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

From: Michael S. Tsirkin
Subject: [Qemu-devel] [PULL v4 06/23] QEMU_BUILD_BUG_ON: use __COUNTER__
Date: Tue, 31 Jan 2017 20:43:00 +0200

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)
+                                   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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