2 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_LINK],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 AC_CHECK_FUNCS_ONCE([link])
11 if test $ac_cv_func_link = no; then
14 AC_CACHE_CHECK([whether link obeys POSIX],
15 [gl_cv_func_link_works],
17 # Assume that if we have lstat, we can also check symlinks.
18 if test $ac_cv_func_lstat = yes; then
19 ln -s conftest.a conftest.lnk
26 if (!link ("conftest.a", "conftest.b/"))
29 if (!link ("conftest.lnk/", "conftest.b"))
31 if (rename ("conftest.a", "conftest.b"))
33 if (!link ("conftest.b", "conftest.lnk"))
38 [gl_cv_func_link_works=yes], [gl_cv_func_link_works=no],
39 [gl_cv_func_link_works="guessing no"])
40 rm -f conftest.a conftest.b conftest.lnk])
41 if test "$gl_cv_func_link_works" != yes; then