Mercurial > gnulib
view m4/fchdir.m4 @ 17249:e542fd46ad6f
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | b187fc49964b |
children | 344018b6e5d7 |
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# fchdir.m4 serial 21 dnl Copyright (C) 2006-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_FCHDIR], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([gl_DIRENT_H_DEFAULTS]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CHECK_DECLS_ONCE([fchdir]) if test $ac_cv_have_decl_fchdir = no; then HAVE_DECL_FCHDIR=0 fi AC_REQUIRE([gl_TEST_FCHDIR]) if test $HAVE_FCHDIR = 0; then AC_LIBOBJ([fchdir]) gl_PREREQ_FCHDIR AC_DEFINE([REPLACE_FCHDIR], [1], [Define to 1 if gnulib's fchdir() replacement is used.]) dnl We must also replace anything that can manipulate a directory fd, dnl to keep our bookkeeping up-to-date. We don't have to replace dnl fstatat, since no platform has fstatat but lacks fchdir. AC_CACHE_CHECK([whether open can visit directories], [gl_cv_func_open_directory_works], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h> ]], [return open(".", O_RDONLY) < 0;])], [gl_cv_func_open_directory_works=yes], [gl_cv_func_open_directory_works=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_open_directory_works="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_open_directory_works="guessing no" ;; esac ])]) case "$gl_cv_func_open_directory_works" in *yes) ;; *) AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should work around the inability to open a directory.]) ;; esac fi ]) # Determine whether to use the overrides in lib/fchdir.c. AC_DEFUN([gl_TEST_FCHDIR], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([fchdir]) if test $ac_cv_func_fchdir = no; then HAVE_FCHDIR=0 fi ]) # Prerequisites of lib/fchdir.c. AC_DEFUN([gl_PREREQ_FCHDIR], [:])