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[Qemu-devel] [PULL v5 06/22] compiler: expression version of QEMU_BUILD_

From: Michael S. Tsirkin
Subject: [Qemu-devel] [PULL v5 06/22] compiler: expression version of QEMU_BUILD_BUG_ON
Date: Tue, 31 Jan 2017 22:19:10 +0200

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 <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Markus Armbruster <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)
+                                   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. */

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