1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
3 dnl Copyright (C) 2007-2011 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 38
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 $gt_cv_c_wint_t = yes; then
36 AC_SUBST([HAVE_WINT_T])
38 dnl Check for declarations of anything we want to poison if the
39 dnl corresponding gnulib module is not in use.
40 gl_WARN_ON_USE_PREPARE([[
41 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
43 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
44 included before <wchar.h>. */
45 #if !(defined __GLIBC__ && !defined __UCLIBC__)
52 [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
53 wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset
54 wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
59 dnl Check whether <wchar.h> is usable at all.
60 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
62 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
63 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
64 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
65 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
66 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
67 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
68 [gl_cv_header_wchar_h_correct_inline],
69 [gl_cv_header_wchar_h_correct_inline=yes
71 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
72 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
74 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
75 included before <wchar.h>. */
80 extern int zero (void);
81 int main () { return zero(); }
83 if AC_TRY_EVAL([ac_compile]); then
84 mv conftest.$ac_objext conftest1.$ac_objext
86 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
87 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
89 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
90 included before <wchar.h>. */
95 int zero (void) { return 0; }
97 if AC_TRY_EVAL([ac_compile]); then
98 mv conftest.$ac_objext conftest2.$ac_objext
99 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
102 gl_cv_header_wchar_h_correct_inline=no
106 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
108 if test $gl_cv_header_wchar_h_correct_inline = no; then
109 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
110 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
111 C99 mode. You have four options:
112 - Add the flag -fgnu89-inline to CC and reconfigure, or
113 - Fix your include files, using parts of
114 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
115 - Use a gcc version older than 4.3, or
116 - Don't use the flags -std=c99 or -std=gnu99.
117 Configuration aborted.])
121 dnl Unconditionally enables the replacement of <wchar.h>.
122 AC_DEFUN([gl_REPLACE_WCHAR_H],
124 dnl This is a no-op, because <wchar.h> is always overridden.
128 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
130 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
131 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
132 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
133 dnl Define it also as a C macro, for the benefit of the unit tests.
134 gl_MODULE_INDICATOR_FOR_TESTS([$1])
137 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
139 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
140 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
141 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
142 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
143 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
144 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
145 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
146 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
147 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
148 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
149 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
150 GNULIB_WMEMCHR=0; AC_SUBST([GNULIB_WMEMCHR])
151 GNULIB_WMEMCMP=0; AC_SUBST([GNULIB_WMEMCMP])
152 GNULIB_WMEMCPY=0; AC_SUBST([GNULIB_WMEMCPY])
153 GNULIB_WMEMMOVE=0; AC_SUBST([GNULIB_WMEMMOVE])
154 GNULIB_WMEMSET=0; AC_SUBST([GNULIB_WMEMSET])
155 GNULIB_WCSLEN=0; AC_SUBST([GNULIB_WCSLEN])
156 GNULIB_WCSNLEN=0; AC_SUBST([GNULIB_WCSNLEN])
157 GNULIB_WCSCPY=0; AC_SUBST([GNULIB_WCSCPY])
158 GNULIB_WCPCPY=0; AC_SUBST([GNULIB_WCPCPY])
159 GNULIB_WCSNCPY=0; AC_SUBST([GNULIB_WCSNCPY])
160 GNULIB_WCPNCPY=0; AC_SUBST([GNULIB_WCPNCPY])
161 GNULIB_WCSCAT=0; AC_SUBST([GNULIB_WCSCAT])
162 GNULIB_WCSNCAT=0; AC_SUBST([GNULIB_WCSNCAT])
163 GNULIB_WCSCMP=0; AC_SUBST([GNULIB_WCSCMP])
164 GNULIB_WCSNCMP=0; AC_SUBST([GNULIB_WCSNCMP])
165 dnl Assume proper GNU behavior unless another module says otherwise.
166 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
167 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
168 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
169 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
170 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
171 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
172 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
173 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
174 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
175 HAVE_WMEMCHR=1; AC_SUBST([HAVE_WMEMCHR])
176 HAVE_WMEMCMP=1; AC_SUBST([HAVE_WMEMCMP])
177 HAVE_WMEMCPY=1; AC_SUBST([HAVE_WMEMCPY])
178 HAVE_WMEMMOVE=1; AC_SUBST([HAVE_WMEMMOVE])
179 HAVE_WMEMSET=1; AC_SUBST([HAVE_WMEMSET])
180 HAVE_WCSLEN=1; AC_SUBST([HAVE_WCSLEN])
181 HAVE_WCSNLEN=1; AC_SUBST([HAVE_WCSNLEN])
182 HAVE_WCSCPY=1; AC_SUBST([HAVE_WCSCPY])
183 HAVE_WCPCPY=1; AC_SUBST([HAVE_WCPCPY])
184 HAVE_WCSNCPY=1; AC_SUBST([HAVE_WCSNCPY])
185 HAVE_WCPNCPY=1; AC_SUBST([HAVE_WCPNCPY])
186 HAVE_WCSCAT=1; AC_SUBST([HAVE_WCSCAT])
187 HAVE_WCSNCAT=1; AC_SUBST([HAVE_WCSNCAT])
188 HAVE_WCSCMP=1; AC_SUBST([HAVE_WCSCMP])
189 HAVE_WCSNCMP=1; AC_SUBST([HAVE_WCSNCMP])
190 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
191 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
192 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
193 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
194 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
195 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
196 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
197 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
198 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
199 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
200 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
201 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
202 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
203 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])