Update CMakeLists.txt for backward compatibility.

AMDiS/CMakeLists.txt

@@ -16,6 +16,7 @@ endif ()
 # ------------------------------------------------------------------------------
 
 # some options to control the build process
+option(ENABLE_PARALLEL_DOMAIN "Use parallel domain decomposition"     false)
 option(ENABLE_MPI             "Compile with MPI compiler and library" false)
 option(ENABLE_UMFPACK         "Enable support for the UMFPACK solver" true)
 option(ENABLE_EXTENSIONS      "Use extensions for AMDiS"              false)
@@ -23,10 +24,6 @@ option(ENABLE_HYPRE           "Use HYPRE AMG solver"                  false)
 option(ENABLE_PNG             "Use png reader/writer"                 false)
 
 include(CMakeDependentOption)
-cmake_dependent_option(ENABLE_PARALLEL_DOMAIN
-  "Use parallel domain decomposition" true
-  "ENABLE_MPI" false)
-
 # additional options for parallel_domain
 # {
 cmake_dependent_option(ENABLE_ZOLTAN
@@ -72,6 +69,7 @@ endif (MSVC)
 
 # parallel of sequential version
 if (ENABLE_PARALLEL_DOMAIN)
+  set(ENABLE_MPI CACHE BOOL "Compile with MPI compiler and library" FORCE)
   set(POSTFIX "-p")
 else ()
   set(POSTFIX "-s")