BUG: Unly set gcc flags for C compiler if CMAKE_COMPILER_IS_GNUCC is set

Modules/CMakeSystemSpecificInformation.cmake

@@ -28,8 +28,10 @@ SET(CMAKE_SHARED_LIBRARY_RUNTIME_FLAG "")       # -rpath
 SET(CMAKE_SHARED_LIBRARY_RUNTIME_FLAG_SEP "")   # : or empty
 SET(CMAKE_LIBRARY_PATH_FLAG "-L")
 SET(CMAKE_LINK_LIBRARY_FLAG "-l")
-IF(CMAKE_COMPILER_IS_GNUCXX)
+IF(CMAKE_COMPILER_IS_GNUCC)
   SET(CMAKE_SHARED_LIBRARY_C_FLAGS "-fPIC")     # -pic 
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
+IF(CMAKE_COMPILER_IS_GNUCXX)
   SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-fPIC")   # -pic
 ENDIF(CMAKE_COMPILER_IS_GNUCXX)