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compiler: expression version of QEMU_BUILD_BUG_ON

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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.

Backports commit d757573e69f2ef58a4a7b41f6c55d65fa1e1c5c2 from qemu
This commit is contained in:
Michael S. Tsirkin 2018-03-02 00:07:30 -05:00 committed by Lioncash
parent 634a8094f1
commit ac013df0a2
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 18 additions and 3 deletions
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21
qemu/include/qemu/compiler.h
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@ -68,11 +68,14 @@ static union MSVC_FLOAT_HACK __NAN = {{0x00, 0x00, 0xC0, 0x7F}};
#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
glue(qemu_build_bug_on__, __COUNTER__) QEMU_UNUSED_VAR
#else
#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)))
#define GCC_FMT_ATTR(n, m)
#else
@ -172,8 +175,20 @@ static union MSVC_FLOAT_HACK __NAN = {{0x00, 0x00, 0xC0, 0x7F}};
#define inline always_inline
#endif
#define QEMU_BUILD_BUG_ON(x) \
typedef char glue(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused));
#define QEMU_BUILD_BUG_ON_STRUCT(x) \
struct { \
int:(x) ? -1 : 1; \
}
#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
glue(qemu_build_bug_on__, __COUNTER__) QEMU_UNUSED_VAR
#else
#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)