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config: fix STATX_MNT_ID detection

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statx(2) requires _GNU_SOURCE to be defined in order for sys/stat.h to
produce a definition for struct statx and the STATX_* defines. We get
that at compile time because we pass -D_GNU_SOURCE through to
everything, but in the configure check we aren't setting _GNU_SOURCE, so
we don't find STATX_MNT_ID, and so don't set HAVE_STATX_MNT_ID.

(This was fine before ccf5a8a6fc, because linux/stat.h does not require
_GNU_SOURCE).

Simple fix: in the check, define _GNU_SOURCE before including
sys/stat.h.

Sponsored-by: TrueNAS
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@truenas.com>
Closes #18312
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Rob Norris 2026-03-13 03:58:54 +11:00 committed by GitHub
parent cff853cec5
commit 2b930f63f8
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config/user-statx.m4
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@ -15,6 +15,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER_STATX], [
AC_MSG_CHECKING([for STATX_MNT_ID])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#define _GNU_SOURCE
#include <sys/stat.h>
]], [[
struct statx stx;