1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
3 dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 dnl Written by Eric Blake.
10 # wchar_h.m4 serial 39
12 AC_DEFUN([gl_WCHAR_H],
14 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
15 AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
16 dnl Prepare for creating substitute <wchar.h>.
17 dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
18 dnl character support).
19 dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
20 gl_CHECK_NEXT_HEADERS([wchar.h])
21 if test $ac_cv_header_wchar_h = yes; then
26 AC_SUBST([HAVE_WCHAR_H])
28 AC_REQUIRE([gl_FEATURES_H])
30 AC_REQUIRE([gt_TYPE_WINT_T])
31 if test $gt_cv_c_wint_t = yes; then
36 AC_SUBST([HAVE_WINT_T])
38 dnl Check for declarations of anything we want to poison if the
39 dnl corresponding gnulib module is not in use.
40 gl_WARN_ON_USE_PREPARE([[
41 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
43 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
44 included before <wchar.h>. */
45 #if !(defined __GLIBC__ && !defined __UCLIBC__)
52 [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
53 wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset
54 wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
55 wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr
56 wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth
60 dnl Check whether <wchar.h> is usable at all.
61 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
63 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
64 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
65 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
66 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
67 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
68 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
69 [gl_cv_header_wchar_h_correct_inline],
70 [gl_cv_header_wchar_h_correct_inline=yes
72 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
73 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
75 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
76 included before <wchar.h>. */
81 extern int zero (void);
82 int main () { return zero(); }
84 if AC_TRY_EVAL([ac_compile]); then
85 mv conftest.$ac_objext conftest1.$ac_objext
87 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
88 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
90 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
91 included before <wchar.h>. */
96 int zero (void) { return 0; }
98 if AC_TRY_EVAL([ac_compile]); then
99 mv conftest.$ac_objext conftest2.$ac_objext
100 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
103 gl_cv_header_wchar_h_correct_inline=no
107 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
109 if test $gl_cv_header_wchar_h_correct_inline = no; then
110 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
111 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
112 C99 mode. You have four options:
113 - Add the flag -fgnu89-inline to CC and reconfigure, or
114 - Fix your include files, using parts of
115 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
116 - Use a gcc version older than 4.3, or
117 - Don't use the flags -std=c99 or -std=gnu99.
118 Configuration aborted.])
122 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
124 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
125 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
126 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
127 dnl Define it also as a C macro, for the benefit of the unit tests.
128 gl_MODULE_INDICATOR_FOR_TESTS([$1])
131 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
133 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
134 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
135 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
136 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
137 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
138 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
139 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
140 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
141 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
142 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
143 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
144 GNULIB_WMEMCHR=0; AC_SUBST([GNULIB_WMEMCHR])
145 GNULIB_WMEMCMP=0; AC_SUBST([GNULIB_WMEMCMP])
146 GNULIB_WMEMCPY=0; AC_SUBST([GNULIB_WMEMCPY])
147 GNULIB_WMEMMOVE=0; AC_SUBST([GNULIB_WMEMMOVE])
148 GNULIB_WMEMSET=0; AC_SUBST([GNULIB_WMEMSET])
149 GNULIB_WCSLEN=0; AC_SUBST([GNULIB_WCSLEN])
150 GNULIB_WCSNLEN=0; AC_SUBST([GNULIB_WCSNLEN])
151 GNULIB_WCSCPY=0; AC_SUBST([GNULIB_WCSCPY])
152 GNULIB_WCPCPY=0; AC_SUBST([GNULIB_WCPCPY])
153 GNULIB_WCSNCPY=0; AC_SUBST([GNULIB_WCSNCPY])
154 GNULIB_WCPNCPY=0; AC_SUBST([GNULIB_WCPNCPY])
155 GNULIB_WCSCAT=0; AC_SUBST([GNULIB_WCSCAT])
156 GNULIB_WCSNCAT=0; AC_SUBST([GNULIB_WCSNCAT])
157 GNULIB_WCSCMP=0; AC_SUBST([GNULIB_WCSCMP])
158 GNULIB_WCSNCMP=0; AC_SUBST([GNULIB_WCSNCMP])
159 GNULIB_WCSCASECMP=0; AC_SUBST([GNULIB_WCSCASECMP])
160 GNULIB_WCSNCASECMP=0; AC_SUBST([GNULIB_WCSNCASECMP])
161 GNULIB_WCSCOLL=0; AC_SUBST([GNULIB_WCSCOLL])
162 GNULIB_WCSXFRM=0; AC_SUBST([GNULIB_WCSXFRM])
163 GNULIB_WCSDUP=0; AC_SUBST([GNULIB_WCSDUP])
164 GNULIB_WCSCHR=0; AC_SUBST([GNULIB_WCSCHR])
165 GNULIB_WCSRCHR=0; AC_SUBST([GNULIB_WCSRCHR])
166 GNULIB_WCSCSPN=0; AC_SUBST([GNULIB_WCSCSPN])
167 GNULIB_WCSSPN=0; AC_SUBST([GNULIB_WCSSPN])
168 GNULIB_WCSPBRK=0; AC_SUBST([GNULIB_WCSPBRK])
169 GNULIB_WCSSTR=0; AC_SUBST([GNULIB_WCSSTR])
170 GNULIB_WCSTOK=0; AC_SUBST([GNULIB_WCSTOK])
171 GNULIB_WCSWIDTH=0; AC_SUBST([GNULIB_WCSWIDTH])
172 dnl Assume proper GNU behavior unless another module says otherwise.
173 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
174 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
175 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
176 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
177 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
178 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
179 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
180 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
181 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
182 HAVE_WMEMCHR=1; AC_SUBST([HAVE_WMEMCHR])
183 HAVE_WMEMCMP=1; AC_SUBST([HAVE_WMEMCMP])
184 HAVE_WMEMCPY=1; AC_SUBST([HAVE_WMEMCPY])
185 HAVE_WMEMMOVE=1; AC_SUBST([HAVE_WMEMMOVE])
186 HAVE_WMEMSET=1; AC_SUBST([HAVE_WMEMSET])
187 HAVE_WCSLEN=1; AC_SUBST([HAVE_WCSLEN])
188 HAVE_WCSNLEN=1; AC_SUBST([HAVE_WCSNLEN])
189 HAVE_WCSCPY=1; AC_SUBST([HAVE_WCSCPY])
190 HAVE_WCPCPY=1; AC_SUBST([HAVE_WCPCPY])
191 HAVE_WCSNCPY=1; AC_SUBST([HAVE_WCSNCPY])
192 HAVE_WCPNCPY=1; AC_SUBST([HAVE_WCPNCPY])
193 HAVE_WCSCAT=1; AC_SUBST([HAVE_WCSCAT])
194 HAVE_WCSNCAT=1; AC_SUBST([HAVE_WCSNCAT])
195 HAVE_WCSCMP=1; AC_SUBST([HAVE_WCSCMP])
196 HAVE_WCSNCMP=1; AC_SUBST([HAVE_WCSNCMP])
197 HAVE_WCSCASECMP=1; AC_SUBST([HAVE_WCSCASECMP])
198 HAVE_WCSNCASECMP=1; AC_SUBST([HAVE_WCSNCASECMP])
199 HAVE_WCSCOLL=1; AC_SUBST([HAVE_WCSCOLL])
200 HAVE_WCSXFRM=1; AC_SUBST([HAVE_WCSXFRM])
201 HAVE_WCSDUP=1; AC_SUBST([HAVE_WCSDUP])
202 HAVE_WCSCHR=1; AC_SUBST([HAVE_WCSCHR])
203 HAVE_WCSRCHR=1; AC_SUBST([HAVE_WCSRCHR])
204 HAVE_WCSCSPN=1; AC_SUBST([HAVE_WCSCSPN])
205 HAVE_WCSSPN=1; AC_SUBST([HAVE_WCSSPN])
206 HAVE_WCSPBRK=1; AC_SUBST([HAVE_WCSPBRK])
207 HAVE_WCSSTR=1; AC_SUBST([HAVE_WCSSTR])
208 HAVE_WCSTOK=1; AC_SUBST([HAVE_WCSTOK])
209 HAVE_WCSWIDTH=1; AC_SUBST([HAVE_WCSWIDTH])
210 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
211 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
212 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
213 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
214 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
215 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
216 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
217 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
218 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
219 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
220 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
221 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
222 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
223 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])
224 REPLACE_WCSWIDTH=0; AC_SUBST([REPLACE_WCSWIDTH])