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annotate m4/wchar_h.m4 @ 14277:91a2110f419b

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New module 'wmemcmp'. * modules/wmemcmp: New file. * lib/wchar.in.h (wmemcmp): New declaration. * lib/wmemcmp.c: New file. * lib/wmemcmp-impl.h: New file, from libutf8 with modifications. * m4/wmemcmp.m4: New file. * m4/wchar_h.m4 (gl_WCHAR_H): Test whether wmemcmp is declared. (gl_WCHAR_H_DEFAULTS): Initialize GNULIB_WMEMCMP, HAVE_WMEMCMP. * modules/wchar (Makefile.am): Substitute GNULIB_WMEMCMP, HAVE_WMEMCMP. * tests/test-wchar-c++.cc: Test the declaration of wmemcmp. * doc/posix-functions/wmemcmp.texi: Mention the new module.
author Bruno Haible <bruno@clisp.org>
date Sat, 05 Feb 2011 12:47:22 +0100
parents 27d6460ec7c1
children fe5382375992
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
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2
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3 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 dnl Written by Eric Blake.
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9
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10 # wchar_h.m4 serial 38
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11
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12 AC_DEFUN([gl_WCHAR_H],
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13 [
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14 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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15 AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
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16 dnl Prepare for creating substitute <wchar.h>.
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17 dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
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18 dnl character support).
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19 dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
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20 gl_CHECK_NEXT_HEADERS([wchar.h])
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21 if test $ac_cv_header_wchar_h = yes; then
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22 HAVE_WCHAR_H=1
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23 else
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24 HAVE_WCHAR_H=0
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25 fi
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26 AC_SUBST([HAVE_WCHAR_H])
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27
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28 AC_REQUIRE([gl_FEATURES_H])
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30 AC_REQUIRE([gt_TYPE_WINT_T])
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31 if test $gt_cv_c_wint_t = yes; then
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32 HAVE_WINT_T=1
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33 else
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34 HAVE_WINT_T=0
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35 fi
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36 AC_SUBST([HAVE_WINT_T])
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37
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38 dnl Check for declarations of anything we want to poison if the
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39 dnl corresponding gnulib module is not in use.
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40 gl_WARN_ON_USE_PREPARE([[
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41 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
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42 <wchar.h>.
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43 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
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44 included before <wchar.h>. */
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45 #if !(defined __GLIBC__ && !defined __UCLIBC__)
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46 # include <stddef.h>
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47 # include <stdio.h>
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48 # include <time.h>
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49 #endif
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50 #include <wchar.h>
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51 ]],
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52 [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
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53 wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp
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54 ])
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55 ])
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56
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57 dnl Check whether <wchar.h> is usable at all.
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58 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
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59 [
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60 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
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61 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
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62 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
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63 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
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64 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
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65 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
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66 [gl_cv_header_wchar_h_correct_inline],
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67 [gl_cv_header_wchar_h_correct_inline=yes
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68 AC_LANG_CONFTEST([
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69 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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70 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
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71 <wchar.h>.
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72 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
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73 included before <wchar.h>. */
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74 #include <stddef.h>
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75 #include <stdio.h>
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76 #include <time.h>
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77 #include <wchar.h>
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78 extern int zero (void);
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79 int main () { return zero(); }
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80 ]])])
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81 if AC_TRY_EVAL([ac_compile]); then
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82 mv conftest.$ac_objext conftest1.$ac_objext
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83 AC_LANG_CONFTEST([
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84 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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86 <wchar.h>.
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87 BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
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88 included before <wchar.h>. */
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89 #include <stddef.h>
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90 #include <stdio.h>
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91 #include <time.h>
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92 #include <wchar.h>
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93 int zero (void) { return 0; }
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94 ]])])
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95 if AC_TRY_EVAL([ac_compile]); then
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96 mv conftest.$ac_objext conftest2.$ac_objext
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97 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
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98 :
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99 else
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100 gl_cv_header_wchar_h_correct_inline=no
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101 fi
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102 fi
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103 fi
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104 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
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105 ])
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106 if test $gl_cv_header_wchar_h_correct_inline = no; then
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107 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
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108 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
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109 C99 mode. You have four options:
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110 - Add the flag -fgnu89-inline to CC and reconfigure, or
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111 - Fix your include files, using parts of
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112 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
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113 - Use a gcc version older than 4.3, or
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114 - Don't use the flags -std=c99 or -std=gnu99.
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115 Configuration aborted.])
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116 fi
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117 ])
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118
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119 dnl Unconditionally enables the replacement of <wchar.h>.
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120 AC_DEFUN([gl_REPLACE_WCHAR_H],
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121 [
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122 dnl This is a no-op, because <wchar.h> is always overridden.
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123 :
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124 ])
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125
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126 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
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127 [
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128 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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129 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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130 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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61705dab4021 Tests of module 'wchar' in C++ mode.
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131 dnl Define it also as a C macro, for the benefit of the unit tests.
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132 gl_MODULE_INDICATOR_FOR_TESTS([$1])
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133 ])
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134
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135 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
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136 [
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137 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
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138 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
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139 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
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140 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
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141 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
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142 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
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143 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
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144 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
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145 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
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146 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
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147 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
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148 GNULIB_WMEMCHR=0; AC_SUBST([GNULIB_WMEMCHR])
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149 GNULIB_WMEMCMP=0; AC_SUBST([GNULIB_WMEMCMP])
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150 dnl Assume proper GNU behavior unless another module says otherwise.
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151 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
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152 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
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153 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
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154 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
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155 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
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156 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
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157 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
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158 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
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159 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
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160 HAVE_WMEMCHR=1; AC_SUBST([HAVE_WMEMCHR])
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161 HAVE_WMEMCMP=1; AC_SUBST([HAVE_WMEMCMP])
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162 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
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163 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
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164 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
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165 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
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166 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
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167 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
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168 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
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169 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
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170 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
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171 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
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172 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
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173 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
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174 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
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175 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])
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176 ])