1# intl-thread-locale.m4 serial 8
2dnl Copyright (C) 2015-2020 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 "$gt_cv_locale_fake" in
74    *yes)
75      AC_DEFINE([HAVE_FAKE_LOCALES], [1],
76        [Define if the locale_t type contains insufficient information, as on OpenBSD.])
77      ;;
78  esac
79
80  case "$gt_cv_func_uselocale_works" in
81    *yes)
82      AC_CACHE_CHECK([for Solaris 11.4 locale system],
83        [gt_cv_locale_solaris114],
84        [case "$host_os" in
85           solaris*)
86             dnl Test whether <locale.h> defines locale_t as a typedef of
87             dnl 'struct _LC_locale_t **' (whereas Illumos defines it as a
88             dnl typedef of 'struct _locale *').
89             dnl Another possible test would be to include <sys/localedef.h>
90             dnl and test whether it defines the _LC_core_data_locale_t type.
91             dnl This type was added in Solaris 11.4.
92             AC_COMPILE_IFELSE(
93               [AC_LANG_PROGRAM([[
94                  #include <locale.h>
95                  struct _LC_locale_t *x;
96                  locale_t y;
97                ]],
98                [[*y = x;]])],
99               [gt_cv_locale_solaris114=yes],
100               [gt_cv_locale_solaris114=no])
101             ;;
102           *) gt_cv_locale_solaris114=no ;;
103         esac
104        ])
105      ;;
106    *) gt_cv_locale_solaris114=no ;;
107  esac
108  if test $gt_cv_locale_solaris114 = yes; then
109    AC_DEFINE([HAVE_SOLARIS114_LOCALES], [1],
110      [Define if the locale_t type is as on Solaris 11.4.])
111  fi
112
113  dnl Solaris 12 will maybe provide getlocalename_l.  If it does, it will
114  dnl improve the implementation of gl_locale_name_thread(), by removing
115  dnl the use of undocumented structures.
116  case "$gt_cv_func_uselocale_works" in
117    *yes)
118      AC_CHECK_FUNCS([getlocalename_l])
119      ;;
120  esac
121
122  dnl This code is for platforms where the locale_t type does not provide access
123  dnl to the name of each locale category.  This code has the drawback that it
124  dnl requires the gnulib overrides of 'newlocale', 'duplocale', 'freelocale',
125  dnl which is a problem for GNU libunistring.  Therefore try hard to avoid
126  dnl enabling this code!
127  gt_nameless_locales=no
128  case "$host_os" in
129    dnl It's needed on AIX 7.2.
130    aix*)
131      gt_nameless_locales=yes
132      AC_DEFINE([HAVE_NAMELESS_LOCALES], [1],
133        [Define if the locale_t type does not contain the name of each locale category.])
134      ;;
135  esac
136])
137
138dnl Tests whether uselocale() exists and is usable.
139dnl Sets gt_cv_func_uselocale_works. Defines HAVE_WORKING_USELOCALE.
140AC_DEFUN([gt_FUNC_USELOCALE],
141[
142  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
143
144  dnl Persuade glibc and Solaris <locale.h> to define 'locale_t'.
145  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
146
147  AC_CHECK_FUNCS_ONCE([uselocale])
148
149  dnl On AIX 7.2, the uselocale() function is not documented and leads to
150  dnl crashes in subsequent setlocale() invocations.
151  dnl In 2019, some versions of z/OS lack the locale_t type and have a broken
152  dnl uselocale function.
153  if test $ac_cv_func_uselocale = yes; then
154    AC_CHECK_HEADERS_ONCE([xlocale.h])
155    AC_CACHE_CHECK([whether uselocale works],
156      [gt_cv_func_uselocale_works],
157      [AC_RUN_IFELSE(
158         [AC_LANG_SOURCE([[
159#include <locale.h>
160#if HAVE_XLOCALE_H
161# include <xlocale.h>
162#endif
163locale_t loc1;
164int main ()
165{
166  uselocale (NULL);
167  setlocale (LC_ALL, "en_US.UTF-8");
168  return 0;
169}]])],
170         [gt_cv_func_uselocale_works=yes],
171         [gt_cv_func_uselocale_works=no],
172         [# Guess no on AIX and z/OS, yes otherwise.
173          case "$host_os" in
174            aix* | openedition*) gt_cv_func_uselocale_works="guessing no" ;;
175            *)                   gt_cv_func_uselocale_works="guessing yes" ;;
176          esac
177         ])
178      ])
179  else
180    gt_cv_func_uselocale_works=no
181  fi
182  case "$gt_cv_func_uselocale_works" in
183    *yes)
184      AC_DEFINE([HAVE_WORKING_USELOCALE], [1],
185        [Define if the uselocale function exists any may safely be called.])
186      ;;
187  esac
188])
189