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f434ba03 PA |
1 | dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues. |
2 | ||
db026a31 | 3 | dnl Copyright (C) 2007-2010 Free Software Foundation, Inc. |
f434ba03 PA |
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. | |
7 | ||
8 | dnl Written by Eric Blake. | |
9 | ||
10 | # wchar_h.m4 serial 33 | |
11 | ||
12 | AC_DEFUN([gl_WCHAR_H], | |
13 | [ | |
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 | |
23 | HAVE_WCHAR_H=1 | |
24 | else | |
25 | HAVE_WCHAR_H=0 | |
26 | fi | |
27 | AC_SUBST([HAVE_WCHAR_H]) | |
28 | ||
29 | AC_REQUIRE([gt_TYPE_WINT_T]) | |
30 | if test $gt_cv_c_wint_t = yes; then | |
31 | HAVE_WINT_T=1 | |
32 | else | |
33 | HAVE_WINT_T=0 | |
34 | fi | |
35 | AC_SUBST([HAVE_WINT_T]) | |
36 | ||
37 | dnl Check for declarations of anything we want to poison if the | |
38 | dnl corresponding gnulib module is not in use. | |
39 | gl_WARN_ON_USE_PREPARE([[ | |
40 | /* Some systems require additional headers. */ | |
41 | #ifndef __GLIBC__ | |
42 | # include <stddef.h> | |
43 | # include <stdio.h> | |
44 | # include <time.h> | |
45 | #endif | |
46 | #include <wchar.h> | |
47 | ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb | |
48 | wcsrtombs wcsnrtombs wcwidth]) | |
49 | ]) | |
50 | ||
51 | dnl Check whether <wchar.h> is usable at all. | |
52 | AC_DEFUN([gl_WCHAR_H_INLINE_OK], | |
53 | [ | |
54 | dnl Test whether <wchar.h> suffers due to the transition from '__inline' to | |
55 | dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022> | |
56 | dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary, | |
57 | dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and | |
58 | dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>. | |
59 | AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly], | |
60 | [gl_cv_header_wchar_h_correct_inline], | |
61 | [gl_cv_header_wchar_h_correct_inline=yes | |
62 | AC_LANG_CONFTEST([ | |
63 | AC_LANG_SOURCE([[#define wcstod renamed_wcstod | |
64 | #include <wchar.h> | |
65 | extern int zero (void); | |
66 | int main () { return zero(); } | |
67 | ]])]) | |
68 | if AC_TRY_EVAL([ac_compile]); then | |
69 | mv conftest.$ac_objext conftest1.$ac_objext | |
70 | AC_LANG_CONFTEST([ | |
71 | AC_LANG_SOURCE([[#define wcstod renamed_wcstod | |
72 | #include <wchar.h> | |
73 | int zero (void) { return 0; } | |
74 | ]])]) | |
75 | if AC_TRY_EVAL([ac_compile]); then | |
76 | mv conftest.$ac_objext conftest2.$ac_objext | |
77 | if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then | |
78 | : | |
79 | else | |
80 | gl_cv_header_wchar_h_correct_inline=no | |
81 | fi | |
82 | fi | |
83 | fi | |
84 | rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext | |
85 | ]) | |
86 | if test $gl_cv_header_wchar_h_correct_inline = no; then | |
87 | AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS). | |
88 | This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in | |
89 | C99 mode. You have four options: | |
90 | - Add the flag -fgnu89-inline to CC and reconfigure, or | |
91 | - Fix your include files, using parts of | |
92 | <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or | |
93 | - Use a gcc version older than 4.3, or | |
94 | - Don't use the flags -std=c99 or -std=gnu99. | |
95 | Configuration aborted.]) | |
96 | fi | |
97 | ]) | |
98 | ||
99 | dnl Unconditionally enables the replacement of <wchar.h>. | |
100 | AC_DEFUN([gl_REPLACE_WCHAR_H], | |
101 | [ | |
102 | dnl This is a no-op, because <wchar.h> is always overridden. | |
103 | : | |
104 | ]) | |
105 | ||
106 | AC_DEFUN([gl_WCHAR_MODULE_INDICATOR], | |
107 | [ | |
108 | dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | |
109 | AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) | |
110 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) | |
111 | dnl Define it also as a C macro, for the benefit of the unit tests. | |
112 | gl_MODULE_INDICATOR_FOR_TESTS([$1]) | |
113 | ]) | |
114 | ||
115 | AC_DEFUN([gl_WCHAR_H_DEFAULTS], | |
116 | [ | |
117 | GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC]) | |
118 | GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB]) | |
119 | GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT]) | |
120 | GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC]) | |
121 | GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN]) | |
122 | GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS]) | |
123 | GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS]) | |
124 | GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB]) | |
125 | GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS]) | |
126 | GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS]) | |
127 | GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH]) | |
128 | dnl Assume proper GNU behavior unless another module says otherwise. | |
129 | HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC]) | |
130 | HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT]) | |
131 | HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC]) | |
132 | HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN]) | |
133 | HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS]) | |
134 | HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS]) | |
135 | HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB]) | |
136 | HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS]) | |
137 | HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS]) | |
138 | HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB]) | |
139 | HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH]) | |
140 | REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T]) | |
141 | REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC]) | |
142 | REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB]) | |
143 | REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT]) | |
144 | REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC]) | |
145 | REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN]) | |
146 | REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS]) | |
147 | REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS]) | |
148 | REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB]) | |
149 | REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS]) | |
150 | REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS]) | |
151 | REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH]) | |
152 | ]) |