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1# intl-thread-locale.m4 serial 9
2dnl Copyright (C) 2015-2023 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6dnl
7dnl This file can be used in projects which are not available under
8dnl the GNU General Public License or the GNU Lesser General Public
9dnl License but which still want to provide support for the GNU gettext
10dnl functionality.
11dnl Please note that the actual code of the GNU gettext library is covered
12dnl by the GNU Lesser General Public License, and the rest of the GNU
13dnl gettext package is covered by the GNU General Public License.
14dnl They are *not* in the public domain.
15
16dnl Check how to retrieve the name of a per-thread locale (POSIX locale_t).
17dnl Sets gt_nameless_locales.
18AC_DEFUN([gt_INTL_THREAD_LOCALE_NAME],
19[
20 AC_REQUIRE([AC_CANONICAL_HOST])
21
22 dnl Persuade Solaris <locale.h> to define 'locale_t'.
23 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
24
25 dnl Test whether uselocale() exists and works at all.
26 gt_FUNC_USELOCALE
27
28 dnl On OpenBSD >= 6.2, the locale_t type and the uselocale(), newlocale(),
29 dnl duplocale(), freelocale() functions exist but are effectively useless,
30 dnl because the locale_t value depends only on the LC_CTYPE category of the
31 dnl locale and furthermore contains only one bit of information (it
32 dnl distinguishes the "C" locale from the *.UTF-8 locales). See
33 dnl <https://cvsweb.openbsd.org/src/lib/libc/locale/newlocale.c?rev=1.1&content-type=text/x-cvsweb-markup>.
34 dnl In the setlocale() implementation they have thought about the programs
35 dnl that use the API ("Even though only LC_CTYPE has any effect in the
36 dnl OpenBSD base system, store complete information about the global locale,
37 dnl such that third-party software can access it"), but for uselocale()
38 dnl they did not think about the programs.
39 dnl In this situation, even the HAVE_NAMELESS_LOCALES support does not work.
40 dnl So, define HAVE_FAKE_LOCALES and disable all locale_t support.
41 case "$gt_cv_func_uselocale_works" in
42 *yes)
43 AC_CHECK_HEADERS_ONCE([xlocale.h])
44 AC_CACHE_CHECK([for fake locale system (OpenBSD)],
45 [gt_cv_locale_fake],
46 [AC_RUN_IFELSE(
47 [AC_LANG_SOURCE([[
48#include <locale.h>
49#if HAVE_XLOCALE_H
50# include <xlocale.h>
51#endif
52int main ()
53{
54 locale_t loc1, loc2;
55 if (setlocale (LC_ALL, "de_DE.UTF-8") == NULL) return 1;
56 if (setlocale (LC_ALL, "fr_FR.UTF-8") == NULL) return 1;
57 loc1 = newlocale (LC_ALL_MASK, "de_DE.UTF-8", (locale_t)0);
58 loc2 = newlocale (LC_ALL_MASK, "fr_FR.UTF-8", (locale_t)0);
59 return !(loc1 == loc2);
60}]])],
61 [gt_cv_locale_fake=yes],
62 [gt_cv_locale_fake=no],
63 [dnl Guess the locale system is fake only on OpenBSD.
64 case "$host_os" in
65 openbsd*) gt_cv_locale_fake="guessing yes" ;;
66 *) gt_cv_locale_fake="guessing no" ;;
67 esac
68 ])
69 ])
70 ;;
71 *) gt_cv_locale_fake=no ;;
72 esac
73 case "$gt_cv_locale_fake" in
74 *yes)
75 gt_fake_locales=yes
76 AC_DEFINE([HAVE_FAKE_LOCALES], [1],
77 [Define if the locale_t type contains insufficient information, as on OpenBSD.])
78 ;;
79 *)
80 gt_fake_locales=no
81 ;;
82 esac
83
84 case "$gt_cv_func_uselocale_works" in
85 *yes)
86 AC_CACHE_CHECK([for Solaris 11.4 locale system],
87 [gt_cv_locale_solaris114],
88 [case "$host_os" in
89 solaris*)
90 dnl Test whether <locale.h> defines locale_t as a typedef of
91 dnl 'struct _LC_locale_t **' (whereas Illumos defines it as a
92 dnl typedef of 'struct _locale *').
93 dnl Another possible test would be to include <sys/localedef.h>
94 dnl and test whether it defines the _LC_core_data_locale_t type.
95 dnl This type was added in Solaris 11.4.
96 AC_COMPILE_IFELSE(
97 [AC_LANG_PROGRAM([[
98 #include <locale.h>
99 struct _LC_locale_t *x;
100 locale_t y;
101 ]],
102 [[*y = x;]])],
103 [gt_cv_locale_solaris114=yes],
104 [gt_cv_locale_solaris114=no])
105 ;;
106 *) gt_cv_locale_solaris114=no ;;
107 esac
108 ])
109 ;;
110 *) gt_cv_locale_solaris114=no ;;
111 esac
112 if test $gt_cv_locale_solaris114 = yes; then
113 AC_DEFINE([HAVE_SOLARIS114_LOCALES], [1],
114 [Define if the locale_t type is as on Solaris 11.4.])
115 fi
116
117 dnl Solaris 12 will maybe provide getlocalename_l. If it does, it will
118 dnl improve the implementation of gl_locale_name_thread(), by removing
119 dnl the use of undocumented structures.
120 case "$gt_cv_func_uselocale_works" in
121 *yes)
122 AC_CHECK_FUNCS([getlocalename_l])
123 ;;
124 esac
125
126 dnl This code is for platforms where the locale_t type does not provide access
127 dnl to the name of each locale category. This code has the drawback that it
128 dnl requires the gnulib overrides of 'newlocale', 'duplocale', 'freelocale',
129 dnl which is a problem for GNU libunistring. Therefore try hard to avoid
130 dnl enabling this code!
131 gt_nameless_locales=no
132 case "$host_os" in
133 dnl It's needed on AIX 7.2.
134 aix*)
135 gt_nameless_locales=yes
136 AC_DEFINE([HAVE_NAMELESS_LOCALES], [1],
137 [Define if the locale_t type does not contain the name of each locale category.])
138 ;;
139 esac
140
141 dnl We cannot support uselocale() on platforms where the locale_t type is
142 dnl fake. So, set
143 dnl gt_good_uselocale = gt_working_uselocale && !gt_fake_locales.
144 if test $gt_working_uselocale = yes && test $gt_fake_locales = no; then
145 gt_good_uselocale=yes
146 AC_DEFINE([HAVE_GOOD_USELOCALE], [1],
147 [Define if the uselocale exists, may be safely called, and returns sufficient information.])
148 else
149 gt_good_uselocale=no
150 fi
151
152 dnl Set gt_localename_enhances_locale_funcs to indicate whether localename.c
153 dnl overrides newlocale(), duplocale(), freelocale() to keep track of locale
154 dnl names.
155 if test $gt_good_uselocale = yes && test $gt_nameless_locales = yes; then
156 gt_localename_enhances_locale_funcs=yes
157 LOCALENAME_ENHANCE_LOCALE_FUNCS=1
158 AC_DEFINE([LOCALENAME_ENHANCE_LOCALE_FUNCS], [1],
159 [Define if localename.c overrides newlocale(), duplocale(), freelocale().])
160 else
161 gt_localename_enhances_locale_funcs=no
162 fi
163])
164
165dnl Tests whether uselocale() exists and is usable.
166dnl Sets gt_working_uselocale and defines HAVE_WORKING_USELOCALE.
167AC_DEFUN([gt_FUNC_USELOCALE],
168[
169 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
170
171 dnl Persuade glibc and Solaris <locale.h> to define 'locale_t'.
172 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
173
174 AC_CHECK_FUNCS_ONCE([uselocale])
175
176 dnl On AIX 7.2, the uselocale() function is not documented and leads to
177 dnl crashes in subsequent setlocale() invocations.
178 dnl In 2019, some versions of z/OS lack the locale_t type and have a broken
179 dnl uselocale function.
180 if test $ac_cv_func_uselocale = yes; then
181 AC_CHECK_HEADERS_ONCE([xlocale.h])
182 AC_CACHE_CHECK([whether uselocale works],
183 [gt_cv_func_uselocale_works],
184 [AC_RUN_IFELSE(
185 [AC_LANG_SOURCE([[
186#include <locale.h>
187#if HAVE_XLOCALE_H
188# include <xlocale.h>
189#endif
190locale_t loc1;
191int main ()
192{
193 uselocale (NULL);
194 setlocale (LC_ALL, "en_US.UTF-8");
195 return 0;
196}]])],
197 [gt_cv_func_uselocale_works=yes],
198 [gt_cv_func_uselocale_works=no],
199 [# Guess no on AIX and z/OS, yes otherwise.
200 case "$host_os" in
201 aix* | openedition*) gt_cv_func_uselocale_works="guessing no" ;;
202 *) gt_cv_func_uselocale_works="guessing yes" ;;
203 esac
204 ])
205 ])
206 else
207 gt_cv_func_uselocale_works=no
208 fi
209 case "$gt_cv_func_uselocale_works" in
210 *yes)
211 gt_working_uselocale=yes
212 AC_DEFINE([HAVE_WORKING_USELOCALE], [1],
213 [Define if the uselocale function exists and may safely be called.])
214 ;;
215 *)
216 gt_working_uselocale=no
217 ;;
218 esac
219])