Move check for ParMETS version for Zoltan2 to Zoltan2 (#63)

When ParMEITS is found by an upstream cmake project (e.g. KokkosKerenls), the
value of HAVE_PARMETIS_VERSION_4_0_3l does not get written into the
ParMETISConfig.cmake file so Zoltan2 was configuring with an error.  But this
is a check for Zoltan2, not other Trilinos packages anyway so this check
should be in Zoltan2, not in the FindTPLParMETIS.cmake

NOTE: If we want to support exporting various variables into the generated
<tplName>Config.cmake files for TriBITS TPLs generated using
tribits_tpl_find_include_dirs_and_libraries(), then we will need to do some
refactoring in TriBITS to make that possible. But that should not be too hard.
This was just not needed in this case.

cmake/TPLs/FindTPLParMETIS.cmake

@@ -58,35 +58,3 @@ TRIBITS_TPL_FIND_INCLUDE_DIRS_AND_LIBRARIES( ParMETIS
   REQUIRED_HEADERS "parmetis.h;metis.h"
   REQUIRED_LIBS_NAMES "parmetis;metis"
   )
-
-# Zoltan2 has a dependency on ParMETIS 4.0.3
-
-include(CheckCSourceCompiles)
-FUNCTION(CHECK_PARMETIS_HAS_VERSION_4_0_3  VARNAME)
-  SET(SOURCE
-  "
-  #include <stdio.h>
-  #include <parmetis.h>
-  int main()
-  {
-    #if PARMETIS_MAJOR_VERSION > 4
-      return 0;
-    #elif PARMETIS_MAJOR_VERSION == 4 && PARMETIS_MINOR_VERSION > 0
-      return 0;
-    #elif PARMETIS_MAJOR_VERSION == 4 && PARMETIS_MINOR_VERSION == 0 && PARMETIS_SUBMINOR_VERSION >= 3
-      return 0;
-    #else
-      parmetis_version_failure
-    #endif
-  }
-
-  "
-  )
-  SET(CMAKE_REQUIRED_LIBRARIES ParMETIS::all_libs)
-  CHECK_C_SOURCE_COMPILES("${SOURCE}" ${VARNAME})
-ENDFUNCTION()
-
-# We can't compile ParMETIS without MPI
-IF(TPL_ENABLE_MPI AND TPL_ENABLE_ParMETIS)
-  CHECK_PARMETIS_HAS_VERSION_4_0_3(HAVE_PARMETIS_VERSION_4_0_3)
-ENDIF()

packages/zoltan2/core/CMakeLists.txt

@@ -4,9 +4,13 @@ IF(Zoltan2_ENABLE_ParMETIS AND NOT TPL_ENABLE_MPI)
     "Zoltan2_ENABLE_ParMETIS OFF.")
 ENDIF()
 
-IF(Zoltan2_ENABLE_ParMETIS AND NOT HAVE_PARMETIS_VERSION_4_0_3)
-  MESSAGE(FATAL_ERROR "Zoltan2 requires ParMETIS_version 4.0.3 or later. Upgrade"
-    " or set TPL_ENABLE_ParMETIS OFF or set Zoltan2_ENABLE_ParMETIS OFF.")
+IF(Zoltan2_ENABLE_ParMETIS)
+  INCLUDE("${CMAKE_CURRENT_LIST_DIR}/cmake/Zoltan2CheckParMETISVersion.cmake")
+  ZOLTAN2_CHECK_PARMETIS_HAS_VERSION_4_0_3(HAVE_PARMETIS_VERSION_4_0_3l)
+  IF (NOT "${HAVE_PARMETIS_VERSION_4_0_3l}" STREQUAL "1")
+    MESSAGE(FATAL_ERROR "Zoltan2 requires ParMETIS_version 4.0.3 or later. Upgrade"
+      " or set TPL_ENABLE_ParMETIS OFF or set Zoltan2_ENABLE_ParMETIS OFF.")
+  ENDIF()
 ENDIF()
 
 IF(Zoltan2_ENABLE_Scotch AND NOT HAVE_SCOTCH_VERSION_6_0_3)

packages/zoltan2/core/cmake/Zoltan2CheckParMETISVersion.cmake

@@ -0,0 +1,25 @@
+include(CheckCSourceCompiles)
+
+FUNCTION(ZOLTAN2_CHECK_PARMETIS_HAS_VERSION_4_0_3  VARNAME)
+  SET(SOURCE
+  "
+  #include <stdio.h>
+  #include <parmetis.h>
+  int main()
+  {
+    #if PARMETIS_MAJOR_VERSION > 4
+      return 0;
+    #elif PARMETIS_MAJOR_VERSION == 4 && PARMETIS_MINOR_VERSION > 0
+      return 0;
+    #elif PARMETIS_MAJOR_VERSION == 4 && PARMETIS_MINOR_VERSION == 0 && PARMETIS_SUBMINOR_VERSION >= 3
+      return 0;
+    #else
+      parmetis_version_failure
+    #endif
+  }
+
+  "
+  )
+  SET(CMAKE_REQUIRED_LIBRARIES ParMETIS::all_libs)
+  CHECK_C_SOURCE_COMPILES("${SOURCE}" ${VARNAME})
+ENDFUNCTION()