Fix parsing include dirs and builtin macros for CXX-only projects

Alex

Modules/CMakeFindEclipseCDT4.cmake

@@ -32,7 +32,13 @@ MACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _resultIncludeDirs _resultDefines
   SET(${_resultIncludeDirs})
   SET(_gccOutput)
   FILE(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n" )
-  EXECUTE_PROCESS(COMMAND ${CMAKE_C_COMPILER} -v -E -x ${_lang} -dD dummy
+
+  IF (${_lang} STREQUAL "c++")
+    SET(_compilerExecutable "${CMAKE_CXX_COMPILER}")
+  ELSE (${_lang} STREQUAL "c++")
+    SET(_compilerExecutable "${CMAKE_C_COMPILER}")
+  ENDIF (${_lang} STREQUAL "c++")
+  EXECUTE_PROCESS(COMMAND ${_compilerExecutable} -v -E -x ${_lang} -dD dummy
                   WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles
                   ERROR_VARIABLE _gccOutput
                   OUTPUT_VARIABLE _gccStdout )