68 lines
2.4 KiB
Text
68 lines
2.4 KiB
Text
# fchdir.m4 serial 26
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dnl Copyright (C) 2006-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_FCHDIR],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_DECLS_ONCE([fchdir])
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if test $ac_cv_have_decl_fchdir = no; then
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HAVE_DECL_FCHDIR=0
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fi
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AC_REQUIRE([gl_TEST_FCHDIR])
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if test $HAVE_FCHDIR = 0; then
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AC_LIBOBJ([fchdir])
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gl_PREREQ_FCHDIR
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AC_DEFINE([REPLACE_FCHDIR], [1],
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[Define to 1 if gnulib's fchdir() replacement is used.])
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dnl We must also replace anything that can manipulate a directory fd,
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dnl to keep our bookkeeping up-to-date. We don't have to replace
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dnl fstatat, since no platform has fstatat but lacks fchdir.
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AC_CACHE_CHECK([whether open can visit directories],
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[gl_cv_func_open_directory_works],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <fcntl.h>
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]GL_MDA_DEFINES],
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[[return open(".", O_RDONLY) < 0;]])],
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[gl_cv_func_open_directory_works=yes],
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[gl_cv_func_open_directory_works=no],
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[case "$host_os" in
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# Guess yes on Linux systems.
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linux-* | linux) gl_cv_func_open_directory_works="guessing yes" ;;
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_open_directory_works="guessing yes" ;;
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# Guess no on native Windows.
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mingw*) gl_cv_func_open_directory_works="guessing no" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_open_directory_works="$gl_cross_guess_normal" ;;
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esac
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])])
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case "$gl_cv_func_open_directory_works" in
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*yes) ;;
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*)
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AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
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work around the inability to open a directory.])
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;;
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esac
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fi
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])
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# Determine whether to use the overrides in lib/fchdir.c.
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AC_DEFUN([gl_TEST_FCHDIR],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_CHECK_FUNCS_ONCE([fchdir])
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if test $ac_cv_func_fchdir = no; then
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HAVE_FCHDIR=0
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fi
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])
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# Prerequisites of lib/fchdir.c.
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AC_DEFUN([gl_PREREQ_FCHDIR], [:])
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