1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
3 dnl Copyright (C) 2007-2009 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.
12 AC_DEFUN([gl_WCHAR_H],
14 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
15 AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
16 AC_CACHE_CHECK([whether <wchar.h> is standalone],
17 [gl_cv_header_wchar_h_standalone],
18 [AC_COMPILE_IFELSE([[#include <wchar.h>
20 [gl_cv_header_wchar_h_standalone=yes],
21 [gl_cv_header_wchar_h_standalone=no])])
23 AC_REQUIRE([gt_TYPE_WINT_T])
24 if test $gt_cv_c_wint_t = yes; then
29 AC_SUBST([HAVE_WINT_T])
31 dnl If <stddef.h> is replaced, then <wchar.h> must also be replaced.
32 AC_REQUIRE([gl_STDDEF_H])
34 dnl Prepare for creating substitute <wchar.h>.
35 dnl Do it always: WCHAR_H may be empty here but can be set later.
36 dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
37 dnl character support).
38 AC_CHECK_HEADERS_ONCE([wchar.h])
39 if test $ac_cv_header_wchar_h = yes; then
44 AC_SUBST([HAVE_WCHAR_H])
45 dnl Execute this unconditionally, because WCHAR_H may be set by other
46 dnl modules, after this code is executed.
47 gl_CHECK_NEXT_HEADERS([wchar.h])
50 dnl Check whether <wchar.h> is usable at all.
51 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
53 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
54 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
55 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
56 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
57 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
58 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
59 [gl_cv_header_wchar_h_correct_inline],
60 [gl_cv_header_wchar_h_correct_inline=yes
62 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
64 extern int zero (void);
65 int main () { return zero(); }
67 if AC_TRY_EVAL([ac_compile]); then
68 mv conftest.$ac_objext conftest1.$ac_objext
70 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
72 int zero (void) { return 0; }
74 if AC_TRY_EVAL([ac_compile]); then
75 mv conftest.$ac_objext conftest2.$ac_objext
76 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
79 gl_cv_header_wchar_h_correct_inline=no
83 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
85 if test $gl_cv_header_wchar_h_correct_inline = no; then
86 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
87 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
88 C99 mode. You have four options:
89 - Add the flag -fgnu89-inline to CC and reconfigure, or
90 - Fix your include files, using parts of
91 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
92 - Use a gcc version older than 4.3, or
93 - Don't use the flags -std=c99 or -std=gnu99.
94 Configuration aborted.])
98 dnl Unconditionally enables the replacement of <wchar.h>.
99 AC_DEFUN([gl_REPLACE_WCHAR_H],
101 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
105 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
107 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
108 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
109 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
112 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
114 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
115 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
116 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
117 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
118 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
119 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
120 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
121 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
122 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
123 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
124 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
125 dnl Assume proper GNU behavior unless another module says otherwise.
126 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
127 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
128 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
129 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
130 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
131 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
132 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
133 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
134 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
135 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
136 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
137 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
138 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
139 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
140 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
141 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
142 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
143 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
144 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
145 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
146 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
147 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
148 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])