2 dnl Copyright (C) 2003, 2007, 2009 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_READLINK],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 AC_CHECK_FUNCS_ONCE([readlink])
11 if test $ac_cv_func_readlink = no; then
16 AC_CACHE_CHECK([whether readlink signature is correct],
17 [gl_cv_decl_readlink_works],
21 /* Cause compilation failure if original declaration has wrong type. */
22 ssize_t readlink (const char *, char *, size_t);]])],
23 [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])])
24 AC_CACHE_CHECK([whether readlink handles trailing slash correctly],
25 [gl_cv_func_readlink_works],
26 [# We have readlink, so assume ln -s works.
27 ln -s conftest.no-such conftest.link
32 return readlink ("conftest.link/", buf, sizeof buf) != -1;]])],
33 [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no],
34 [gl_cv_func_readlink_works="guessing no"])
36 if test "$gl_cv_func_readlink_works" != yes; then
37 AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink
38 fails to recognize a trailing slash.])
41 elif test "$gl_cv_decl_readlink_works" != yes; then
48 # Like gl_FUNC_READLINK, except prepare for separate compilation (no AC_LIBOBJ).
49 AC_DEFUN([gl_FUNC_READLINK_SEPARATE],
51 AC_CHECK_FUNCS_ONCE([readlink])
55 # Prerequisites of lib/readlink.c.
56 AC_DEFUN([gl_PREREQ_READLINK],