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compiler: rework BUG_ON using a struct

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There are theoretical concerns that some compilers might not trigger
build failures on attempts to define an array of size (x ? -1 : 1) where
x is a variable and make it a variable sized array instead. Let rewrite
using a struct with a negative bit field size instead as there are no
dynamic bit field sizes. This is similar to what Linux does.

Backports commit f291887e8eef5d37d31484638f6e62401b4b99a2 from qemu
This commit is contained in:
Michael S. Tsirkin 2018-03-02 00:05:05 -05:00 committed by Lioncash
parent 7f9fb3395c
commit 634a8094f1
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1 changed files with 7 additions and 3 deletions
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10
qemu/include/qemu/compiler.h
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@ -61,10 +61,14 @@ static union MSVC_FLOAT_HACK __NAN = {{0x00, 0x00, 0xC0, 0x7F}};
#define cat(x,y) x ## y
#define cat2(x,y) cat(x,y)
#define QEMU_BUILD_BUG_ON_STRUCT(x) \
struct { \
int:(x) ? -1 : 1; \
}
#ifdef __COUNTER__
#define QEMU_BUILD_BUG_ON(x) \
typedef char glue(qemu_build_bug_on__, __COUNTER__)[(x) ? -1 : 1] \
__attribute__((unused))
#define QEMU_BUILD_BUG_ON(x) typedef QEMU_BUILD_BUG_ON_STRUCT(x) \
glue(qemu_build_bug_on__, __COUNTER__) __attribute__((unused))
#else
#define QEMU_BUILD_BUG_ON(x)
#endif