diff --git a/src/libstdc++-v3/config/os/gnu/ctype_configure_char.cc b/src/libstdc++-v3/config/os/gnu/ctype_configure_char.cc
new file mode 100644
index 00000000000..5a88fc11ab3
--- /dev/null
+++ b/src/libstdc++-v3/config/os/gnu/ctype_configure_char.cc
@@ -0,0 +1,196 @@
+// Locale support -*- C++ -*-
+
+// Copyright (C) 2011-2022 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// .
+
+/** @file ctype_configure_char.cc */
+
+//
+// ISO C++ 14882: 22.1 Locales
+//
+
+#include
+#include
+#include
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+// Information as gleaned from /usr/include/ctype.h
+
+#if _GLIBCXX_C_LOCALE_GNU
+ const ctype_base::mask*
+ ctype::classic_table() throw()
+ { return _S_get_c_locale()->__ctype_b; }
+#else
+ const ctype_base::mask*
+ ctype::classic_table() throw()
+ {
+ const ctype_base::mask* __ret;
+ char* __old = setlocale(LC_CTYPE, NULL);
+ char* __sav = NULL;
+ if (__builtin_strcmp(__old, "C"))
+ {
+ const size_t __len = __builtin_strlen(__old) + 1;
+ __sav = new char[__len];
+ __builtin_memcpy(__sav, __old, __len);
+ setlocale(LC_CTYPE, "C");
+ }
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
+ __ret = *__ctype_b_loc();
+#else
+ __ret = __ctype_b;
+#endif
+ if (__sav)
+ {
+ setlocale(LC_CTYPE, __sav);
+ delete [] __sav;
+ }
+ return __ret;
+ }
+#endif
+
+#if _GLIBCXX_C_LOCALE_GNU
+ ctype::ctype(__c_locale __cloc, const mask* __table, bool __del,
+ size_t __refs)
+ : facet(__refs), _M_c_locale_ctype(_S_clone_c_locale(__cloc)),
+ _M_del(__table != 0 && __del),
+ _M_toupper(_M_c_locale_ctype->__ctype_toupper),
+ _M_tolower(_M_c_locale_ctype->__ctype_tolower),
+ _M_table(__table ? __table : _M_c_locale_ctype->__ctype_b),
+ _M_widen_ok(0), _M_narrow_ok(0)
+ {
+ __builtin_memset(_M_widen, 0, sizeof(_M_widen));
+ __builtin_memset(_M_narrow, 0, sizeof(_M_narrow));
+ }
+#else
+ ctype::ctype(__c_locale, const mask* __table, bool __del,
+ size_t __refs)
+ : facet(__refs), _M_c_locale_ctype(_S_get_c_locale()),
+ _M_del(__table != 0 && __del), _M_widen_ok(0), _M_narrow_ok(0)
+ {
+ char* __old = setlocale(LC_CTYPE, NULL);
+ char* __sav = NULL;
+ if (__builtin_strcmp(__old, "C"))
+ {
+ const size_t __len = __builtin_strlen(__old) + 1;
+ __sav = new char[__len];
+ __builtin_memcpy(__sav, __old, __len);
+ setlocale(LC_CTYPE, "C");
+ }
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
+ _M_toupper = *__ctype_toupper_loc();
+ _M_tolower = *__ctype_tolower_loc();
+ _M_table = __table ? __table : *__ctype_b_loc();
+#else
+ _M_toupper = __ctype_toupper;
+ _M_tolower = __ctype_tolower;
+ _M_table = __table ? __table : __ctype_b;
+#endif
+ if (__sav)
+ {
+ setlocale(LC_CTYPE, __sav);
+ delete [] __sav;
+ }
+ __builtin_memset(_M_widen, 0, sizeof(_M_widen));
+ __builtin_memset(_M_narrow, 0, sizeof(_M_narrow));
+ }
+#endif
+
+#if _GLIBCXX_C_LOCALE_GNU
+ ctype::ctype(const mask* __table, bool __del, size_t __refs)
+ : facet(__refs), _M_c_locale_ctype(_S_get_c_locale()),
+ _M_del(__table != 0 && __del),
+ _M_toupper(_M_c_locale_ctype->__ctype_toupper),
+ _M_tolower(_M_c_locale_ctype->__ctype_tolower),
+ _M_table(__table ? __table : _M_c_locale_ctype->__ctype_b),
+ _M_widen_ok(0), _M_narrow_ok(0)
+ {
+ __builtin_memset(_M_widen, 0, sizeof(_M_widen));
+ __builtin_memset(_M_narrow, 0, sizeof(_M_narrow));
+ }
+#else
+ ctype::ctype(const mask* __table, bool __del, size_t __refs)
+ : facet(__refs), _M_c_locale_ctype(_S_get_c_locale()),
+ _M_del(__table != 0 && __del), _M_widen_ok(0), _M_narrow_ok(0)
+ {
+ char* __old = setlocale(LC_CTYPE, NULL);
+ char* __sav = NULL;
+ if (__builtin_strcmp(__old, "C"))
+ {
+ const size_t __len = __builtin_strlen(__old) + 1;
+ __sav = new char[__len];
+ __builtin_memcpy(__sav, __old, __len);
+ setlocale(LC_CTYPE, "C");
+ }
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
+ _M_toupper = *__ctype_toupper_loc();
+ _M_tolower = *__ctype_tolower_loc();
+ _M_table = __table ? __table : *__ctype_b_loc();
+#else
+ _M_toupper = __ctype_toupper;
+ _M_tolower = __ctype_tolower;
+ _M_table = __table ? __table : __ctype_b;
+#endif
+ if (__sav)
+ {
+ setlocale(LC_CTYPE, __sav);
+ delete [] __sav;
+ }
+ __builtin_memset(_M_widen, 0, sizeof(_M_widen));
+ __builtin_memset(_M_narrow, 0, sizeof(_M_narrow));
+ }
+#endif
+
+ char
+ ctype::do_toupper(char __c) const
+ { return _M_toupper[static_cast(__c)]; }
+
+ const char*
+ ctype::do_toupper(char* __low, const char* __high) const
+ {
+ while (__low < __high)
+ {
+ *__low = _M_toupper[static_cast(*__low)];
+ ++__low;
+ }
+ return __high;
+ }
+
+ char
+ ctype::do_tolower(char __c) const
+ { return _M_tolower[static_cast(__c)]; }
+
+ const char*
+ ctype::do_tolower(char* __low, const char* __high) const
+ {
+ while (__low < __high)
+ {
+ *__low = _M_tolower[static_cast(*__low)];
+ ++__low;
+ }
+ return __high;
+ }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace