add print for compiler is gnu

Tests/SystemInformation/SystemInformation.in

@@ -5,6 +5,7 @@ CMAKE_SHARED_LIBRARY_SUFFIX == "${CMAKE_SHARED_LIBRARY_SUFFIX}"
 CMAKE_SHARED_MODULE_PREFIX == "${CMAKE_SHARED_MODULE_PREFIX}"
 CMAKE_SHARED_MODULE_SUFFIX == "${CMAKE_SHARED_MODULE_SUFFIX}"
 
+
 CMAKE_DL_LIBS == "${CMAKE_DL_LIBS}"
 CMAKE_LIBRARY_PATH_FLAG == "${CMAKE_LIBRARY_PATH_FLAG}"
 CMAKE_LINK_LIBRARY_FLAG == "${CMAKE_LINK_LIBRARY_FLAG}"
@@ -14,6 +15,8 @@ CMAKE_SYSTEM_NAME == "${CMAKE_SYSTEM_NAME}"
 CMAKE_SYSTEM == "${CMAKE_SYSTEM}"
 CMAKE_CXX_COMPILER == "${CMAKE_CXX_COMPILER}"
 CMAKE_C_COMPILER == "${CMAKE_C_COMPILER}"
+CMAKE_COMPILER_IS_GNUCC == "${CMAKE_COMPILER_IS_GNUCC}"
+CMAKE_COMPILER_IS_GNUCXX == "${CMAKE_COMPILER_IS_GNUCXX}"
 
 // C shared library flag
 CMAKE_SHARED_LIBRARY_C_FLAGS == "${CMAKE_SHARED_LIBRARY_C_FLAGS}"