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