BUG: Fixed same spaces-in-paths problem for CMakeTestGNU.c as in CMakeDetermineCCompiler.cmake.

Modules/CMakeDetermineCXXCompiler.cmake

@@ -40,7 +40,7 @@ MARK_AS_ADVANCED(CMAKE_CXX_COMPILER)
 
 
 # test to see if the cxx compiler is gnu
-EXEC_PROGRAM(${CMAKE_CXX_COMPILER} ARGS -E ${CMAKE_ROOT}/Modules/CMakeTestGNU.c OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT RETURN_VALUE CMAKE_COMPILER_RETURN)
+EXEC_PROGRAM(${CMAKE_CXX_COMPILER} ARGS -E "\"${CMAKE_ROOT}/Modules/CMakeTestGNU.c\"" OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT RETURN_VALUE CMAKE_COMPILER_RETURN)
 IF(NOT CMAKE_COMPILER_RETURN)
   IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
     SET(CMAKE_COMPILER_IS_GNUCXX 1)