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# fdatasync.m4
# serial 9
dnl Copyright (C) 2008-2025 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_FDATASYNC],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS
AC_CHECK_DECLS_ONCE([fdatasync])
FDATASYNC_LIB=
AC_SUBST([FDATASYNC_LIB])
if test $ac_cv_have_decl_fdatasync = no; then
HAVE_DECL_FDATASYNC=0
dnl Mac OS X 10.7 has fdatasync but does not declare it.
dnl Likewise Android with API level < 9.
gl_CHECK_FUNCS_ANDROID([fdatasync], [[#include <unistd.h>]])
if test $ac_cv_func_fdatasync = no; then
HAVE_FDATASYNC=0
case "$gl_cv_onwards_func_fdatasync" in
future*) REPLACE_FDATASYNC=1 ;;
esac
fi
else
case "$host_os" in
solaris*)
dnl Solaris <= 2.6 has fdatasync() in libposix4.
dnl Solaris 7..9 has it in librt.
dnl Solaris 10 sometimes has it in librt <https://bugs.gnu.org/21059>.
gl_saved_libs=$LIBS
AC_SEARCH_LIBS([fdatasync], [rt posix4],
[test "$ac_cv_search_fdatasync" = "none required" ||
FDATASYNC_LIB=$ac_cv_search_fdatasync])
LIBS=$gl_saved_libs
;;
*)
dnl Android 4.3 does not have fdatasync but declares it, and future
dnl Android versions have it.
gl_CHECK_FUNCS_ANDROID([fdatasync], [[#include <unistd.h>]])
if test $ac_cv_func_fdatasync = no; then
HAVE_FDATASYNC=0
case "$gl_cv_onwards_func_fdatasync" in
future*) REPLACE_FDATASYNC=1 ;;
esac
fi
;;
esac
fi
dnl For backward compatibility.
LIB_FDATASYNC="$FDATASYNC_LIB"
AC_SUBST([LIB_FDATASYNC])
])
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