avutil/common: error out with clear message if __STDC_CONSTANT_MACROS is not defined...

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

diff --git a/libavutil/common.h b/libavutil/common.h
index b1203ad5a25e3c9467550b078ce13bf3cddee516..e487218e729b3271f6b1e4e64b3f1efd3785751f 100644 (file)
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -26,6 +26,10 @@
 #ifndef AVUTIL_COMMON_H
 #define AVUTIL_COMMON_H
 
+#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
+#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
+#endif
+
 #include <errno.h>
 #include <inttypes.h>
 #include <limits.h>