ENH: support STDDEF and cleanup

Modules/CheckTypeSize.c

@@ -8,6 +8,10 @@
 #  include <stdint.h>
 #endif /* HAVE_STDINT_H */
 
+#ifdef HAVE_STDDEF_H
+#  include <stddef.h>
+#endif /* HAVE_STDDEF_H */
+
 #ifdef __CLASSIC_C__
 int main(){
   int ac;

Modules/CheckTypeSize.cmake

@@ -12,13 +12,12 @@ MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
   IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
     SET(MACRO_CHECK_TYPE_SIZE_FLAGS 
       "-DCHECK_TYPE_SIZE_TYPE=\"${TYPE}\" ${CMAKE_REQUIRED_FLAGS}")
-    IF(HAVE_SYS_TYPES_H)
-      SET(MACRO_CHECK_TYPE_SIZE_FLAGS 
-        "${MACRO_CHECK_TYPE_SIZE_FLAGS} -DHAVE_SYS_TYPES_H")
-    ENDIF(HAVE_SYS_TYPES_H)
-    IF(HAVE_STDINT_H)
-      SET(MACRO_CHECK_TYPE_SIZE_FLAGS "${MACRO_CHECK_TYPE_SIZE_FLAGS} -DHAVE_STDINT_H")
-    ENDIF(HAVE_STDINT_H)
+    FOREACH(def HAVE_SYS_TYPES_H HAVE_STDINT_H HAVE_STDDEF_H)
+      IF("${def}")
+        SET(MACRO_CHECK_TYPE_SIZE_FLAGS 
+          "${MACRO_CHECK_TYPE_SIZE_FLAGS} -D${def}")
+      ENDIF("${def}")
+    ENDFOREACH(def)
     MESSAGE(STATUS "Check size of ${TYPE}")
     IF(CMAKE_REQUIRED_LIBRARIES)
       SET(CHECK_TYPE_SIZE_ADD_LIBRARIES