1 # getcwd.m4 - check for working getcwd that is compatible with glibc
3 # Copyright (C) 2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.
4 # This file is free software; the Free Software Foundation
5 # gives unlimited permission to copy and/or distribute it,
6 # with or without modifications, as long as this notice is preserved.
8 # Written by Paul Eggert.
11 AC_DEFUN([gl_FUNC_GETCWD_NULL],
13 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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);
40 [gl_cv_func_getcwd_null=yes],
41 [gl_cv_func_getcwd_null=no],
44 # Guess yes on glibc systems.
45 *-gnu*) gl_cv_func_getcwd_null="guessing yes";;
46 # Guess yes on Cygwin.
47 cygwin*) gl_cv_func_getcwd_null="guessing yes";;
49 mingw*) gl_cv_func_getcwd_null="guessing yes";;
50 # If we don't know, assume the worst.
51 *) gl_cv_func_getcwd_null="guessing no";;
57 dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
58 dnl that either the system getcwd is robust, or that calling code is okay
59 dnl with spurious failures when run from a directory with an absolute name
60 dnl larger than 4k bytes.
62 dnl Assumes that getcwd exists; if you are worried about obsolete
63 dnl platforms that lacked getcwd(), then you need to use the GPL module.
64 AC_DEFUN([gl_FUNC_GETCWD_LGPL],
66 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
67 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
69 case $gl_cv_func_getcwd_null in
72 dnl Minimal replacement
74 AC_LIBOBJ([getcwd-lgpl])
79 dnl Check for all known getcwd bugs; useful for a program likely to be
80 dnl executed from an arbitrary location.
81 AC_DEFUN([gl_FUNC_GETCWD],
83 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
84 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
85 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
88 case $gl_cv_func_getcwd_null,$host_os in
90 gl_cv_func_getcwd_path_max=yes;;
92 gl_FUNC_GETCWD_PATH_MAX
93 gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);;
96 case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in
99 dnl Full replacement, overrides LGPL replacement.
106 # Prerequisites of lib/getcwd.c, when full replacement is in effect.
107 AC_DEFUN([gl_PREREQ_GETCWD],
109 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
110 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])