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# getcwd.m4 - check for working getcwd that is compatible with glibc
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# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software
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# Copyright (C) 2001, 2003-2007, 2009-2012 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert.
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AC_DEFUN([gl_FUNC_GETCWD_NULL],
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
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[gl_cv_func_getcwd_null],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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# else /* on Windows with MSVC */
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* mingw cwd does not start with '/', but getcwd does allocate. */
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/* mingw cwd does not start with '/', but getcwd does allocate.
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However, mingw fails to honor non-zero size. */
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if (chdir ("/") != 0)
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char *f = getcwd (NULL, 0);
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return ! (f && f[0] == '/' && !f[1]);
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[gl_cv_func_getcwd_null=yes],
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[gl_cv_func_getcwd_null=no],
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# Guess yes on glibc systems.
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*-gnu*) gl_cv_func_getcwd_null="guessing yes";;
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# Guess yes on Cygwin.
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cygwin*) gl_cv_func_getcwd_null="guessing yes";;
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mingw*) gl_cv_func_getcwd_null="guessing yes";;
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# If we don't know, assume the worst.
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*) gl_cv_func_getcwd_null="guessing no";;
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# Guess yes on glibc systems.
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*-gnu*) gl_cv_func_getcwd_null="guessing yes";;
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# Guess yes on Cygwin.
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cygwin*) gl_cv_func_getcwd_null="guessing yes";;
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# If we don't know, assume the worst.
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*) gl_cv_func_getcwd_null="guessing no";;
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AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
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AC_CACHE_CHECK([for getcwd with POSIX signature],
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[gl_cv_func_getcwd_posix_signature],
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[[#include <unistd.h>]],
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char *getcwd (char *, size_t);
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[gl_cv_func_getcwd_posix_signature=yes],
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[gl_cv_func_getcwd_posix_signature=no])
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dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
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dnl that either the system getcwd is robust, or that calling code is okay
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dnl with spurious failures when run from a directory with an absolute name
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dnl larger than 4k bytes.
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dnl Assumes that getcwd exists; if you are worried about obsolete
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dnl platforms that lacked getcwd(), then you need to use the GPL module.
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AC_DEFUN([gl_FUNC_GETCWD_LGPL],
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_GETCWD_NULL])
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AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
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case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
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dnl Minimal replacement lib/getcwd-lgpl.c.
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dnl Check for all known getcwd bugs; useful for a program likely to be
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dnl executed from an arbitrary location.
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AC_DEFUN([gl_FUNC_GETCWD],
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_GETCWD_NULL])
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AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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case $gl_cv_func_getcwd_null,$host_os in
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gl_cv_func_getcwd_path_max=yes;;
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gl_FUNC_GETCWD_PATH_MAX
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gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);;
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gl_cv_func_getcwd_path_max=yes
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gl_FUNC_GETCWD_PATH_MAX
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case "$gl_cv_func_getcwd_null" in
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gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
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dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
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case "$gl_cv_func_getcwd_path_max" in
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"no, it has the AIX bug") ;;
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AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
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[Define to 1 if getcwd minimally works, that is, its result can be
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trusted when it succeeds.])
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case "$gl_cv_func_getcwd_path_max" in
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"no, but it is partly working")
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AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
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[Define to 1 if getcwd works, except it sometimes fails when it
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shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
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case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max,$gl_abort_bug in
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if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
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|| test $gl_cv_func_getcwd_posix_signature != yes \
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|| test "$gl_cv_func_getcwd_path_max" != yes \
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|| test $gl_abort_bug = yes; then
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# Prerequisites of lib/getcwd.c.
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# Prerequisites of lib/getcwd.c, when full replacement is in effect.
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AC_DEFUN([gl_PREREQ_GETCWD],
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])