Not all of the necessary tests for multi-byte support in readline

were included in the configure tests. (Bug #46310)

config/ac-macros/readline.m4

@@ -70,12 +70,16 @@ AC_CHECK_HEADERS(wctype.h)
 AC_CHECK_HEADERS(wchar.h)
 AC_CHECK_HEADERS(langinfo.h)
 
-AC_CHECK_FUNC(mbsrtowcs, AC_DEFINE([HAVE_MBSRTOWCS],[],[Define if you have mbsrtowcs]))
-AC_CHECK_FUNC(mbrtowc, AC_DEFINE([HAVE_MBRTOWC],[],[Define if you have mbrtowc]))
-AC_CHECK_FUNC(mbrlen, AC_DEFINE([HAVE_MBRLEN],[],[Define if you have mbrlen]))
-AC_CHECK_FUNC(wctomb, AC_DEFINE([HAVE_WCTOMB],[],[Define if you have wctomb]))
-AC_CHECK_FUNC(wcwidth, AC_DEFINE([HAVE_WCWIDTH],[],[Define if you have wcwidth]))
-AC_CHECK_FUNC(wcsdup, AC_DEFINE([HAVE_WCSDUP],[],[Define if you check wcsdup]))
+AC_CHECK_FUNC(mbrlen, AC_DEFINE(HAVE_MBRLEN,[],[Define if you have mbrlen]))
+AC_CHECK_FUNC(mbscmp, AC_DEFINE(HAVE_MBSCMP,[],[Define if you have mbscmp]))
+AC_CHECK_FUNC(mbsrtowcs, AC_DEFINE(HAVE_MBSRTOWCS,[],[Define if you have mbsrtowcs]))
+
+AC_CHECK_FUNC(wcrtomb, AC_DEFINE(HAVE_WCRTOMB,[],[Define if you have wcrtomb]))
+AC_CHECK_FUNC(mbrtowc, AC_DEFINE(HAVE_MBRTOWC,[],[Define if you have mbrtowc]))
+AC_CHECK_FUNC(wcscoll, AC_DEFINE(HAVE_WCSCOLL,[],[Define if you have wcscoll]))
+AC_CHECK_FUNC(wcsdup, AC_DEFINE(HAVE_WCSDUP,[],[Define if you have wcsdup]))
+AC_CHECK_FUNC(wcwidth, AC_DEFINE(HAVE_WCWIDTH,[],[Define if you have wcwidth]))
+AC_CHECK_FUNC(wctype, AC_DEFINE(HAVE_WCTYPE,[],[Define if you have wctype]))
 
 AC_CACHE_CHECK([for mbstate_t], mysql_cv_have_mbstate_t,
 [AC_TRY_COMPILE([
@@ -88,6 +92,8 @@ if test $mysql_cv_have_mbstate_t = yes; then
         AC_DEFINE([HAVE_MBSTATE_T],[],[Define if mysql_cv_have_mbstate_t=yes])
 fi
 
+AC_CHECK_FUNCS(iswlower iswupper towlower towupper iswctype)
+
 AC_CACHE_CHECK([for nl_langinfo and CODESET], mysql_cv_langinfo_codeset,
 [AC_TRY_LINK(
 [#include <langinfo.h>],
@@ -97,4 +103,41 @@ if test $mysql_cv_langinfo_codeset = yes; then
   AC_DEFINE([HAVE_LANGINFO_CODESET],[],[Define if mysql_cv_langinfo_codeset=yes])
 fi
 
+dnl check for wchar_t in <wchar.h>
+AC_CACHE_CHECK([for wchar_t in wchar.h], bash_cv_type_wchar_t,
+[AC_TRY_COMPILE(
+[#include <wchar.h>
+],
+[
+        wchar_t foo;
+        foo = 0;
+], bash_cv_type_wchar_t=yes, bash_cv_type_wchar_t=no)])
+if test $bash_cv_type_wchar_t = yes; then
+        AC_DEFINE(HAVE_WCHAR_T, 1, [systems should define this type here])
+fi
+
+dnl check for wctype_t in <wctype.h>
+AC_CACHE_CHECK([for wctype_t in wctype.h], bash_cv_type_wctype_t,
+[AC_TRY_COMPILE(
+[#include <wctype.h>],
+[
+        wctype_t foo;
+        foo = 0;
+], bash_cv_type_wctype_t=yes, bash_cv_type_wctype_t=no)])
+if test $bash_cv_type_wctype_t = yes; then
+        AC_DEFINE(HAVE_WCTYPE_T, 1, [systems should define this type here])
+fi
+
+dnl check for wint_t in <wctype.h>
+AC_CACHE_CHECK([for wint_t in wctype.h], bash_cv_type_wint_t,
+[AC_TRY_COMPILE(
+[#include <wctype.h>],
+[
+        wint_t foo;
+        foo = 0;
+], bash_cv_type_wint_t=yes, bash_cv_type_wint_t=no)])
+if test $bash_cv_type_wint_t = yes; then
+        AC_DEFINE(HAVE_WINT_T, 1, [systems should define this type here])
+fi
+
 ])