Messages in this thread | | | Date | Tue, 5 Jun 2007 18:18:49 +0400 | From | Alexey Dobriyan <> | Subject | sparse and ARRAY_SIZE() foolproofing |
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For every valid ARRAY_SIZE() use sparse warns about "cannot size expression". This is somewhat annoying, because code is OK.
$ cat 1.c #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) #define __must_be_array(a) BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0]))) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
int f(void) { int a[42];
return ARRAY_SIZE(a); } $ sparse 1.c 1.c:9:9: error: cannot size expression
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