From ce1e5e52dddaf95e80bfb8313a7f2a4947036ebc Mon Sep 17 00:00:00 2001
From: Hauke Heibel <hauke.heibel@gmail.com>
Date: Thu, 1 Jul 2010 07:28:16 +0200
Subject: [PATCH] Enable OpenMP testing for MSVC. Added CMake comments.

---
 CMakeLists.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 45b109d9a..2d302386c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -174,7 +174,19 @@ if(MSVC)
   #         exceptions to cover indexing errors.
   # C4505 - unreferenced local function has been removed (impossible to deactive selectively)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHsc /wd4127 /wd4505 /wd4714")
+
+  # replace all /Wx by /W4
   string(REGEX REPLACE "/W[0-9]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+
+  check_cxx_compiler_flag("/openmp" COMPILER_SUPPORT_OPENMP)
+  if(COMPILER_SUPPORT_OPENMP)
+    option(EIGEN_TEST_OPENMP "Enable/Disable OpenMP in tests/examples" OFF)
+    if(EIGEN_TEST_OPENMP)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /openmp")
+      message("Enabling OpenMP in tests/examples")
+    endif()
+  endif()
+
   option(EIGEN_TEST_SSE2 "Enable/Disable SSE2 in tests/examples" OFF)
   if(EIGEN_TEST_SSE2)
     if(NOT CMAKE_CL_64)