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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.

Backports commit 60abf0a5e05134187e274ce5f32524ccf0cae1a6 from qemu
This commit is contained in:
Michael S. Tsirkin 2018-03-02 00:03:41 -05:00 committed by Lioncash
parent beca05eb5f
commit 7f9fb3395c
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1 changed files with 7 additions and 1 deletions
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8
qemu/include/qemu/compiler.h
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@ -60,8 +60,14 @@ static union MSVC_FLOAT_HACK __NAN = {{0x00, 0x00, 0xC0, 0x7F}};
#define cat(x,y) x ## y
#define cat2(x,y) cat(x,y)
#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) \
typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1] QEMU_UNUSED_VAR
typedef char glue(qemu_build_bug_on__, __COUNTER__)[(x) ? -1 : 1] \
__attribute__((unused))
#else
#define QEMU_BUILD_BUG_ON(x)
#endif
#define GCC_FMT_ATTR(n, m)