Test CMAKE_GNUtoMS option in ExportImport on MinGW and MSys

Tests/ExportImport/CMakeLists.txt

@@ -22,6 +22,11 @@ else(CMAKE_CONFIGURATION_TYPES)
   endif(CMAKE_BUILD_TYPE)
 endif(CMAKE_CONFIGURATION_TYPES)
 
+if(MINGW OR MSYS)
+  # Test CMAKE_GNUtoMS whether we have VS or not.
+  set(ExportImport_GNUtoMS 1)
+endif()
+
 configure_file(${ExportImport_SOURCE_DIR}/InitialCache.cmake.in
                ${ExportImport_BINARY_DIR}/InitialCache.cmake @ONLY)
 

Tests/ExportImport/InitialCache.cmake.in

@@ -12,3 +12,4 @@ SET(CMAKE_CXX_FLAGS_MINSIZEREL "@CMAKE_CXX_FLAGS_MINSIZEREL@" CACHE STRING "C++
 SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "@CMAKE_CXX_FLAGS_RELWITHDEBINFO@" CACHE STRING "C++ Flags")
 SET(CMAKE_INSTALL_PREFIX "@ExportImport_BINARY_DIR@/Root" CACHE STRING "Installation Prefix")
 SET(CMAKE_SKIP_RPATH ON CACHE BOOL "No RPATH")
+SET(CMAKE_GNUtoMS "@ExportImport_GNUtoMS@" CACHE BOOL "CMAKE_GNUtoMS")