projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 9c9d63b1 PM |
1 | # fchdir.m4 serial 26 |
| 2 | dnl Copyright (C) 2006-2021 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 $HAVE_FCHDIR = 0; then | |
| 20 | AC_LIBOBJ([fchdir]) | |
| 21 | gl_PREREQ_FCHDIR | |
| 22 | AC_DEFINE([REPLACE_FCHDIR], [1], | |
| 23 | [Define to 1 if gnulib's fchdir() replacement is used.]) | |
| 24 | dnl We must also replace anything that can manipulate a directory fd, | |
| 25 | dnl to keep our bookkeeping up-to-date. We don't have to replace | |
| 26 | dnl fstatat, since no platform has fstatat but lacks fchdir. | |
| 27 | AC_CACHE_CHECK([whether open can visit directories], | |
| 28 | [gl_cv_func_open_directory_works], | |
| 9c9d63b1 PM |
29 | [AC_RUN_IFELSE( |
| 30 | [AC_LANG_PROGRAM( | |
| 31 | [[#include <fcntl.h> | |
| 32 | ]GL_MDA_DEFINES], | |
| 33 | [[return open(".", O_RDONLY) < 0;]])], | |
| 34 | [gl_cv_func_open_directory_works=yes], | |
| 35 | [gl_cv_func_open_directory_works=no], | |
| 36 | [case "$host_os" in | |
| 37 | # Guess yes on Linux systems. | |
| 38 | linux-* | linux) gl_cv_func_open_directory_works="guessing yes" ;; | |
| 39 | # Guess yes on glibc systems. | |
| 40 | *-gnu* | gnu*) gl_cv_func_open_directory_works="guessing yes" ;; | |
| 41 | # Guess no on native Windows. | |
| 42 | mingw*) gl_cv_func_open_directory_works="guessing no" ;; | |
| 43 | # If we don't know, obey --enable-cross-guesses. | |
| 44 | *) gl_cv_func_open_directory_works="$gl_cross_guess_normal" ;; | |
| 45 | esac | |
| 46 | ])]) | |
| 6ec2e0f5 SDJ |
47 | case "$gl_cv_func_open_directory_works" in |
| 48 | *yes) ;; | |
| 49 | *) | |
| 50 | AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should | |
| 51 | work around the inability to open a directory.]) | |
| 52 | ;; | |
| 53 | esac | |
| 54 | fi | |
| 55 | ]) | |
| 56 | ||
| 57 | # Determine whether to use the overrides in lib/fchdir.c. | |
| 58 | AC_DEFUN([gl_TEST_FCHDIR], | |
| 59 | [ | |
| 60 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
| 61 | AC_CHECK_FUNCS_ONCE([fchdir]) | |
| 62 | if test $ac_cv_func_fchdir = no; then | |
| 63 | HAVE_FCHDIR=0 | |
| 64 | fi | |
| 65 | ]) | |
| 66 | ||
| 67 | # Prerequisites of lib/fchdir.c. | |
| 68 | AC_DEFUN([gl_PREREQ_FCHDIR], [:]) |