use va_copy() where it exists

1 files changed, 7 insertions, 0 deletions

diff --git a/proto.h b/proto.h
index 8a88829..82e5cb7 100644
--- a/proto.h
+++ b/proto.h
@@ -23,6 +23,13 @@ typedef long align_t;
 
 #include <stdarg.h>
 
+/* C 9x specifies a va_copy() macro which should be used for copying
+objects of type va_list.  Of course, most places don't have this yet,
+but where it does exist we need to use it. */
+#ifndef va_copy
+#define va_copy(x,y) (x)=(y)
+#endif
+
 #if STDC_HEADERS
 
 #include <stdlib.h>