[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 1/3] mini-os: add BUILD_BUG_ON()
Just copy over what the hypervisor currently uses (comments dropped due to being of unknown origin; the implementation was done by me anyway). Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- v2: Drop comments and clarify origin as per Tim's suggestion. --- a/extras/mini-os/include/lib.h +++ b/extras/mini-os/include/lib.h @@ -54,6 +54,15 @@ #include <xen/event_channel.h> #include "gntmap.h" +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) +#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); }) +#define BUILD_BUG_ON_ZERO(cond) \ + sizeof(struct { _Static_assert(!(cond), "!(" #cond ")"); }) +#else +#define BUILD_BUG_ON_ZERO(cond) sizeof(struct { int:-!!(cond); }) +#define BUILD_BUG_ON(cond) ((void)BUILD_BUG_ON_ZERO(cond)) +#endif + #ifdef HAVE_LIBC #include <sys/queue.h> #include <stdio.h> Attachment:
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