Messages in this thread | | | Date | Mon, 03 Mar 2008 09:03:35 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/2] Add C99-style constructor macros for specific-sized integers |
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Sam Ravnborg wrote: > > And in linux/const.h we have yet another variant: > /* Some constant macros are used in both assembler and > * C code. Therefore we cannot annotate them always with > * 'UL' and other type specifiers unilaterally. We > * use the following macros to deal with this. > * > * Similarly, _AT() will cast an expression with a type in C, but > * leave it unchanged in asm. > */ > > #ifdef __ASSEMBLY__ > #define _AC(X,Y) X > #define _AT(T,X) X > #else > #define __AC(X,Y) (X##Y) > #define _AC(X,Y) __AC(X,Y) > #define _AT(T,X) ((T)(X)) > #endif > > Not as typestrict as hpa's and arm's version but > used in a few placed already. >
These, unfortunately, don't solve the issue of gcc warnings, and you don't want to make them paste ULL on before the cast, since I think they're used with non-simple constants.
-hpa
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