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-rw-r--r--include/stdarg.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/stdarg.h b/include/stdarg.h
index 666adf7..154030f 100644
--- a/include/stdarg.h
+++ b/include/stdarg.h
@@ -19,9 +19,9 @@ void __va_end(va_list ap);
#else /* _WIN64 */
typedef char *va_list;
-#define va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+7)&~7)
-#define va_arg(ap,type) (ap += (sizeof(type)+7)&~7, *(type *)(ap - ((sizeof(type)+7)&~7)))
-#define va_copy(dest, src) (dest) = (src)
+#define va_start(ap,last) __builtin_va_start(ap,last)
+#define va_arg(ap,type) (ap += 8, sizeof(type)<=8 ? *(type*)ap : **(type**)ap)
+#define va_copy(dest, src) ((dest) = (src))
#define va_end(ap)
#endif