vtk: Added mpi variant (#9494)

var/spack/repos/builtin/packages/vtk/package.py

@@ -48,6 +48,7 @@ class Vtk(CMakePackage):
     variant('osmesa', default=False, description='Enable OSMesa support')
     variant('python', default=False, description='Enable Python support')
     variant('qt', default=False, description='Build with support for Qt')
+    variant('mpi', default=True, description='Enable MPI support')
 
     # Haru causes trouble on Fedora and Ubuntu in v8.1.1
     # See https://bugzilla.redhat.com/show_bug.cgi?id=1460059#c13
@@ -74,6 +75,8 @@ class Vtk(CMakePackage):
     # VTK will need Qt5OpenGL, and qt needs '-opengl' for that
     depends_on('qt+opengl', when='+qt')
 
+    depends_on('mpi', when='+mpi')
+
     depends_on('libharu', when='+haru')
 
     depends_on('expat')
@@ -167,6 +170,12 @@ def cmake_args(self):
                     '-DModule_vtkGUISupportQtOpenGL:BOOL=ON',
                 ])
 
+        if '+mpi' in spec:
+            cmake_args.extend([
+                '-DVTK_Group_MPI:BOOL=ON',
+                '-DVTK_USE_SYSTEM_DIY2=OFF'
+            ])
+
         if '+osmesa' in spec:
             prefix = spec['mesa'].prefix
             osmesa_include_dir = prefix.include