Subject: [PATCH] Use more gcc extensions in the Linux headers
Newsgroups: gmane.linux.kernel
Date: 2007-03-09 05:56:32 GMT (2 years, 16 weeks, 6 days, 1 hour and 13 minutes ago)
__builtin_types_compatible_p() has been around since gcc 2.95, and we don't use it anywhere. This patch quietly fixes that. Signed-off-by: Rusty Russell <rusty <at> rustcorp.com.au> diff -r f0ff8138f993 include/linux/kernel.h --- a/include/linux/kernel.h Fri Mar 09 16:40:25 2007 +1100 +++ b/include/linux/kernel.h Fri Mar 09 16:44:04 2007 +1100 @@ -35,7 +35,9 @@ extern const char linux_proc_banner[]; #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) -#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) \ + + sizeof(typeof(int[1 - 2*!!__builtin_types_compatible_p(typeof(arr), \ + typeof(&arr[0]))]))*0) #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))