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1 office 1 # canonicalize.m4 serial 27
2  
3 dnl Copyright (C) 2003-2007, 2009-2016 Free Software Foundation, Inc.
4  
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
8  
9 # Provides canonicalize_file_name and canonicalize_filename_mode, but does
10 # not provide or fix realpath.
11 AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
12 [
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_CHECK_FUNCS_ONCE([canonicalize_file_name])
15 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
16 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
17 if test $ac_cv_func_canonicalize_file_name = no; then
18 HAVE_CANONICALIZE_FILE_NAME=0
19 else
20 case "$gl_cv_func_realpath_works" in
21 *yes) ;;
22 *) REPLACE_CANONICALIZE_FILE_NAME=1 ;;
23 esac
24 fi
25 ])
26  
27 # Provides canonicalize_file_name and realpath.
28 AC_DEFUN([gl_CANONICALIZE_LGPL],
29 [
30 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
31 AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
32 if test $ac_cv_func_canonicalize_file_name = no; then
33 HAVE_CANONICALIZE_FILE_NAME=0
34 if test $ac_cv_func_realpath = no; then
35 HAVE_REALPATH=0
36 else
37 case "$gl_cv_func_realpath_works" in
38 *yes) ;;
39 *) REPLACE_REALPATH=1 ;;
40 esac
41 fi
42 else
43 case "$gl_cv_func_realpath_works" in
44 *yes)
45 ;;
46 *)
47 REPLACE_CANONICALIZE_FILE_NAME=1
48 REPLACE_REALPATH=1
49 ;;
50 esac
51 fi
52 ])
53  
54 # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
55 # (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
56 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
57 [
58 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
59 AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink])
60 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
61 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
62 AC_CHECK_HEADERS_ONCE([sys/param.h])
63 ])
64  
65 # Check whether realpath works. Assume that if a platform has both
66 # realpath and canonicalize_file_name, but the former is broken, then
67 # so is the latter.
68 AC_DEFUN([gl_FUNC_REALPATH_WORKS],
69 [
70 AC_CHECK_FUNCS_ONCE([realpath])
71 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
72 AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
73 touch conftest.a
74 mkdir conftest.d
75 AC_RUN_IFELSE([
76 AC_LANG_PROGRAM([[
77 ]GL_NOCRASH[
78 #include <stdlib.h>
79 #include <string.h>
80 ]], [[
81 int result = 0;
82 {
83 char *name = realpath ("conftest.a", NULL);
84 if (!(name && *name == '/'))
85 result |= 1;
86 free (name);
87 }
88 {
89 char *name = realpath ("conftest.b/../conftest.a", NULL);
90 if (name != NULL)
91 result |= 2;
92 free (name);
93 }
94 {
95 char *name = realpath ("conftest.a/", NULL);
96 if (name != NULL)
97 result |= 4;
98 free (name);
99 }
100 {
101 char *name1 = realpath (".", NULL);
102 char *name2 = realpath ("conftest.d//./..", NULL);
103 if (! (name1 && name2 && strcmp (name1, name2) != 0))
104 result |= 8;
105 free (name1);
106 free (name2);
107 }
108 return result;
109 ]])
110 ],
111 [gl_cv_func_realpath_works=yes],
112 [gl_cv_func_realpath_works=no],
113 [case "$host_os" in
114 # Guess yes on glibc systems.
115 *-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;;
116 # If we don't know, assume the worst.
117 *) gl_cv_func_realpath_works="guessing no" ;;
118 esac
119 ])
120 rm -rf conftest.a conftest.d
121 ])
122 case "$gl_cv_func_realpath_works" in
123 *yes)
124 AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
125 can malloc memory, always gives an absolute path, and handles
126 trailing slash correctly.])
127 ;;
128 esac
129 ])