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rewrite QEMU_BUILD_BUG_ON 

On some platforms, __LINE__ will not expand to real number in QEMU_BUILD_BUG_ON,
so if using QEMU_BUILD_BUG_ON twice, compiler will report errors. This patch will
fix it.

BTW, I got error message on RHEL 6.1/gcc 4.4.5.

Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Dong Xu Wang 2011-12-20 17:03:47 +08:00 committed by Kevin Wolf
parent 75bab85ca0
commit ea8f978ffe
1 changed files with 3 additions and 1 deletions
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4
compiler.h
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@ -30,8 +30,10 @@
# define QEMU_PACKED __attribute__((packed)) # define QEMU_PACKED __attribute__((packed))
#endif #endif
#define cat(x,y) x ## y
#define cat2(x,y) cat(x,y)
#define QEMU_BUILD_BUG_ON(x) \ #define QEMU_BUILD_BUG_ON(x) \
typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1]; typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1];
#if defined __GNUC__ #if defined __GNUC__
# if !QEMU_GNUC_PREREQ(4, 4) # if !QEMU_GNUC_PREREQ(4, 4)