[Qemu-devel] [PATCH 3/4] compiler: expression version of QEMU_BUILD_BUG_ON

["Michael S. Tsirkin" <mst@redhat.com>]

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 <mst@redhat.com>
---
 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