[Qemu-devel] [PULL v4 06/23] QEMU_BUILD_BUG_ON: use __COUNTER__

[Michael S. Tsirkin]

Some headers use QEMU_BUILD_BUG_ON. This causes a problem
if the C file including that header happens to have
QEMU_BUILD_BUG_ON at the same line number.

Fix using a widely available extension: __COUNTER__.
If unavailable, provide a stub.

Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 include/qemu/compiler.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index 057639a..e0ce9ff 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -97,6 +97,9 @@
 #define QEMU_BUILD_BUG_ON(x)
 #endif
 
+#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
+                                   sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
+
 #if defined __GNUC__
 # if !QEMU_GNUC_PREREQ(4, 4)
    /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */
-- 
MST