-built libraries.
      conflicts('%clang')
  
      def configure_args(self):
          # configure doesn't use LIBS correctly
          gettext_lib = self.spec['gettext'].prefix.lib,
          return [
              'LDFLAGS=-Wl,--no-as-needed -L%s -lintl' % gettext_lib,
              '--enable-maintainer-mode']
  
subject: document conflict with clang (#7096)