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QEMU_BUILD_BUG_ON: use __COUNTER__

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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 <mst@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2017-01-31 16:29:51 +02:00
parent 32f825dece
commit 60abf0a5e0
1 changed files with 5 additions and 1 deletions
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6
include/qemu/compiler.h
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@ -85,9 +85,13 @@
#define typeof_field(type, field) typeof(((type *)0)->field)
#define type_check(t1,t2) ((t1*)0 - (t2*)0)
#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) \
typedef char glue(qemu_build_bug_on__, __LINE__)[(x) ? -1 : 1] \
typedef char glue(qemu_build_bug_on__, __COUNTER__)[(x) ? -1 : 1] \
__attribute__((unused))
#else
#define QEMU_BUILD_BUG_ON(x)
#endif
#if defined __GNUC__
# if !QEMU_GNUC_PREREQ(4, 4)