1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768 |
- # fchdir.m4 serial 26
- dnl Copyright (C) 2006-2021 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 $HAVE_FCHDIR = 0; then
- AC_LIBOBJ([fchdir])
- gl_PREREQ_FCHDIR
- AC_DEFINE([REPLACE_FCHDIR], [1],
- [Define to 1 if gnulib's fchdir() replacement is used.])
- dnl We must also replace anything that can manipulate a directory fd,
- dnl to keep our bookkeeping up-to-date. We don't have to replace
- dnl fstatat, since no platform has fstatat but lacks fchdir.
- AC_CACHE_CHECK([whether open can visit directories],
- [gl_cv_func_open_directory_works],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <fcntl.h>
- ]GL_MDA_DEFINES],
- [[return open(".", O_RDONLY) < 0;]])],
- [gl_cv_func_open_directory_works=yes],
- [gl_cv_func_open_directory_works=no],
- [case "$host_os" in
- # Guess yes on Linux systems.
- linux-* | linux) gl_cv_func_open_directory_works="guessing yes" ;;
- # Guess yes on glibc systems.
- *-gnu* | gnu*) gl_cv_func_open_directory_works="guessing yes" ;;
- # Guess no on native Windows.
- mingw*) gl_cv_func_open_directory_works="guessing no" ;;
- # If we don't know, obey --enable-cross-guesses.
- *) gl_cv_func_open_directory_works="$gl_cross_guess_normal" ;;
- esac
- ])])
- case "$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], [:])
|