1 # canonicalize.m4 serial 37
3 dnl Copyright (C) 2003-2007, 2009-2022 Free Software Foundation, Inc.
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.
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],
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
14 AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
15 AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
16 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
17 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
18 if test $ac_cv_func_canonicalize_file_name = no; then
19 HAVE_CANONICALIZE_FILE_NAME=0
21 case "$gl_cv_func_realpath_works" in
23 *) REPLACE_CANONICALIZE_FILE_NAME=1 ;;
28 # Provides canonicalize_file_name and realpath.
29 AC_DEFUN([gl_CANONICALIZE_LGPL],
31 AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
32 AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
33 if test $ac_cv_func_canonicalize_file_name = no; then
34 HAVE_CANONICALIZE_FILE_NAME=0
35 if test $ac_cv_func_realpath = no; then
38 case "$gl_cv_func_realpath_works" in
40 *) REPLACE_REALPATH=1 ;;
44 case "$gl_cv_func_realpath_works" in
48 REPLACE_CANONICALIZE_FILE_NAME=1
55 # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
56 # (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
57 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
59 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
60 AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
61 AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
63 dnl On native Windows, we use _getcwd(), regardless whether getcwd() is
64 dnl available through the linker option '-loldnames'.
65 AC_REQUIRE([AC_CANONICAL_HOST])
68 *) AC_CHECK_FUNCS([getcwd]) ;;
71 AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
72 AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
73 AC_CHECK_HEADERS_ONCE([sys/param.h])
76 # Check whether realpath works. Assume that if a platform has both
77 # realpath and canonicalize_file_name, but the former is broken, then
79 AC_DEFUN([gl_FUNC_REALPATH_WORKS],
81 AC_CHECK_FUNCS_ONCE([realpath lstat])
82 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
83 AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
84 rm -rf conftest.a conftest.d
86 # Assume that if we have lstat, we can also check symlinks.
87 if test $ac_cv_func_lstat = yes; then
88 ln -s conftest.a conftest.l
99 /* This test fails on Solaris 10. */
101 char *name = realpath ("conftest.a", NULL);
102 if (!(name && *name == '/'))
106 /* This test fails on older versions of Cygwin. */
108 char *name = realpath ("conftest.b/../conftest.a", NULL);
113 /* This test fails on Cygwin 2.9. */
116 char *name = realpath ("conftest.l/../conftest.a", NULL);
117 if (name != NULL || errno != ENOTDIR)
122 /* This test fails on Mac OS X 10.13, OpenBSD 6.0. */
124 char *name = realpath ("conftest.a/", NULL);
129 /* This test fails on AIX 7, Solaris 10. */
131 char *name1 = realpath (".", NULL);
132 char *name2 = realpath ("conftest.d//./..", NULL);
133 if (! name1 || ! name2 || strcmp (name1, name2))
139 /* On Linux, // is the same as /. See also double-slash-root.m4.
140 realpath() should respect this.
141 This test fails on musl libc 1.2.2. */
143 char *name = realpath ("//", NULL);
144 if (! name || strcmp (name, "/"))
152 [gl_cv_func_realpath_works=yes],
154 32) gl_cv_func_realpath_works=nearly ;;
155 *) gl_cv_func_realpath_works=no ;;
159 # Guess yes on glibc systems.
160 *-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;;
161 # Guess 'nearly' on musl systems.
162 *-musl*) gl_cv_func_realpath_works="guessing nearly" ;;
163 # Guess no on Cygwin.
164 cygwin*) gl_cv_func_realpath_works="guessing no" ;;
165 # Guess no on native Windows.
166 mingw*) gl_cv_func_realpath_works="guessing no" ;;
167 # If we don't know, obey --enable-cross-guesses.
168 *) gl_cv_func_realpath_works="$gl_cross_guess_normal" ;;
171 rm -rf conftest.a conftest.l conftest.d
173 case "$gl_cv_func_realpath_works" in
175 AC_DEFINE([FUNC_REALPATH_WORKS], [1],
176 [Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles leading slashes and a trailing slash correctly.])
179 AC_DEFINE([FUNC_REALPATH_NEARLY_WORKS], [1],
180 [Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles a trailing slash correctly.])