diff options
Diffstat (limited to 'X11/Xfuncproto.h.in')
| -rw-r--r-- | X11/Xfuncproto.h.in | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/X11/Xfuncproto.h.in b/X11/Xfuncproto.h.in index 0d7b8b720..dc913face 100644 --- a/X11/Xfuncproto.h.in +++ b/X11/Xfuncproto.h.in @@ -128,10 +128,12 @@ in this Software without prior written authorization from The Open Group. # define _X_ATTRIBUTE_PRINTF(x,y) #endif -/* requires xproto >= 7.0.22 */ +/* requires xproto >= 7.0.22 - since this uses either gcc or C99 variable + argument macros, must be only used inside #ifdef _X_NONNULL guards, as + many legacy X clients are compiled in C89 mode still. */ #if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 303) #define _X_NONNULL(args...) __attribute__((nonnull(args))) -#else +#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ - 0 >= 199901L) /* C99 */ #define _X_NONNULL(...) /* */ #endif |