diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index f212c5d30..b3417d328 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -14,6 +14,9 @@ MACRO(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
       "${CMAKE_${lang}_COMPILER_ID_SRC}")
   ENDIF(CMAKE_HOST_WIN32 AND NOT CMAKE_HOST_UNIX)
 
+  # Make sure the compiler arguments are clean.
+  STRING(STRIP "${CMAKE_${lang}_COMPILER_ARG1}" CMAKE_${lang}_COMPILER_ID_ARG1)
+
   # Make sure user-specified compiler flags are used.
   IF(CMAKE_${lang}_FLAGS)
     SET(CMAKE_${lang}_COMPILER_ID_FLAGS ${CMAKE_${lang}_FLAGS})
@@ -30,7 +33,7 @@ MACRO(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   STRING(REGEX REPLACE " " ";" CMAKE_${lang}_COMPILER_ID_FLAGS_LIST "${CMAKE_${lang}_COMPILER_ID_FLAGS}")
   IF(COMMAND EXECUTE_PROCESS)
     EXECUTE_PROCESS(
-      COMMAND ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ARG1} ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST} ${CMAKE_${lang}_COMPILER_ID_SRC}
+      COMMAND ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_ARG1} ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST} ${CMAKE_${lang}_COMPILER_ID_SRC}
       WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
       OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
       ERROR_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
@@ -39,7 +42,7 @@ MACRO(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   ELSE(COMMAND EXECUTE_PROCESS)
     EXEC_PROGRAM(
       ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_DIR}
-      ARGS ${CMAKE_${lang}_COMPILER_ARG1} ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST} \"${CMAKE_${lang}_COMPILER_ID_SRC}\"
+      ARGS ${CMAKE_${lang}_COMPILER_ID_ARG1} ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST} \"${CMAKE_${lang}_COMPILER_ID_SRC}\"
       OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
       RETURN_VALUE CMAKE_${lang}_COMPILER_ID_RESULT
       )