QEMU_BUILD_BUG_ON uses a typedef in order to be safe to use outside functions, but sometimes it's useful to have a version that can be used within an expression. Following what Linux does, introduce QEMU_BUILD_BUG_ON_ZERO that return zero after checking condition at build time.
Signed-off-by: Michael S. Tsirkin <[email protected]> --- include/qemu/compiler.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 1a9eeb9..d2b05dd 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -88,6 +88,8 @@ #define QEMU_BUILD_BUG_ON(x) \ typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused)) +#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(int[(x)?-1:1]) - sizeof(int)) + #if defined __GNUC__ # if !QEMU_GNUC_PREREQ(4, 4) /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ -- MST
