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# renameat.m4
# serial 5
dnl Copyright (C) 2009-2024 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.
# See if we need to provide renameat replacement.
# Written by Eric Blake.
AC_DEFUN([gl_FUNC_RENAMEAT],
[
AC_REQUIRE([gl_FUNC_OPENAT])
AC_REQUIRE([gl_FUNC_RENAME])
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS([linux/fs.h])
AC_CHECK_FUNCS_ONCE([renameat])
if test $ac_cv_func_renameat = no; then
HAVE_RENAMEAT=0
elif test $REPLACE_RENAME = 1; then
dnl Solaris 9 and 10 have the same bugs in renameat as in rename.
REPLACE_RENAMEAT=1
fi
gl_CHECK_FUNCS_ANDROID([renameat2], [[#include <stdio.h>]])
if test $ac_cv_func_renameat2 = yes; then
AC_CACHE_CHECK([whether renameat2 works],
[gl_cv_func_renameat2_works],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <fcntl.h>
#include <stdio.h>
int main ()
{
/* This test fails on Cygwin 3.4.6. */
if (renameat2 (AT_FDCWD, "conftest.c", AT_FDCWD, "conftest.c",
RENAME_NOREPLACE) == 0)
return 1;
return 0;
}
]])],
[gl_cv_func_renameat2_works=yes],
[gl_cv_func_renameat2_works=no],
[case "$host_os" in
# Guess yes on Linux.
linux*) gl_cv_func_renameat2_works="guessing yes" ;;
# Guess no on Cygwin.
cygwin*) gl_cv_func_renameat2_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_renameat2_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_renameat2_works" in
*yes)
AC_DEFINE([HAVE_WORKING_RENAMEAT2], [1],
[Define if the renameat2 function exists and it works.])
;;
esac
fi
])
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