old_contents: ##############################################################################
  # Copyright (c) 2013-2018, 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 *
  import platform
  
  
  class Vecgeom(CMakePackage):
      """The vectorized geometry library for particle-detector simulation
      (toolkits)."""
  
      homepage = "https://gitlab.cern.ch/VecGeom/VecGeom"
      url = "https://gitlab.cern.ch/api/v4/projects/VecGeom%2FVecGeom/repository/archive.tar.gz?sha=v0.3.rc"
  
      version('0.3.rc', 'c1f5d620f655f3c0610a44e7735203b5')
  
      depends_on('cmake@3.5:', type='build')
  
      def cmake_args(self):
          options = [
              '-DBACKEND=Scalar',
              '-DGEANT4=OFF',
              '-DUSOLIDS=ON',
              '-DUSOLIDS_VECGEOM=ON'
          ]
  
          arch = platform.machine()
          if arch == 'x86_64':
              options.append('-DVECGEOM_VECTOR=sse4.2')
          else:
              options.append('-DVECGEOM_VECTOR=' + arch)
          return options
  
new_contents: ##############################################################################
  # Copyright (c) 2013-2018, 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 *
  import platform
  
  
  class Vecgeom(CMakePackage):
      """The vectorized geometry library for particle-detector simulation
      (toolkits)."""
  
      homepage = "https://gitlab.cern.ch/VecGeom/VecGeom"
      url = "https://gitlab.cern.ch/api/v4/projects/VecGeom%2FVecGeom/repository/archive.tar.gz?sha=v0.3.rc"
  
      version('01.00.00', git='https://gitlab.cern.ch/VecGeom/VecGeom.git', tag='v01.00.00')
      version('00.05.00', git='https://gitlab.cern.ch/VecGeom/VecGeom.git', tag='v00.05.00', preferred=True)
      version('0.3.rc', 'c1f5d620f655f3c0610a44e7735203b5')
  
      variant('cxxstd',
              default='17',
              values=('14', '17'),
              multi=False,
              description='Use the specified C++ standard when building.')
      variant('vector',
               default='native',
               values=('sse3', 'sse4.2', 'native'),
               multi=False,
               description='Specify the instruction set for vectorization.')
  
      depends_on('cmake@3.5:', type='build')
  
      def cmake_args(self):
          options = [
              '-DBACKEND=Scalar',
              '-DGEANT4=OFF',
              '-DUSOLIDS=ON',
              '-DUSOLIDS_VECGEOM=ON',
              '-DROOT=OFF',
              '-DNO_SPECIALIZATION=ON',
              '-DCMAKE_VERBOSE_MAKEFILE=TRUE']
          options.append('-DCMAKE_CXX_STANDARD={0}'.
                         format(self.spec.variants['cxxstd'].value))
          arch = platform.machine()
          if arch == 'x86_64':
              options.append('-DVECGEOM_VECTOR={0}'.
                             format(self.spec.variants['vector'].value))
          else:
              options.append('-DVECGEOM_VECTOR=' + arch)
          return options
  
subject: add versions and cxxstd variant (#9303)