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# AX_CHECK_MOUNT_OPT: an autoconf macro to check for generic filesystem-
# agnostic 'mount' options. Originally written by Nicholas Clark, and
# modified by Theodore Ts'o to use more modern autoconf macros.
#
# Looks for constants in sys/mount.h to predict whether the 'mount'
# utility will support a specific mounting option.
#
# This macro can be used to check for the presence of 'nodev' (or other mount
# options), which isn't uniformly implemented in the BSD family at the time of
# this writing. Tested on FreeBSD, NetBSD, OpenBSD, and Linux.
#
# Usage:
#
# AX_CHECK_MOUNT_OPT(option)
#
# Defines HAVE_MOUNT_$OPTION (in uppercase) if the option exists, and sets
# ac_cv_mount_$option (in original case) otherwise.
#
# Copyright (c) 2018 Nicholas Clark <nicholas.clark@gmail.com>
# Copyright (c) 2025 Theodore Ts'o <tytso@alum.mit.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty or attribution requirement.
AC_DEFUN([AX_CHECK_MOUNT_OPT], [__AX_CHECK_MOUNT_OPT(m4_tolower([$1]),m4_toupper([$1]))])
AC_DEFUN([__AX_CHECK_MOUNT_OPT],
[
AC_MSG_CHECKING([for mount '$1' option])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <sys/mount.h>
int main(int argc, char **argv) {
void *temp = (void *)(MS_$2);
(void) temp;
return 0;
}
]])],[
AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
AS_VAR_SET(ac_cv_mount_$1, yes)
AC_MSG_RESULT([yes])],[
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#include <sys/mount.h>
int main(int argc, char **argv) {
void *temp = (void *)(MNT_$2);
(void) temp;
return 0;
}
]])],[
AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
AS_VAR_SET(ac_cv_mount_$1, yes)
AC_MSG_RESULT([yes])],[
AC_MSG_RESULT([no])])
])
])
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