1 # getcwd.m4 - check for working getcwd that is compatible with glibc
3 # Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009 Free Software
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
9 # Written by Paul Eggert.
12 AC_DEFUN([gl_FUNC_GETCWD_NULL],
14 AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
15 [gl_cv_func_getcwd_null],
16 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
22 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
23 /* mingw cwd does not start with '/', but getcwd does allocate. */
29 char *f = getcwd (NULL, 0);
30 return ! (f && f[0] == '/' && !f[1]);
34 [gl_cv_func_getcwd_null=yes],
35 [gl_cv_func_getcwd_null=no],
38 # Guess yes on glibc systems.
39 *-gnu*) gl_cv_func_getcwd_null="guessing yes";;
40 # Guess yes on Cygwin.
41 cygwin*) gl_cv_func_getcwd_null="guessing yes";;
43 mingw*) gl_cv_func_getcwd_null="guessing yes";;
44 # If we don't know, assume the worst.
45 *) gl_cv_func_getcwd_null="guessing no";;
50 AC_DEFUN([gl_FUNC_GETCWD],
52 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
53 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
54 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
57 case $gl_cv_func_getcwd_null,$host_os in
59 gl_cv_func_getcwd_path_max=yes;;
61 gl_FUNC_GETCWD_PATH_MAX
62 gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);;
65 case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in
74 # Prerequisites of lib/getcwd.c.
75 AC_DEFUN([gl_PREREQ_GETCWD],
77 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
78 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])