aboutsummaryrefslogtreecommitdiff
path: root/gdb/gnulib/m4/wchar_h.m4
blob: 8cae82dd0b92a8baf0ca095efe5eb41d3d82ac35 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.

dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Written by Eric Blake.

# wchar_h.m4 serial 33

AC_DEFUN([gl_WCHAR_H],
[
  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
  AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
  dnl Prepare for creating substitute <wchar.h>.
  dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
  dnl character support).
  dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
  AC_CHECK_HEADERS_ONCE([wchar.h])
  gl_CHECK_NEXT_HEADERS([wchar.h])
  if test $ac_cv_header_wchar_h = yes; then
    HAVE_WCHAR_H=1
  else
    HAVE_WCHAR_H=0
  fi
  AC_SUBST([HAVE_WCHAR_H])

  AC_REQUIRE([gt_TYPE_WINT_T])
  if test $gt_cv_c_wint_t = yes; then
    HAVE_WINT_T=1
  else
    HAVE_WINT_T=0
  fi
  AC_SUBST([HAVE_WINT_T])

  dnl Check for declarations of anything we want to poison if the
  dnl corresponding gnulib module is not in use.
  gl_WARN_ON_USE_PREPARE([[
/* Some systems require additional headers.  */
#ifndef __GLIBC__
# include <stddef.h>
# include <stdio.h>
# include <time.h>
#endif
#include <wchar.h>
    ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
    wcsrtombs wcsnrtombs wcwidth])
])

dnl Check whether <wchar.h> is usable at all.
AC_DEFUN([gl_WCHAR_H_INLINE_OK],
[
  dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
  dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
  dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
  dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
  dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
  AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
    [gl_cv_header_wchar_h_correct_inline],
    [gl_cv_header_wchar_h_correct_inline=yes
     AC_LANG_CONFTEST([
       AC_LANG_SOURCE([[#define wcstod renamed_wcstod
#include <wchar.h>
extern int zero (void);
int main () { return zero(); }
]])])
     if AC_TRY_EVAL([ac_compile]); then
       mv conftest.$ac_objext conftest1.$ac_objext
       AC_LANG_CONFTEST([
         AC_LANG_SOURCE([[#define wcstod renamed_wcstod
#include <wchar.h>
int zero (void) { return 0; }
]])])
       if AC_TRY_EVAL([ac_compile]); then
         mv conftest.$ac_objext conftest2.$ac_objext
         if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
           :
         else
           gl_cv_header_wchar_h_correct_inline=no
         fi
       fi
     fi
     rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
    ])
  if test $gl_cv_header_wchar_h_correct_inline = no; then
    AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
C99 mode. You have four options:
  - Add the flag -fgnu89-inline to CC and reconfigure, or
  - Fix your include files, using parts of
    <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
  - Use a gcc version older than 4.3, or
  - Don't use the flags -std=c99 or -std=gnu99.
Configuration aborted.])
  fi
])

dnl Unconditionally enables the replacement of <wchar.h>.
AC_DEFUN([gl_REPLACE_WCHAR_H],
[
  dnl This is a no-op, because <wchar.h> is always overridden.
  :
])

AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
  dnl Define it also as a C macro, for the benefit of the unit tests.
  gl_MODULE_INDICATOR_FOR_TESTS([$1])
])

AC_DEFUN([gl_WCHAR_H_DEFAULTS],
[
  GNULIB_BTOWC=0;      AC_SUBST([GNULIB_BTOWC])
  GNULIB_WCTOB=0;      AC_SUBST([GNULIB_WCTOB])
  GNULIB_MBSINIT=0;    AC_SUBST([GNULIB_MBSINIT])
  GNULIB_MBRTOWC=0;    AC_SUBST([GNULIB_MBRTOWC])
  GNULIB_MBRLEN=0;     AC_SUBST([GNULIB_MBRLEN])
  GNULIB_MBSRTOWCS=0;  AC_SUBST([GNULIB_MBSRTOWCS])
  GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
  GNULIB_WCRTOMB=0;    AC_SUBST([GNULIB_WCRTOMB])
  GNULIB_WCSRTOMBS=0;  AC_SUBST([GNULIB_WCSRTOMBS])
  GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
  GNULIB_WCWIDTH=0;    AC_SUBST([GNULIB_WCWIDTH])
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
  HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
  HAVE_MBRTOWC=1;       AC_SUBST([HAVE_MBRTOWC])
  HAVE_MBRLEN=1;        AC_SUBST([HAVE_MBRLEN])
  HAVE_MBSRTOWCS=1;     AC_SUBST([HAVE_MBSRTOWCS])
  HAVE_MBSNRTOWCS=1;    AC_SUBST([HAVE_MBSNRTOWCS])
  HAVE_WCRTOMB=1;       AC_SUBST([HAVE_WCRTOMB])
  HAVE_WCSRTOMBS=1;     AC_SUBST([HAVE_WCSRTOMBS])
  HAVE_WCSNRTOMBS=1;    AC_SUBST([HAVE_WCSNRTOMBS])
  HAVE_DECL_WCTOB=1;    AC_SUBST([HAVE_DECL_WCTOB])
  HAVE_DECL_WCWIDTH=1;  AC_SUBST([HAVE_DECL_WCWIDTH])
  REPLACE_MBSTATE_T=0;  AC_SUBST([REPLACE_MBSTATE_T])
  REPLACE_BTOWC=0;      AC_SUBST([REPLACE_BTOWC])
  REPLACE_WCTOB=0;      AC_SUBST([REPLACE_WCTOB])
  REPLACE_MBSINIT=0;    AC_SUBST([REPLACE_MBSINIT])
  REPLACE_MBRTOWC=0;    AC_SUBST([REPLACE_MBRTOWC])
  REPLACE_MBRLEN=0;     AC_SUBST([REPLACE_MBRLEN])
  REPLACE_MBSRTOWCS=0;  AC_SUBST([REPLACE_MBSRTOWCS])
  REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
  REPLACE_WCRTOMB=0;    AC_SUBST([REPLACE_WCRTOMB])
  REPLACE_WCSRTOMBS=0;  AC_SUBST([REPLACE_WCSRTOMBS])
  REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
  REPLACE_WCWIDTH=0;    AC_SUBST([REPLACE_WCWIDTH])
])