From 747fb056301257211772bdce2ecdd44d72e1278e Mon Sep 17 00:00:00 2001
From: Radovan Bast <bast@users.noreply.github.com>
Date: Fri, 18 Sep 2015 15:44:55 +0200
Subject: [PATCH] pedestrian workaround for Fortran OMP

---
 modules/omp.cmake | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/modules/omp.cmake b/modules/omp.cmake
index 6582608..ebab65f 100644
--- a/modules/omp.cmake
+++ b/modules/omp.cmake
@@ -24,7 +24,25 @@ if(ENABLE_OPENMP)
     find_package(OpenMP)
     if(OPENMP_FOUND)
         if(DEFINED CMAKE_Fortran_COMPILER_ID)
-            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_Fortran_FLAGS}")
+            # the following works with recent CMake (added Aug 2014)
+            # set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_Fortran_FLAGS}")
+
+            # therefore we use a pedestrian approach:
+            if(CMAKE_Fortran_COMPILER_ID MATCHES GNU)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fopenmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES Intel)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -openmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES PGI)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES XL)
+                set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qsmp")
+            endif()
+            if(CMAKE_Fortran_COMPILER_ID MATCHES Cray)
+                # do nothing in this case
+            endif()
         endif()
         if(DEFINED CMAKE_C_COMPILER_ID)
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")