[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] libs/gnttab: introduce BUILD_BUG_ON
The implementation is taken from libxc. Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx> --- Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> Cc: Paulina Szubarczyk <paulinaszubarczyk@xxxxxxxxx> I could have put it in a header file accessible to all libraries under libs but this construct is only relevant to xengnttab library at the moment so it's put under gnttab/private.h. It can be easily moved to a common place when other libraries under libs require it. This patch is necessary to unblock Paulina on her gnttab copy work. --- tools/libs/gnttab/private.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/libs/gnttab/private.h b/tools/libs/gnttab/private.h index d286c86..da487f2 100644 --- a/tools/libs/gnttab/private.h +++ b/tools/libs/gnttab/private.h @@ -4,6 +4,13 @@ #include <xentoollog.h> #include <xengnttab.h> +/* Force a compilation error if condition is true */ +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) +#define BUILD_BUG_ON(p) ({ _Static_assert(!(p), "!(" #p ")"); }) +#else +#define BUILD_BUG_ON(p) ((void)sizeof(struct { int:-!!(p); })) +#endif + struct xengntdev_handle { xentoollog_logger *logger, *logger_tofree; int fd; -- 2.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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