1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
3 dnl Copyright (C) 2007-2010 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 36
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 AC_CHECK_HEADERS_ONCE([wchar.h])
21 gl_CHECK_NEXT_HEADERS([wchar.h])
22 if test $ac_cv_header_wchar_h = yes; then
27 AC_SUBST([HAVE_WCHAR_H])
29 AC_REQUIRE([gl_FEATURES_H])
31 AC_REQUIRE([gt_TYPE_WINT_T])
32 if test $gt_cv_c_wint_t = yes; then
37 AC_SUBST([HAVE_WINT_T])
39 dnl Check for declarations of anything we want to poison if the
40 dnl corresponding gnulib module is not in use.
41 gl_WARN_ON_USE_PREPARE([[
42 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
44 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
45 included before <wchar.h>. */
46 #if !(defined __GLIBC__ && !defined __UCLIBC__)
52 ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
53 wcsrtombs wcsnrtombs wcwidth])
56 dnl Check whether <wchar.h> is usable at all.
57 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
59 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
60 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
61 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
62 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
63 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
64 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
65 [gl_cv_header_wchar_h_correct_inline],
66 [gl_cv_header_wchar_h_correct_inline=yes
68 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
69 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
71 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
72 included before <wchar.h>. */
77 extern int zero (void);
78 int main () { return zero(); }
80 if AC_TRY_EVAL([ac_compile]); then
81 mv conftest.$ac_objext conftest1.$ac_objext
83 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
84 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
86 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
87 included before <wchar.h>. */
92 int zero (void) { return 0; }
94 if AC_TRY_EVAL([ac_compile]); then
95 mv conftest.$ac_objext conftest2.$ac_objext
96 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
99 gl_cv_header_wchar_h_correct_inline=no
103 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
105 if test $gl_cv_header_wchar_h_correct_inline = no; then
106 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
107 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
108 C99 mode. You have four options:
109 - Add the flag -fgnu89-inline to CC and reconfigure, or
110 - Fix your include files, using parts of
111 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
112 - Use a gcc version older than 4.3, or
113 - Don't use the flags -std=c99 or -std=gnu99.
114 Configuration aborted.])
118 dnl Unconditionally enables the replacement of <wchar.h>.
119 AC_DEFUN([gl_REPLACE_WCHAR_H],
121 dnl This is a no-op, because <wchar.h> is always overridden.
125 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
127 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
128 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
129 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
130 dnl Define it also as a C macro, for the benefit of the unit tests.
131 gl_MODULE_INDICATOR_FOR_TESTS([$1])
134 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
136 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
137 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
138 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
139 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
140 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
141 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
142 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
143 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
144 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
145 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
146 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
147 dnl Assume proper GNU behavior unless another module says otherwise.
148 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
149 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
150 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
151 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
152 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
153 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
154 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
155 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
156 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
157 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
158 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
159 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
160 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
161 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
162 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
163 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
164 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
165 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
166 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
167 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
168 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
169 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
170 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])