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pandora-build v0.100 - Fixes several bugs found by cb1kenobi. Add several thoughts from folks at LCA.

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Lines of Context:
m4/readline.m4
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AC_DEFUN([DRIZZLE_CHECK_READLINE_DECLARES_HIST_ENTRY], [
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    AC_CACHE_CHECK([HIST_ENTRY is declared in readline/readline.h], mysql_cv_hist_entry_declared,
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        AC_TRY_COMPILE(
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            [
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                #include "stdio.h"
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                #include "readline/readline.h"
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            ],
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            [ 
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                HIST_ENTRY entry;
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            ],
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            [
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                mysql_cv_hist_entry_declared=yes
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                AC_DEFINE_UNQUOTED(HAVE_HIST_ENTRY, [1],
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                                   [HIST_ENTRY is defined in the outer libeditreadline])
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            ],
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            [mysql_cv_libedit_interface=no]
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        )
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    )
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])
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AC_DEFUN([DRIZZLE_CHECK_NEW_RL_INTERFACE], [
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    AC_CACHE_CHECK([defined rl_compentry_func_t and rl_completion_func_t], mysql_cv_new_rl_interface,
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        AC_TRY_COMPILE(
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            [
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                #include "stdio.h"
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                #include "readline/readline.h"
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            ],
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            [ 
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                rl_completion_func_t *func1= (rl_completion_func_t*)0;
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                rl_compentry_func_t *func2= (rl_compentry_func_t*)0;
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            ],
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            [
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                mysql_cv_new_rl_interface=yes
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                AC_DEFINE_UNQUOTED([USE_NEW_READLINE_INTERFACE], [1],
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                                   [used new readline interface (are rl_completion_func_t and rl_compentry_func_t defined)])
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            ],
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            [mysql_cv_new_rl_interface=no]
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        )
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    )
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])
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dnl
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dnl check for availability of multibyte characters and functions
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dnl (Based on BASH_CHECK_MULTIBYTE in aclocal.m4 of readline-5.0)
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dnl
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AC_DEFUN([DRIZZLE_CHECK_MULTIBYTE],
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[
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AC_CHECK_HEADERS(wctype.h)
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AC_CHECK_HEADERS(wchar.h)
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AC_CHECK_HEADERS(langinfo.h)
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AC_CHECK_FUNC(mbsrtowcs, AC_DEFINE([HAVE_MBSRTOWCS],[],[Define if you have mbsrtowcs]))
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AC_CHECK_FUNC(mbrtowc, AC_DEFINE([HAVE_MBRTOWC],[],[Define if you have mbrtowc]))
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AC_CHECK_FUNC(mbrlen, AC_DEFINE([HAVE_MBRLEN],[],[Define if you have mbrlen]))
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AC_CHECK_FUNC(wctomb, AC_DEFINE([HAVE_WCTOMB],[],[Define if you have wctomb]))
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AC_CHECK_FUNC(wcwidth, AC_DEFINE([HAVE_WCWIDTH],[],[Define if you have wcwidth]))
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AC_CHECK_FUNC(wcsdup, AC_DEFINE([HAVE_WCSDUP],[],[Define if you check wcsdup]))
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AC_CACHE_CHECK([for mbstate_t], mysql_cv_have_mbstate_t,
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[AC_TRY_COMPILE([
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#include <wchar.h>], [
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  mbstate_t ps;
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  mbstate_t *psp;
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  psp = (mbstate_t *)0;
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], mysql_cv_have_mbstate_t=yes,  mysql_cv_have_mbstate_t=no)])
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if test $mysql_cv_have_mbstate_t = yes; then
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        AC_DEFINE([HAVE_MBSTATE_T],[],[Define if mysql_cv_have_mbstate_t=yes])
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fi
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AC_CACHE_CHECK([for nl_langinfo and CODESET], mysql_cv_langinfo_codeset,
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[AC_TRY_LINK(
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[#include <langinfo.h>],
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[char* cs = nl_langinfo(CODESET);],
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mysql_cv_langinfo_codeset=yes, mysql_cv_langinfo_codeset=no)])
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if test $mysql_cv_langinfo_codeset = yes; then
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  AC_DEFINE([HAVE_LANGINFO_CODESET],[],[Define if mysql_cv_langinfo_codeset=yes])
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fi
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])