projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 5e8754f9 SDJ |
1 | # fchdir.m4 serial 21 |
| 2 | dnl Copyright (C) 2006-2016 Free Software Foundation, Inc. | |
| 6ec2e0f5 SDJ |
3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 6 | ||
| 7 | AC_DEFUN([gl_FUNC_FCHDIR], | |
| 8 | [ | |
| 9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
| 10 | AC_REQUIRE([gl_DIRENT_H_DEFAULTS]) | |
| 11 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
| 12 | ||
| 13 | AC_CHECK_DECLS_ONCE([fchdir]) | |
| 14 | if test $ac_cv_have_decl_fchdir = no; then | |
| 15 | HAVE_DECL_FCHDIR=0 | |
| 16 | fi | |
| 17 | ||
| 18 | AC_REQUIRE([gl_TEST_FCHDIR]) | |
| 19 | if test $HAVE_FCHDIR = 0; then | |
| 20 | AC_LIBOBJ([fchdir]) | |
| 21 | gl_PREREQ_FCHDIR | |
| 22 | AC_DEFINE([REPLACE_FCHDIR], [1], | |
| 23 | [Define to 1 if gnulib's fchdir() replacement is used.]) | |
| 24 | dnl We must also replace anything that can manipulate a directory fd, | |
| 25 | dnl to keep our bookkeeping up-to-date. We don't have to replace | |
| 26 | dnl fstatat, since no platform has fstatat but lacks fchdir. | |
| 27 | AC_CACHE_CHECK([whether open can visit directories], | |
| 28 | [gl_cv_func_open_directory_works], | |
| 29 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h> | |
| 30 | ]], [return open(".", O_RDONLY) < 0;])], | |
| 31 | [gl_cv_func_open_directory_works=yes], | |
| 32 | [gl_cv_func_open_directory_works=no], | |
| 33 | [case "$host_os" in | |
| 5e8754f9 SDJ |
34 | # Guess yes on glibc systems. |
| 35 | *-gnu*) gl_cv_func_open_directory_works="guessing yes" ;; | |
| 36 | # If we don't know, assume the worst. | |
| 37 | *) gl_cv_func_open_directory_works="guessing no" ;; | |
| 6ec2e0f5 SDJ |
38 | esac |
| 39 | ])]) | |
| 40 | case "$gl_cv_func_open_directory_works" in | |
| 41 | *yes) ;; | |
| 42 | *) | |
| 43 | AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should | |
| 44 | work around the inability to open a directory.]) | |
| 45 | ;; | |
| 46 | esac | |
| 47 | fi | |
| 48 | ]) | |
| 49 | ||
| 50 | # Determine whether to use the overrides in lib/fchdir.c. | |
| 51 | AC_DEFUN([gl_TEST_FCHDIR], | |
| 52 | [ | |
| 53 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
| 54 | AC_CHECK_FUNCS_ONCE([fchdir]) | |
| 55 | if test $ac_cv_func_fchdir = no; then | |
| 56 | HAVE_FCHDIR=0 | |
| 57 | fi | |
| 58 | ]) | |
| 59 | ||
| 60 | # Prerequisites of lib/fchdir.c. | |
| 61 | AC_DEFUN([gl_PREREQ_FCHDIR], [:]) |