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r17645: gcc 4.1.x has started producing "value computed is not used" warnings

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in very annoying ways for talloc_steal. This rather strange looking
cpp approach avoids these warnings. It's really a problem in gcc, but
better to do this than put up with the huge flood of warnings.
(This used to be commit 8236a0ac5e80c30e52fccc0ef41a6c808ea43420)
This commit is contained in:
Andrew Tridgell 2006-08-21 01:27:22 +00:00 committed by Gerald (Jerry) Carter
parent c8064e1f92
commit f23be49188
1 changed files with 4 additions and 1 deletions
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5
source4/lib/talloc/talloc.h
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@ -62,10 +62,14 @@ typedef void TALLOC_CTX;
_talloc_set_destructor((ptr), (void *)_talloc_destructor_fn); \
} while(0)
#define _TALLOC_CHECK_TYPE(type,val)
/* this extremely strange macro is to avoid some braindamaged warning
stupidity in gcc 4.1.x */
#define talloc_steal(ctx, ptr) ({ __typeof__(ptr) __talloc_steal_ret = (__typeof__(ptr))_talloc_steal((ctx),(ptr)); __talloc_steal_ret; })
#else
#define talloc_set_destructor(ptr, function) \
_talloc_set_destructor((ptr), (int (*)(void *))(function))
#define _TALLOC_TYPEOF(ptr) void *
#define talloc_steal(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_steal((ctx),(ptr))
#endif
/* useful macros for creating type checked pointers */
@ -90,7 +94,6 @@ typedef void TALLOC_CTX;
#define talloc_get_type(ptr, type) (type *)talloc_check_name(ptr, #type)
#define talloc_find_parent_bytype(ptr, type) (type *)talloc_find_parent_byname(ptr, #type)
#define talloc_steal(ctx, ptr) (_TALLOC_TYPEOF(ptr))_talloc_steal((ctx),(ptr))
#if TALLOC_DEPRECATED
#define talloc_zero_p(ctx, type) talloc_zero(ctx, type)