split off arch-specific stdarg.h stuff

arch/i386/bits/stdarg.h

+#define __VA_ALIGNED_SIZE(x) ((sizeof(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
+
+#define va_start(ap, last) ((ap) = (void *)(((char *)&(last)) + __VA_ALIGNED_SIZE(last)))
+#define va_end(ap) ((void)0)
+#define va_copy(dest, src) ((dest) = (src))
+
+#define va_arg(ap, type) \
+	( ((ap) = (va_list)((char *)(ap) + __VA_ALIGNED_SIZE(type))), \
+	*(type *)(void *)((char *)(ap) - __VA_ALIGNED_SIZE(type)) )

include/stdarg.h

@@ -9,21 +9,7 @@ extern "C" {
 
 #include <bits/alltypes.h>
 
-#define __VA_ALIGNED_SIZE(x) ((sizeof(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
-
-#define va_start(ap, last) ((ap) = (void *)(((char *)&(last)) + __VA_ALIGNED_SIZE(last)))
-#define va_end(ap) ((void)0)
-#define va_copy(dest, src) ((dest) = (src))
-
-#if 0
-#define va_arg(ap, type) \
-	( ((ap) = (va_list)((char *)(ap) + sizeof(type))), \
-	*(type *)(void *)((char *)(ap) - sizeof(type)) )
-#endif
-
-#define va_arg(ap, type) \
-	( ((ap) = (va_list)((char *)(ap) + __VA_ALIGNED_SIZE(type))), \
-	*(type *)(void *)((char *)(ap) - __VA_ALIGNED_SIZE(type)) )
+#include <bits/stdarg.h>
 
 #ifdef __cplusplus
 }