2 # See if we need to provide symlinkat replacement.
4 dnl Copyright (C) 2009-2015 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
9 # Written by Eric Blake.
11 AC_DEFUN([gl_FUNC_SYMLINKAT],
13 AC_REQUIRE([gl_FUNC_OPENAT])
14 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
16 AC_CHECK_FUNCS_ONCE([symlinkat])
17 if test $ac_cv_func_symlinkat = no; then
20 AC_CACHE_CHECK([whether symlinkat handles trailing slash correctly],
21 [gl_cv_func_symlinkat_works],
28 if (!symlinkat ("a", AT_FDCWD, "conftest.link/"))
30 if (symlinkat ("conftest.f", AT_FDCWD, "conftest.lnk2"))
32 else if (!symlinkat ("a", AT_FDCWD, "conftest.lnk2/"))
36 [gl_cv_func_symlinkat_works=yes],
37 [gl_cv_func_symlinkat_works=no],
39 # Guess yes on glibc systems.
40 *-gnu*) gl_cv_func_symlinkat_works="guessing yes" ;;
41 # If we don't know, assume the worst.
42 *) gl_cv_func_symlinkat_works="guessing no" ;;
45 rm -f conftest.f conftest.link conftest.lnk2])
46 case "$gl_cv_func_symlinkat_works" in