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6a9d7820e6
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
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