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.
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
24 AC_CACHE_CHECK([whether <wchar.h> is standalone],
25 [gl_cv_header_wchar_h_standalone],
26 [AC_COMPILE_IFELSE([[#include <wchar.h>
28 [gl_cv_header_wchar_h_standalone=yes],
29 [gl_cv_header_wchar_h_standalone=no])])
33 AC_SUBST([HAVE_WCHAR_H])
35 AC_REQUIRE([gt_TYPE_WINT_T])
36 if test $gt_cv_c_wint_t = yes; then
41 AC_SUBST([HAVE_WINT_T])
44 dnl Check whether <wchar.h> is usable at all.
45 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
47 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
48 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
49 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
50 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
51 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
52 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
53 [gl_cv_header_wchar_h_correct_inline],
54 [gl_cv_header_wchar_h_correct_inline=yes
56 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
58 extern int zero (void);
59 int main () { return zero(); }
61 if AC_TRY_EVAL([ac_compile]); then
62 mv conftest.$ac_objext conftest1.$ac_objext
64 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
66 int zero (void) { return 0; }
68 if AC_TRY_EVAL([ac_compile]); then
69 mv conftest.$ac_objext conftest2.$ac_objext
70 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
73 gl_cv_header_wchar_h_correct_inline=no
77 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
79 if test $gl_cv_header_wchar_h_correct_inline = no; then
80 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
81 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
82 C99 mode. You have four options:
83 - Add the flag -fgnu89-inline to CC and reconfigure, or
84 - Fix your include files, using parts of
85 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
86 - Use a gcc version older than 4.3, or
87 - Don't use the flags -std=c99 or -std=gnu99.
88 Configuration aborted.])
92 dnl Unconditionally enables the replacement of <wchar.h>.
93 AC_DEFUN([gl_REPLACE_WCHAR_H],
95 dnl This is a no-op, because <wchar.h> is always overridden.
99 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
101 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
102 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
103 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
106 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
108 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
109 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
110 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
111 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
112 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
113 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
114 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
115 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
116 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
117 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
118 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
119 dnl Assume proper GNU behavior unless another module says otherwise.
120 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
121 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
122 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
123 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
124 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
125 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
126 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
127 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
128 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
129 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
130 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
131 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
132 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
133 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
134 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
135 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
136 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
137 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
138 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
139 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
140 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
141 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
142 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])