1 # getcwd.m4 - check for working getcwd that is compatible with glibc
3 # Copyright (C) 2001, 2003-2007, 2009-2012 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_CHECK_HEADERS_ONCE([unistd.h])
15 AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
16 [gl_cv_func_getcwd_null],
17 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
20 # else /* on Windows with MSVC */
27 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
28 /* mingw cwd does not start with '/', but getcwd does allocate.
29 However, mingw fails to honor non-zero size. */
35 char *f = getcwd (NULL, 0);
46 [gl_cv_func_getcwd_null=yes],
47 [gl_cv_func_getcwd_null=no],
50 # Guess yes on glibc systems.
51 *-gnu*) gl_cv_func_getcwd_null="guessing yes";;
52 # Guess yes on Cygwin.
53 cygwin*) gl_cv_func_getcwd_null="guessing yes";;
54 # If we don't know, assume the worst.
55 *) gl_cv_func_getcwd_null="guessing no";;
60 AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
62 AC_CACHE_CHECK([for getcwd with POSIX signature],
63 [gl_cv_func_getcwd_posix_signature],
66 [[#include <unistd.h>]],
71 char *getcwd (char *, size_t);
74 [gl_cv_func_getcwd_posix_signature=yes],
75 [gl_cv_func_getcwd_posix_signature=no])
79 dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
80 dnl that either the system getcwd is robust, or that calling code is okay
81 dnl with spurious failures when run from a directory with an absolute name
82 dnl larger than 4k bytes.
84 dnl Assumes that getcwd exists; if you are worried about obsolete
85 dnl platforms that lacked getcwd(), then you need to use the GPL module.
86 AC_DEFUN([gl_FUNC_GETCWD_LGPL],
88 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
89 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
90 AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
92 case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
95 dnl Minimal replacement lib/getcwd-lgpl.c.
101 dnl Check for all known getcwd bugs; useful for a program likely to be
102 dnl executed from an arbitrary location.
103 AC_DEFUN([gl_FUNC_GETCWD],
105 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
106 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
107 AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
108 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
113 gl_cv_func_getcwd_path_max=yes
116 gl_FUNC_GETCWD_PATH_MAX
117 case "$gl_cv_func_getcwd_null" in
119 gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
124 dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
126 case "$gl_cv_func_getcwd_path_max" in
127 "no, it has the AIX bug") ;;
129 AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
130 [Define to 1 if getcwd minimally works, that is, its result can be
131 trusted when it succeeds.])
134 case "$gl_cv_func_getcwd_path_max" in
135 "no, but it is partly working")
136 AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
137 [Define to 1 if getcwd works, except it sometimes fails when it
138 shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
142 if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
143 || test $gl_cv_func_getcwd_posix_signature != yes \
144 || test "$gl_cv_func_getcwd_path_max" != yes \
145 || test $gl_abort_bug = yes; then
150 # Prerequisites of lib/getcwd.c, when full replacement is in effect.
151 AC_DEFUN([gl_PREREQ_GETCWD],
153 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
154 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])