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Rename several printf attributes declarations to __printf__

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For kernel builds on FreeBSD, we redefine `__printf__` to
`__freebsd_kprintf__`, to support FreeBSD kernel printf(9) extensions
with clang.

In OpenZFS various printf related functions are declared with
`__attribute__((format(printf, X, Y)))`, so these won't work with the
above redefinition. With clang 21 and higher, this leads to errors
similar to:

    sys/contrib/openzfs/module/zfs/spa_misc.c:414:38: error: passing
    'printf' format string where 'freebsd_kprintf' format string is
    expected [-Werror,-Wformat]
      414 |         (void) vsnprintf(buf, sizeof (buf), fmt, adx);
          |                                             ^

Since attribute names can always be spelled with leading and trailing
double underscores, rename these instances.

Note that in the FreeBSD base system we usually use `__printflike` from
`<sys/cdefs.h>`, but that does not apply to OpenZFS.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Dimitry Andric <dimitry@andric.com>
Closes #18095
This commit is contained in:
Dimitry Andric
2026-01-05 23:15:22 +01:00
committed by GitHub
parent 312bdab0f5
commit 2dbd6af5e4
5 changed files with 14 additions and 14 deletions
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include/os/freebsd/spl/sys/kmem.h
+2 -2
View File
@@ -55,9 +55,9 @@ MALLOC_DECLARE(M_SOLARIS);
typedef struct vmem vmem_t;
extern char *kmem_asprintf(const char *, ...)
__attribute__((format(printf, 1, 2)));
__attribute__((format(__printf__, 1, 2)));
extern char *kmem_vasprintf(const char *fmt, va_list ap)
__attribute__((format(printf, 1, 0)));
__attribute__((format(__printf__, 1, 0)));
extern int kmem_scnprintf(char *restrict str, size_t size,
const char *restrict fmt, ...);