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annotate m4/wchar_h.m4 @ 13066:fc8c984b0733

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Factorize common .m4 code.
author Bruno Haible <bruno@clisp.org>
date Sat, 27 Mar 2010 18:38:53 +0100
parents 61705dab4021
children b2385e7b332e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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12913
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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) 2007-2010 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 33
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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 AC_CHECK_HEADERS_ONCE([wchar.h])
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21 gl_CHECK_NEXT_HEADERS([wchar.h])
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22 if test $ac_cv_header_wchar_h = yes; then
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23 HAVE_WCHAR_H=1
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24 else
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25 HAVE_WCHAR_H=0
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26 fi
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27 AC_SUBST([HAVE_WCHAR_H])
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28
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29 AC_REQUIRE([gt_TYPE_WINT_T])
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30 if test $gt_cv_c_wint_t = yes; then
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31 HAVE_WINT_T=1
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32 else
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33 HAVE_WINT_T=0
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34 fi
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35 AC_SUBST([HAVE_WINT_T])
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36
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37 dnl Check for declarations of anything we want to poison if the
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38 dnl corresponding gnulib module is not in use.
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39 gl_WARN_ON_USE_PREPARE([[
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40 /* Some systems require additional headers. */
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41 #ifndef __GLIBC__
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42 # include <stddef.h>
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43 # include <stdio.h>
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44 # include <time.h>
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45 #endif
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46 #include <wchar.h>
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47 ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
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48 wcsrtombs wcsnrtombs wcwidth])
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49 ])
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50
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51 dnl Check whether <wchar.h> is usable at all.
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52 AC_DEFUN([gl_WCHAR_H_INLINE_OK],
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53 [
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54 dnl Test whether <wchar.h> suffers due to the transition from '__inline' to
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55 dnl 'gnu_inline'. See <http://sourceware.org/bugzilla/show_bug.cgi?id=4022>
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56 dnl and <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>. In summary,
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57 dnl glibc version 2.5 or older, together with gcc version 4.3 or newer and
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58 dnl the option -std=c99 or -std=gnu99, leads to a broken <wchar.h>.
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59 AC_CACHE_CHECK([whether <wchar.h> uses 'inline' correctly],
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60 [gl_cv_header_wchar_h_correct_inline],
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61 [gl_cv_header_wchar_h_correct_inline=yes
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62 AC_LANG_CONFTEST([
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63 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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64 #include <wchar.h>
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65 extern int zero (void);
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66 int main () { return zero(); }
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67 ]])])
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68 if AC_TRY_EVAL([ac_compile]); then
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69 mv conftest.$ac_objext conftest1.$ac_objext
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70 AC_LANG_CONFTEST([
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71 AC_LANG_SOURCE([[#define wcstod renamed_wcstod
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72 #include <wchar.h>
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73 int zero (void) { return 0; }
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74 ]])])
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75 if AC_TRY_EVAL([ac_compile]); then
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76 mv conftest.$ac_objext conftest2.$ac_objext
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77 if $CC -o conftest$ac_exeext $CFLAGS $LDFLAGS conftest1.$ac_objext conftest2.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD 2>&1; then
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78 :
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79 else
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80 gl_cv_header_wchar_h_correct_inline=no
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81 fi
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82 fi
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83 fi
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84 rm -f conftest1.$ac_objext conftest2.$ac_objext conftest$ac_exeext
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85 ])
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86 if test $gl_cv_header_wchar_h_correct_inline = no; then
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87 AC_MSG_ERROR([<wchar.h> cannot be used with this compiler ($CC $CFLAGS $CPPFLAGS).
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88 This is a known interoperability problem of glibc <= 2.5 with gcc >= 4.3 in
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89 C99 mode. You have four options:
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90 - Add the flag -fgnu89-inline to CC and reconfigure, or
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91 - Fix your include files, using parts of
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92 <http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=b037a293a48718af30d706c2e18c929d0e69a621>, or
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93 - Use a gcc version older than 4.3, or
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94 - Don't use the flags -std=c99 or -std=gnu99.
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95 Configuration aborted.])
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96 fi
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97 ])
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98
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99 dnl Unconditionally enables the replacement of <wchar.h>.
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100 AC_DEFUN([gl_REPLACE_WCHAR_H],
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101 [
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102 dnl This is a no-op, because <wchar.h> is always overridden.
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103 :
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104 ])
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105
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106 AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
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107 [
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108 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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109 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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110 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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111 dnl Define it also as a C macro, for the benefit of the unit tests.
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112 gl_MODULE_INDICATOR([$1])
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113 ])
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114
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115 AC_DEFUN([gl_WCHAR_H_DEFAULTS],
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116 [
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117 GNULIB_BTOWC=0; AC_SUBST([GNULIB_BTOWC])
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118 GNULIB_WCTOB=0; AC_SUBST([GNULIB_WCTOB])
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119 GNULIB_MBSINIT=0; AC_SUBST([GNULIB_MBSINIT])
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120 GNULIB_MBRTOWC=0; AC_SUBST([GNULIB_MBRTOWC])
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121 GNULIB_MBRLEN=0; AC_SUBST([GNULIB_MBRLEN])
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122 GNULIB_MBSRTOWCS=0; AC_SUBST([GNULIB_MBSRTOWCS])
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123 GNULIB_MBSNRTOWCS=0; AC_SUBST([GNULIB_MBSNRTOWCS])
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124 GNULIB_WCRTOMB=0; AC_SUBST([GNULIB_WCRTOMB])
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125 GNULIB_WCSRTOMBS=0; AC_SUBST([GNULIB_WCSRTOMBS])
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126 GNULIB_WCSNRTOMBS=0; AC_SUBST([GNULIB_WCSNRTOMBS])
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127 GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
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128 dnl Assume proper GNU behavior unless another module says otherwise.
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129 HAVE_BTOWC=1; AC_SUBST([HAVE_BTOWC])
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130 HAVE_MBSINIT=1; AC_SUBST([HAVE_MBSINIT])
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131 HAVE_MBRTOWC=1; AC_SUBST([HAVE_MBRTOWC])
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diff changeset
132 HAVE_MBRLEN=1; AC_SUBST([HAVE_MBRLEN])
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parents:
diff changeset
133 HAVE_MBSRTOWCS=1; AC_SUBST([HAVE_MBSRTOWCS])
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parents:
diff changeset
134 HAVE_MBSNRTOWCS=1; AC_SUBST([HAVE_MBSNRTOWCS])
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parents:
diff changeset
135 HAVE_WCRTOMB=1; AC_SUBST([HAVE_WCRTOMB])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
136 HAVE_WCSRTOMBS=1; AC_SUBST([HAVE_WCSRTOMBS])
6a1b2eb4c331 More consistent naming of *.m4 files.
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parents:
diff changeset
137 HAVE_WCSNRTOMBS=1; AC_SUBST([HAVE_WCSNRTOMBS])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
138 HAVE_DECL_WCTOB=1; AC_SUBST([HAVE_DECL_WCTOB])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
139 HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
140 REPLACE_MBSTATE_T=0; AC_SUBST([REPLACE_MBSTATE_T])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
141 REPLACE_BTOWC=0; AC_SUBST([REPLACE_BTOWC])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
142 REPLACE_WCTOB=0; AC_SUBST([REPLACE_WCTOB])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
143 REPLACE_MBSINIT=0; AC_SUBST([REPLACE_MBSINIT])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
144 REPLACE_MBRTOWC=0; AC_SUBST([REPLACE_MBRTOWC])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
145 REPLACE_MBRLEN=0; AC_SUBST([REPLACE_MBRLEN])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
146 REPLACE_MBSRTOWCS=0; AC_SUBST([REPLACE_MBSRTOWCS])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
147 REPLACE_MBSNRTOWCS=0; AC_SUBST([REPLACE_MBSNRTOWCS])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
148 REPLACE_WCRTOMB=0; AC_SUBST([REPLACE_WCRTOMB])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
149 REPLACE_WCSRTOMBS=0; AC_SUBST([REPLACE_WCSRTOMBS])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
150 REPLACE_WCSNRTOMBS=0; AC_SUBST([REPLACE_WCSNRTOMBS])
6a1b2eb4c331 More consistent naming of *.m4 files.
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parents:
diff changeset
151 REPLACE_WCWIDTH=0; AC_SUBST([REPLACE_WCWIDTH])
6a1b2eb4c331 More consistent naming of *.m4 files.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
152 ])