VirtualBox

source: kBuild/vendor/grep/2.12/m4/getcwd.m4

Last change on this file was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

File size: 4.7 KB
Line 
1# getcwd.m4 - check for working getcwd that is compatible with glibc
2
3# Copyright (C) 2001, 2003-2007, 2009-2012 Free Software Foundation, Inc.
4# This file is free software; the Free Software Foundation
5# gives unlimited permission to copy and/or distribute it,
6# with or without modifications, as long as this notice is preserved.
7
8# Written by Paul Eggert.
9# serial 11
10
11AC_DEFUN([gl_FUNC_GETCWD_NULL],
12 [
13 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
14 AC_CHECK_HEADERS_ONCE([unistd.h])
15 AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
16 [gl_cv_func_getcwd_null],
17 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
18# if HAVE_UNISTD_H
19# include <unistd.h>
20# else /* on Windows with MSVC */
21# include <direct.h>
22# endif
23# ifndef getcwd
24 char *getcwd ();
25# endif
26]], [[
27#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
28/* mingw cwd does not start with '/', but getcwd does allocate.
29 However, mingw fails to honor non-zero size. */
30#else
31 if (chdir ("/") != 0)
32 return 1;
33 else
34 {
35 char *f = getcwd (NULL, 0);
36 if (! f)
37 return 2;
38 if (f[0] != '/')
39 return 3;
40 if (f[1] != '\0')
41 return 4;
42 return 0;
43 }
44#endif
45 ]])],
46 [gl_cv_func_getcwd_null=yes],
47 [gl_cv_func_getcwd_null=no],
48 [[
49 case "$host_os" in
50 # Guess yes on glibc systems.
51 *-gnu*) gl_cv_func_getcwd_null="guessing yes";;
52 # Guess yes on Cygwin.
53 cygwin*) gl_cv_func_getcwd_null="guessing yes";;
54 # If we don't know, assume the worst.
55 *) gl_cv_func_getcwd_null="guessing no";;
56 esac
57 ]])])
58])
59
60AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
61[
62 AC_CACHE_CHECK([for getcwd with POSIX signature],
63 [gl_cv_func_getcwd_posix_signature],
64 [AC_COMPILE_IFELSE(
65 [AC_LANG_PROGRAM(
66 [[#include <unistd.h>]],
67 [[extern
68 #ifdef __cplusplus
69 "C"
70 #endif
71 char *getcwd (char *, size_t);
72 ]])
73 ],
74 [gl_cv_func_getcwd_posix_signature=yes],
75 [gl_cv_func_getcwd_posix_signature=no])
76 ])
77])
78
79dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
80dnl that either the system getcwd is robust, or that calling code is okay
81dnl with spurious failures when run from a directory with an absolute name
82dnl larger than 4k bytes.
83dnl
84dnl Assumes that getcwd exists; if you are worried about obsolete
85dnl platforms that lacked getcwd(), then you need to use the GPL module.
86AC_DEFUN([gl_FUNC_GETCWD_LGPL],
87[
88 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
89 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
90 AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
91
92 case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
93 *yes,yes) ;;
94 *)
95 dnl Minimal replacement lib/getcwd-lgpl.c.
96 REPLACE_GETCWD=1
97 ;;
98 esac
99])
100
101dnl Check for all known getcwd bugs; useful for a program likely to be
102dnl executed from an arbitrary location.
103AC_DEFUN([gl_FUNC_GETCWD],
104[
105 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
106 AC_REQUIRE([gl_FUNC_GETCWD_NULL])
107 AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
108 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
109
110 gl_abort_bug=no
111 case "$host_os" in
112 mingw*)
113 gl_cv_func_getcwd_path_max=yes
114 ;;
115 *)
116 gl_FUNC_GETCWD_PATH_MAX
117 case "$gl_cv_func_getcwd_null" in
118 *yes)
119 gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
120 ;;
121 esac
122 ;;
123 esac
124 dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
125 dnl if appropriate.
126 case "$gl_cv_func_getcwd_path_max" in
127 "no, it has the AIX bug") ;;
128 *)
129 AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
130 [Define to 1 if getcwd minimally works, that is, its result can be
131 trusted when it succeeds.])
132 ;;
133 esac
134 case "$gl_cv_func_getcwd_path_max" in
135 "no, but it is partly working")
136 AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
137 [Define to 1 if getcwd works, except it sometimes fails when it
138 shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
139 ;;
140 esac
141
142 if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
143 || test $gl_cv_func_getcwd_posix_signature != yes \
144 || test "$gl_cv_func_getcwd_path_max" != yes \
145 || test $gl_abort_bug = yes; then
146 REPLACE_GETCWD=1
147 fi
148])
149
150# Prerequisites of lib/getcwd.c, when full replacement is in effect.
151AC_DEFUN([gl_PREREQ_GETCWD],
152[
153 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
154 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
155 :
156])
Note: See TracBrowser for help on using the repository browser.

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette