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libctf: use __attribute__((__gnu_printf__)) where appropriate

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We don't use any GNU-specific printf args, but this prevents warnings about
%z, observed on MinGW even though every libc anyone is likely to use there
supports %z perfectly well, and we're not stopping using it just because
MinGW complains.  Doing this means we stand more chance of seeing *actual*
problems on such platforms without them being drowned in noise.

We turn this off on clang, which doesn't support __gnu_printf__.

Suggested by Eli Zaretskii.

libctf/
	PR libctf/31863
	* ctf-impl.h (_libctf_printflike_): Use __gnu_printf__.
This commit is contained in:
Nick Alcock
2025-06-03 13:39:33 +01:00
parent d4e9d95657
commit f86f9fd859
1 changed files with 5 additions and 0 deletions
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5
libctf/ctf-impl.h
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@@ -66,8 +66,13 @@ extern "C"
macros glibc may introduce, which have names of the pattern
__attribute_blah__. */
#if defined (__clang__)
#define _libctf_printflike_(string_index,first_to_check) \
__attribute__ ((__format__ (__printf__, (string_index), (first_to_check))))
#else
#define _libctf_printflike_(string_index,first_to_check) \
__attribute__ ((__format__ (__gnu_printf__, (string_index), (first_to_check))))
#endif
#define _libctf_unlikely_(x) __builtin_expect ((x), 0)
#define _libctf_unused_ __attribute__ ((__unused__))
#define _libctf_malloc_ __attribute__((__malloc__))