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macro.h: let F_TYPE_CMP() macro fail to compile, if second parameter is not const

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If the magic parameter is not a const, then the macro does not work, so
better fail to compile, than be surprised afterwards.
This commit is contained in:
Harald Hoyer 2013-04-18 12:05:41 +02:00
parent 98f59e59e0
commit a858b64ddd
1 changed files with 5 additions and 4 deletions
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9
src/shared/macro.h
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@ -272,11 +272,12 @@ do { \
* signed int in the kernel and these negative numbers are extended to
* long, which cannot be simply compared to the magic constants anymore.
*/
#define F_TYPE_CMP(f, c) \
#define F_TYPE_CMP(f_type, magic) \
__extension__ ({ \
__SWORD_TYPE _f = (f); \
const __SWORD_TYPE _c = (c); \
const int _c32 = (c); \
__SWORD_TYPE _f = (f_type); \
const __SWORD_TYPE _c = (magic); \
const int _c32 = 1 ? (magic) \
: sizeof((int[magic]){0}); \
(_f == _c || _f == _c32 ); \
})