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