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6ec2e0f5 SDJ |
1 | # getcwd.m4 - check for working getcwd that is compatible with glibc |
2 | ||
c0c3707f | 3 | # Copyright (C) 2001, 2003-2007, 2009-2019 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
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. | |
c0c3707f | 9 | # serial 18 |
6ec2e0f5 SDJ |
10 | |
11 | AC_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 | # include <stdlib.h> | |
19 | # if HAVE_UNISTD_H | |
20 | # include <unistd.h> | |
21 | # else /* on Windows with MSVC */ | |
22 | # include <direct.h> | |
23 | # endif | |
24 | # ifndef getcwd | |
25 | char *getcwd (); | |
26 | # endif | |
27 | ]], [[ | |
c0c3707f | 28 | #if defined _WIN32 && ! defined __CYGWIN__ |
6ec2e0f5 SDJ |
29 | /* mingw cwd does not start with '/', but getcwd does allocate. |
30 | However, mingw fails to honor non-zero size. */ | |
31 | #else | |
32 | if (chdir ("/") != 0) | |
33 | return 1; | |
34 | else | |
35 | { | |
36 | char *f = getcwd (NULL, 0); | |
37 | if (! f) | |
38 | return 2; | |
39 | if (f[0] != '/') | |
c0c3707f | 40 | { free (f); return 3; } |
6ec2e0f5 | 41 | if (f[1] != '\0') |
c0c3707f | 42 | { free (f); return 4; } |
6ec2e0f5 SDJ |
43 | free (f); |
44 | return 0; | |
45 | } | |
46 | #endif | |
47 | ]])], | |
48 | [gl_cv_func_getcwd_null=yes], | |
49 | [gl_cv_func_getcwd_null=no], | |
50 | [[case "$host_os" in | |
c0c3707f CB |
51 | # Guess yes on glibc systems. |
52 | *-gnu* | gnu*) gl_cv_func_getcwd_null="guessing yes";; | |
53 | # Guess yes on musl systems. | |
54 | *-musl*) gl_cv_func_getcwd_null="guessing yes";; | |
55 | # Guess yes on Cygwin. | |
56 | cygwin*) gl_cv_func_getcwd_null="guessing yes";; | |
57 | # If we don't know, obey --enable-cross-guesses. | |
58 | *) gl_cv_func_getcwd_null="$gl_cross_guess_normal";; | |
6ec2e0f5 SDJ |
59 | esac |
60 | ]])]) | |
61 | ]) | |
62 | ||
63 | AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE], | |
64 | [ | |
65 | AC_CACHE_CHECK([for getcwd with POSIX signature], | |
66 | [gl_cv_func_getcwd_posix_signature], | |
67 | [AC_COMPILE_IFELSE( | |
68 | [AC_LANG_PROGRAM( | |
69 | [[#include <unistd.h>]], | |
70 | [[extern | |
71 | #ifdef __cplusplus | |
72 | "C" | |
73 | #endif | |
74 | char *getcwd (char *, size_t); | |
75 | ]]) | |
76 | ], | |
77 | [gl_cv_func_getcwd_posix_signature=yes], | |
78 | [gl_cv_func_getcwd_posix_signature=no]) | |
79 | ]) | |
80 | ]) | |
81 | ||
82 | dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes | |
83 | dnl that either the system getcwd is robust, or that calling code is okay | |
84 | dnl with spurious failures when run from a directory with an absolute name | |
85 | dnl larger than 4k bytes. | |
86 | dnl | |
87 | dnl Assumes that getcwd exists; if you are worried about obsolete | |
88 | dnl platforms that lacked getcwd(), then you need to use the GPL module. | |
89 | AC_DEFUN([gl_FUNC_GETCWD_LGPL], | |
90 | [ | |
91 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
92 | AC_REQUIRE([gl_FUNC_GETCWD_NULL]) | |
93 | AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) | |
94 | ||
95 | case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in | |
96 | *yes,yes) ;; | |
97 | *) | |
98 | dnl Minimal replacement lib/getcwd-lgpl.c. | |
99 | REPLACE_GETCWD=1 | |
100 | ;; | |
101 | esac | |
102 | ]) | |
103 | ||
104 | dnl Check for all known getcwd bugs; useful for a program likely to be | |
105 | dnl executed from an arbitrary location. | |
106 | AC_DEFUN([gl_FUNC_GETCWD], | |
107 | [ | |
108 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
109 | AC_REQUIRE([gl_FUNC_GETCWD_NULL]) | |
110 | AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) | |
111 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
112 | ||
113 | gl_abort_bug=no | |
114 | case "$host_os" in | |
115 | mingw*) | |
116 | gl_cv_func_getcwd_path_max=yes | |
117 | ;; | |
118 | *) | |
119 | gl_FUNC_GETCWD_PATH_MAX | |
120 | case "$gl_cv_func_getcwd_null" in | |
121 | *yes) | |
122 | gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]) | |
123 | ;; | |
124 | esac | |
125 | ;; | |
126 | esac | |
127 | dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD | |
128 | dnl if appropriate. | |
129 | case "$gl_cv_func_getcwd_path_max" in | |
c0c3707f | 130 | *"no" | *"no, it has the AIX bug") ;; |
6ec2e0f5 SDJ |
131 | *) |
132 | AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1], | |
133 | [Define to 1 if getcwd minimally works, that is, its result can be | |
134 | trusted when it succeeds.]) | |
135 | ;; | |
136 | esac | |
137 | case "$gl_cv_func_getcwd_path_max" in | |
c0c3707f | 138 | *"no, but it is partly working") |
6ec2e0f5 SDJ |
139 | AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1], |
140 | [Define to 1 if getcwd works, except it sometimes fails when it | |
141 | shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.]) | |
142 | ;; | |
c0c3707f | 143 | *"yes, but with shorter paths") |
6ec2e0f5 SDJ |
144 | AC_DEFINE([HAVE_GETCWD_SHORTER], [1], |
145 | [Define to 1 if getcwd works, but with shorter paths | |
146 | than is generally tested with the replacement.]) | |
147 | ;; | |
148 | esac | |
149 | ||
150 | if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \ | |
151 | || test $gl_cv_func_getcwd_posix_signature != yes \ | |
152 | || { case "$gl_cv_func_getcwd_path_max" in *yes*) false;; *) true;; esac; } \ | |
153 | || test $gl_abort_bug = yes; then | |
154 | REPLACE_GETCWD=1 | |
155 | fi | |
156 | ]) | |
157 | ||
158 | # Prerequisites of lib/getcwd.c, when full replacement is in effect. | |
159 | AC_DEFUN([gl_PREREQ_GETCWD], | |
160 | [ | |
161 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
162 | AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO]) | |
163 | : | |
164 | ]) |