From 75d19bb087d9b4b5bf1505389b98b2503aa371f0 Mon Sep 17 00:00:00 2001
From: Christoph Hertzberg <chtz@informatik.uni-bremen.de>
Date: Wed, 9 Jul 2014 16:54:15 +0200
Subject: Determine version of Metis library. Apparently, at least version 5.x
 is needed for Eigen/MetisSupport. Marked some internal variables as advanced

---
 cmake/FindMetis.cmake | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'cmake/FindMetis.cmake')

diff --git a/cmake/FindMetis.cmake b/cmake/FindMetis.cmake
index 627c3e9ae..e0040d320 100644
--- a/cmake/FindMetis.cmake
+++ b/cmake/FindMetis.cmake
@@ -10,16 +10,50 @@ find_path(METIS_INCLUDES
   PATHS 
   $ENV{METISDIR} 
   ${INCLUDE_INSTALL_DIR} 
-  PATH_SUFFIXES 
+  PATH_SUFFIXES
+  .
   metis
   include
 )
 
+macro(_metis_check_version)
+  file(READ "${METIS_INCLUDES}/metis.h" _metis_version_header)
+
+  string(REGEX MATCH "define[ \t]+METIS_VER_MAJOR[ \t]+([0-9]+)" _metis_major_version_match "${_metis_version_header}")
+  set(METIS_MAJOR_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+METIS_VER_MINOR[ \t]+([0-9]+)" _metis_minor_version_match "${_metis_version_header}")
+  set(METIS_MINOR_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+METIS_VER_SUBMINOR[ \t]+([0-9]+)" _metis_subminor_version_match "${_metis_version_header}")
+  set(METIS_SUBMINOR_VERSION "${CMAKE_MATCH_1}")
+  if(NOT METIS_MAJOR_VERSION)
+    message(WARNING "Could not determine Metis version. Assuming version 4.0.0")
+    set(METIS_VERSION 4.0.0)
+  else()
+    set(METIS_VERSION ${METIS_MAJOR_VERSION}.${METIS_MINOR_VERSION}.${METIS_SUBMINOR_VERSION})
+  endif()
+  if(${METIS_VERSION} VERSION_LESS ${Metis_FIND_VERSION})
+    set(METIS_VERSION_OK FALSE)
+  else()
+    set(METIS_VERSION_OK TRUE)
+  endif()
+
+  if(NOT METIS_VERSION_OK)
+    message(STATUS "Metis version ${METIS_VERSION} found in ${METIS_INCLUDES}, "
+                   "but at least version ${Metis_FIND_VERSION} is required")
+  endif(NOT METIS_VERSION_OK)
+endmacro(_metis_check_version)
+
+  if(METIS_INCLUDES AND Metis_FIND_VERSION)
+    _metis_check_version()
+  else()
+    set(METIS_VERSION_OK TRUE)
+  endif()
+
 
 find_library(METIS_LIBRARIES metis PATHS $ENV{METISDIR} ${LIB_INSTALL_DIR} PATH_SUFFIXES lib)
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(METIS DEFAULT_MSG
-                                  METIS_INCLUDES METIS_LIBRARIES)
+                                  METIS_INCLUDES METIS_LIBRARIES METIS_VERSION_OK)
 
 mark_as_advanced(METIS_INCLUDES METIS_LIBRARIES)
-- 
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