[RFC] libstdc++: add #pragma diagnostic

diff --git a/libstdc++-v3/include/bits/algorithmfwd.h b/libstdc++-v3/include/bits/algorithmfwd.h
index 34bf9921f43..7f1f15970ab 100644
--- a/libstdc++-v3/include/bits/algorithmfwd.h
+++ b/libstdc++-v3/include/bits/algorithmfwd.h
@@ -39,6 +39,9 @@ 
 #include <initializer_list>
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -962,6 +965,8 @@  _GLIBCXX_END_NAMESPACE_ALGO
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #ifdef _GLIBCXX_PARALLEL
 # include <parallel/algorithmfwd.h>
 #endif
diff --git a/libstdc++-v3/include/bits/allocator.h b/libstdc++-v3/include/bits/allocator.h
index 9e75b37fce7..ebb487a3ffe 100644
--- a/libstdc++-v3/include/bits/allocator.h
+++ b/libstdc++-v3/include/bits/allocator.h
@@ -49,6 +49,9 @@ 
 #include <type_traits>
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -292,4 +295,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/codecvt.h b/libstdc++-v3/include/bits/codecvt.h
index 41a1d30b11d..c51cc7d220d 100644
--- a/libstdc++-v3/include/bits/codecvt.h
+++ b/libstdc++-v3/include/bits/codecvt.h
@@ -41,6 +41,9 @@ 
 #include <bits/c++config.h>
 #include <bits/locale_classes.h> // locale::facet
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -840,4 +843,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif // _CODECVT_H
diff --git a/libstdc++-v3/include/bits/concept_check.h b/libstdc++-v3/include/bits/concept_check.h
index 65f662b70bf..6479f2fa919 100644
--- a/libstdc++-v3/include/bits/concept_check.h
+++ b/libstdc++-v3/include/bits/concept_check.h
@@ -34,6 +34,9 @@ 
 
 #include <bits/c++config.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wvariadic-macros"
+
 // All places in libstdc++-v3 where these are used, or /might/ be used, or
 // don't need to be used, or perhaps /should/ be used, are commented with
 // "concept requirements" (and maybe some more text).  So grep like crazy
@@ -78,4 +81,5 @@ 
 
 #endif // enable/disable
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_CONCEPT_CHECK
diff --git a/libstdc++-v3/include/bits/cpp_type_traits.h b/libstdc++-v3/include/bits/cpp_type_traits.h
index ff74c557245..e3a80e06346 100644
--- a/libstdc++-v3/include/bits/cpp_type_traits.h
+++ b/libstdc++-v3/include/bits/cpp_type_traits.h
@@ -40,6 +40,9 @@ 
 # include <type_traits> // is_same_v, is_integral_v
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wlong-long"
+
 //
 // This file provides some compile-time information about various types.
 // These representations were designed, on purpose, to be constant-expressions
@@ -582,4 +585,6 @@  _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 } // extern "C++"
 
+#pragma GCC diagnostic pop
+
 #endif //_CPP_TYPE_TRAITS_H
diff --git a/libstdc++-v3/include/bits/hashtable.h b/libstdc++-v3/include/bits/hashtable.h
index 361da2b3b4d..b02bddf5635 100644
--- a/libstdc++-v3/include/bits/hashtable.h
+++ b/libstdc++-v3/include/bits/hashtable.h
@@ -40,6 +40,9 @@ 
 # include <bits/node_handle.h>
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -2758,4 +2761,6 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #endif // _HASHTABLE_H
diff --git a/libstdc++-v3/include/bits/iterator_concepts.h b/libstdc++-v3/include/bits/iterator_concepts.h
index 642c709fee0..4ac6e6bfbe7 100644
--- a/libstdc++-v3/include/bits/iterator_concepts.h
+++ b/libstdc++-v3/include/bits/iterator_concepts.h
@@ -37,6 +37,9 @@ 
 #include <bits/ptr_traits.h>	// to_address
 #include <bits/ranges_cmp.h>	// identity, ranges::less
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -1044,5 +1047,6 @@  namespace ranges
 #endif // C++20 library concepts
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
+#pragma GCC diagnostic pop
 #endif // C++20
 #endif // _ITERATOR_CONCEPTS_H
diff --git a/libstdc++-v3/include/bits/ostream_insert.h b/libstdc++-v3/include/bits/ostream_insert.h
index e6857615790..d61b4b14f97 100644
--- a/libstdc++-v3/include/bits/ostream_insert.h
+++ b/libstdc++-v3/include/bits/ostream_insert.h
@@ -36,6 +36,9 @@ 
 #include <bits/cxxabi_forced.h>
 #include <bits/exception_defines.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -131,4 +134,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif /* _OSTREAM_INSERT_H */
diff --git a/libstdc++-v3/include/bits/ranges_base.h b/libstdc++-v3/include/bits/ranges_base.h
index 63eb552b48b..0c6a4e83bb2 100644
--- a/libstdc++-v3/include/bits/ranges_base.h
+++ b/libstdc++-v3/include/bits/ranges_base.h
@@ -39,6 +39,9 @@ 
 #include <bits/max_size_type.h>
 #include <bits/version.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+
 #ifdef __cpp_lib_concepts
 namespace std _GLIBCXX_VISIBILITY(default)
 {
@@ -1073,5 +1076,6 @@  namespace ranges
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 #endif // library concepts
+#pragma GCC diagnostic pop
 #endif // C++20
 #endif // _GLIBCXX_RANGES_BASE_H
diff --git a/libstdc++-v3/include/bits/regex_automaton.h b/libstdc++-v3/include/bits/regex_automaton.h
index 574ec90dc3a..03179a0e687 100644
--- a/libstdc++-v3/include/bits/regex_automaton.h
+++ b/libstdc++-v3/include/bits/regex_automaton.h
@@ -33,6 +33,9 @@ 
 #define _GLIBCXX_REGEX_STATE_LIMIT 100000
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // anon struct
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -397,4 +400,6 @@  namespace __detail
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #include <bits/regex_automaton.tcc>
diff --git a/libstdc++-v3/include/bits/std_abs.h b/libstdc++-v3/include/bits/std_abs.h
index 48d44160bab..1e9ed83a0b2 100644
--- a/libstdc++-v3/include/bits/std_abs.h
+++ b/libstdc++-v3/include/bits/std_abs.h
@@ -43,6 +43,9 @@ 
 
 #undef abs
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wlong-long"
+
 extern "C++"
 {
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -151,4 +154,6 @@  _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 } // extern "C++"
 
+#pragma GCC diagnostic pop
+
 #endif // _GLIBCXX_BITS_STD_ABS_H
diff --git a/libstdc++-v3/include/bits/stl_algo.h b/libstdc++-v3/include/bits/stl_algo.h
index 778a37ac46f..a1ef665506d 100644
--- a/libstdc++-v3/include/bits/stl_algo.h
+++ b/libstdc++-v3/include/bits/stl_algo.h
@@ -72,6 +72,9 @@ 
 # endif
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // inline namespace
+
 // See concept_check.h for the __glibcxx_*_requires macros.
 
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -5901,4 +5904,6 @@  _GLIBCXX_END_NAMESPACE_ALGO
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #endif /* _STL_ALGO_H */
diff --git a/libstdc++-v3/include/c_compatibility/fenv.h b/libstdc++-v3/include/c_compatibility/fenv.h
index 6800814bca5..a587e7308af 100644
--- a/libstdc++-v3/include/c_compatibility/fenv.h
+++ b/libstdc++-v3/include/c_compatibility/fenv.h
@@ -31,11 +31,16 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 #if _GLIBCXX_HAVE_FENV_H
 # include_next <fenv.h>
 #endif
 
+#pragma GCC diagnostic pop
+
 #if __cplusplus >= 201103L
 
 #if _GLIBCXX_USE_C99_FENV
diff --git a/libstdc++-v3/include/c_compatibility/inttypes.h b/libstdc++-v3/include/c_compatibility/inttypes.h
index bc63119097c..5a428ce0bd7 100644
--- a/libstdc++-v3/include/c_compatibility/inttypes.h
+++ b/libstdc++-v3/include/c_compatibility/inttypes.h
@@ -31,6 +31,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 
 #if __cplusplus >= 201103L
@@ -88,4 +91,6 @@  namespace std
 
 #endif // C++11
 
+#pragma GCC diagnostic pop
+
 #endif // _GLIBCXX_INTTYPES_H
diff --git a/libstdc++-v3/include/c_compatibility/stdint.h b/libstdc++-v3/include/c_compatibility/stdint.h
index 0b6a8c16627..2d892e7ceb2 100644
--- a/libstdc++-v3/include/c_compatibility/stdint.h
+++ b/libstdc++-v3/include/c_compatibility/stdint.h
@@ -31,6 +31,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 
 #if __cplusplus >= 201103L
@@ -107,4 +110,6 @@  namespace std
 
 #endif // C++11
 
+#pragma GCC diagnostic pop
+
 #endif // _GLIBCXX_STDINT_H
diff --git a/libstdc++-v3/include/ext/concurrence.h b/libstdc++-v3/include/ext/concurrence.h
index 7629c1b1129..8188c1366b0 100644
--- a/libstdc++-v3/include/ext/concurrence.h
+++ b/libstdc++-v3/include/ext/concurrence.h
@@ -37,6 +37,9 @@ 
 #include <bits/cpp_type_traits.h>
 #include <ext/type_traits.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -312,4 +315,6 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/ext/type_traits.h b/libstdc++-v3/include/ext/type_traits.h
index 75d7edf85b8..165e1b43da0 100644
--- a/libstdc++-v3/include/ext/type_traits.h
+++ b/libstdc++-v3/include/ext/type_traits.h
@@ -34,6 +34,9 @@ 
 #include <bits/c++config.h>
 #include <bits/cpp_type_traits.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wlong-long"
+
 extern "C++" {
 
 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
@@ -270,4 +273,6 @@  _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 } // extern "C++"
 
+#pragma GCC diagnostic pop
+
 #endif 
diff --git a/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_floating_neg.cc b/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_floating_neg.cc
index 261fe84b0ae..458748af28a 100644
--- a/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_floating_neg.cc
+++ b/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_floating_neg.cc
@@ -35,4 +35,4 @@  int main()
 }
 
 // { dg-error "required from" "" { target *-*-* } 28 }
-// { dg-error "no type" "" { target *-*-* } 71 } 
+// { dg-error "no type" "" { target *-*-* } 74 }
diff --git a/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_integer_neg.cc b/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_integer_neg.cc
index f592478dd97..c1dde44e118 100644
--- a/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_integer_neg.cc
+++ b/libstdc++-v3/testsuite/ext/type_traits/add_unsigned_integer_neg.cc
@@ -36,5 +36,5 @@  int main()
 }
 
 // { dg-error "invalid use of incomplete" "" { target *-*-* } 28 } 
-// { dg-error "declaration of" "" { target *-*-* } 100 }
 // { dg-error "declaration of" "" { target *-*-* } 103 }
+// { dg-error "declaration of" "" { target *-*-* } 106 }
diff --git a/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_floating_neg.cc b/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_floating_neg.cc
index 42078e556f6..5f77c1a652a 100644
--- a/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_floating_neg.cc
+++ b/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_floating_neg.cc
@@ -35,4 +35,4 @@  int main()
 }
 
 // { dg-error "required from" "" { target *-*-* } 28 }
-// { dg-error "no type" "" { target *-*-* } 114 }
+// { dg-error "no type" "" { target *-*-* } 117 }
diff --git a/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_integer_neg.cc b/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_integer_neg.cc
index f017aecdb8a..7f5a304c526 100644
--- a/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_integer_neg.cc
+++ b/libstdc++-v3/testsuite/ext/type_traits/remove_unsigned_integer_neg.cc
@@ -36,5 +36,5 @@  int main()
 }
 
 // { dg-error "invalid use of incomplete" "" { target *-*-* } 28 } 
-// { dg-error "declaration of" "" { target *-*-* } 143 }
 // { dg-error "declaration of" "" { target *-*-* } 146 }
+// { dg-error "declaration of" "" { target *-*-* } 149 }
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index e4ed583b3ae..768c2991ec2 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -707,7 +707,7 @@  AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
   # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
   AC_SUBST(OPTIMIZE_CXXFLAGS)
 
-  WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
+  WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=19 -Wsystem-headers"
   AC_SUBST(WARN_FLAGS)
 ])
 
diff --git a/libstdc++-v3/include/bits/basic_ios.tcc b/libstdc++-v3/include/bits/basic_ios.tcc
index 0197bdf8f67..1519603f6b5 100644
--- a/libstdc++-v3/include/bits/basic_ios.tcc
+++ b/libstdc++-v3/include/bits/basic_ios.tcc
@@ -32,6 +32,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -181,4 +184,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc
index e458c1880b2..8a764855698 100644
--- a/libstdc++-v3/include/bits/basic_string.tcc
+++ b/libstdc++-v3/include/bits/basic_string.tcc
@@ -41,6 +41,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 #include <bits/cxxabi_forced.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -1031,4 +1034,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/fstream.tcc b/libstdc++-v3/include/bits/fstream.tcc
index a5accecd846..7b246ad59d2 100644
--- a/libstdc++-v3/include/bits/fstream.tcc
+++ b/libstdc++-v3/include/bits/fstream.tcc
@@ -36,6 +36,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 #include <bits/cxxabi_forced.h>
 #include <bits/move.h>   // for swap
 #include <cerrno>
@@ -1094,4 +1097,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/istream.tcc b/libstdc++-v3/include/bits/istream.tcc
index 16423bfbfcb..23a7c849777 100644
--- a/libstdc++-v3/include/bits/istream.tcc
+++ b/libstdc++-v3/include/bits/istream.tcc
@@ -36,6 +36,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 #include <bits/cxxabi_forced.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -1166,4 +1169,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/locale_classes.tcc b/libstdc++-v3/include/bits/locale_classes.tcc
index d5ef1911057..4dedfd76af6 100644
--- a/libstdc++-v3/include/bits/locale_classes.tcc
+++ b/libstdc++-v3/include/bits/locale_classes.tcc
@@ -36,6 +36,10 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+#pragma GCC diagnostic ignored "-Wvariadic-macros"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -380,4 +384,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/locale_facets.tcc b/libstdc++-v3/include/bits/locale_facets.tcc
index cde81bffc08..4e9bf6fb8f9 100644
--- a/libstdc++-v3/include/bits/locale_facets.tcc
+++ b/libstdc++-v3/include/bits/locale_facets.tcc
@@ -32,6 +32,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -1433,4 +1436,5 @@  _GLIBCXX_END_NAMESPACE_LDBL
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/ostream.tcc b/libstdc++-v3/include/bits/ostream.tcc
index 972de79ea70..7aeb23ad38d 100644
--- a/libstdc++-v3/include/bits/ostream.tcc
+++ b/libstdc++-v3/include/bits/ostream.tcc
@@ -36,6 +36,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 #include <bits/cxxabi_forced.h>
 
 namespace std _GLIBCXX_VISIBILITY(default)
@@ -390,4 +393,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/regex_compiler.tcc b/libstdc++-v3/include/bits/regex_compiler.tcc
index 3c6cb6649df..9c5a46a47cd 100644
--- a/libstdc++-v3/include/bits/regex_compiler.tcc
+++ b/libstdc++-v3/include/bits/regex_compiler.tcc
@@ -55,6 +55,9 @@ 
 // All dummy nodes will be eliminated at the end of compilation.
 */
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++20-extensions" // variadic macro with 0 args
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -621,4 +624,6 @@  namespace __detail
 } // namespace __detail
 
 _GLIBCXX_END_NAMESPACE_VERSION
-} // namespace
+} // namespace std
+
+#pragma GCC diagnostic pop
diff --git a/libstdc++-v3/include/bits/sstream.tcc b/libstdc++-v3/include/bits/sstream.tcc
index 9acf15f399f..7eb5561b630 100644
--- a/libstdc++-v3/include/bits/sstream.tcc
+++ b/libstdc++-v3/include/bits/sstream.tcc
@@ -36,6 +36,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -304,4 +307,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/include/bits/streambuf.tcc b/libstdc++-v3/include/bits/streambuf.tcc
index 3cfee68defc..0c28033f491 100644
--- a/libstdc++-v3/include/bits/streambuf.tcc
+++ b/libstdc++-v3/include/bits/streambuf.tcc
@@ -36,6 +36,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -166,4 +169,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
 #endif
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 005c4a29fd0..de05e63de4c 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -55720,7 +55720,7 @@  $as_echo "$gxx_include_dir" >&6; }
   # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
 
 
-  WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
+  WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=19 -Wsystem-headers"
 
 
 
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 54d455be226..66d03cfd037 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -32,6 +32,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wvariadic-macros"
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+#pragma GCC diagnostic ignored "-Wc++23-extensions" // bf16
+
 // The major release number for the GCC release the C++ library belongs to.
 #define _GLIBCXX_RELEASE
 
@@ -910,4 +915,6 @@  namespace __gnu_cxx
 #endif // __has_include
 #endif // C++17
 
+#pragma GCC diagnostic pop
+
 // End of prewritten config; the settings discovered at configure time follow.
diff --git a/libstdc++-v3/include/c/cassert b/libstdc++-v3/include/c/cassert
index 5cd11fff9ec..ef6e844a72b 100644
--- a/libstdc++-v3/include/c/cassert
+++ b/libstdc++-v3/include/c/cassert
@@ -30,5 +30,10 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 #include_next <assert.h>
+
+#pragma GCC diagnostic pop
diff --git a/libstdc++-v3/include/c/cctype b/libstdc++-v3/include/c/cctype
index c6f65039435..a7a59551d86 100644
--- a/libstdc++-v3/include/c/cctype
+++ b/libstdc++-v3/include/c/cctype
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <ctype.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cerrno b/libstdc++-v3/include/c/cerrno
index 9e47b182d25..29bf0b403aa 100644
--- a/libstdc++-v3/include/c/cerrno
+++ b/libstdc++-v3/include/c/cerrno
@@ -40,9 +40,14 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 #include_next <errno.h>
 
+#pragma GCC diagnostic pop
+
 // Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
 #ifndef errno
 #define errno errno
diff --git a/libstdc++-v3/include/c/cfloat b/libstdc++-v3/include/c/cfloat
index 81d9772ed9f..1f9edada950 100644
--- a/libstdc++-v3/include/c/cfloat
+++ b/libstdc++-v3/include/c/cfloat
@@ -31,7 +31,12 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 #include_next <float.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/climits b/libstdc++-v3/include/c/climits
index 255bed41125..846fe190707 100644
--- a/libstdc++-v3/include/c/climits
+++ b/libstdc++-v3/include/c/climits
@@ -31,7 +31,12 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 #include_next <limits.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/clocale b/libstdc++-v3/include/c/clocale
index 4258df1958b..62d85ed6609 100644
--- a/libstdc++-v3/include/c/clocale
+++ b/libstdc++-v3/include/c/clocale
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <locale.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cmath b/libstdc++-v3/include/c/cmath
index 43020eee9d2..371ee59986c 100644
--- a/libstdc++-v3/include/c/cmath
+++ b/libstdc++-v3/include/c/cmath
@@ -33,8 +33,13 @@ 
 
 #include <bits/c++config.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <math.h>
 
+#pragma GCC diagnostic pop
+
 // Get rid of those macros defined in <math.h> in lieu of real functions.
 #undef abs
 #undef div
diff --git a/libstdc++-v3/include/c/csetjmp b/libstdc++-v3/include/c/csetjmp
index 4a5b0334590..acf113a0c5a 100644
--- a/libstdc++-v3/include/c/csetjmp
+++ b/libstdc++-v3/include/c/csetjmp
@@ -31,8 +31,13 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <setjmp.h>
 
+#pragma GCC diagnostic pop
+
 // Get rid of those macros defined in <setjmp.h> in lieu of real functions.
 #undef longjmp
 
diff --git a/libstdc++-v3/include/c/csignal b/libstdc++-v3/include/c/csignal
index 040b48368f9..c04bb6042f4 100644
--- a/libstdc++-v3/include/c/csignal
+++ b/libstdc++-v3/include/c/csignal
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <signal.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cstdarg b/libstdc++-v3/include/c/cstdarg
index 5d97e043da8..7648662680c 100644
--- a/libstdc++-v3/include/c/cstdarg
+++ b/libstdc++-v3/include/c/cstdarg
@@ -31,7 +31,12 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #undef __need___va_list
 #include_next <stdarg.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cstddef b/libstdc++-v3/include/c/cstddef
index 4fd889a1dff..e1435b94556 100644
--- a/libstdc++-v3/include/c/cstddef
+++ b/libstdc++-v3/include/c/cstddef
@@ -31,10 +31,15 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #define __need_size_t
 #define __need_ptrdiff_t
 #define __need_NULL
 #define __need_offsetof
 #include_next <stddef.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cstdio b/libstdc++-v3/include/c/cstdio
index 01293054d50..99aead4ef9c 100644
--- a/libstdc++-v3/include/c/cstdio
+++ b/libstdc++-v3/include/c/cstdio
@@ -31,8 +31,13 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <stdio.h>
 
+#pragma GCC diagnostic pop
+
 // Get rid of those macros defined in <stdio.h> in lieu of real functions.
 #undef clearerr
 #undef fclose
diff --git a/libstdc++-v3/include/c/cstdlib b/libstdc++-v3/include/c/cstdlib
index f5707f8a8ce..75e6382c01b 100644
--- a/libstdc++-v3/include/c/cstdlib
+++ b/libstdc++-v3/include/c/cstdlib
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <stdlib.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cstring b/libstdc++-v3/include/c/cstring
index 0082080fcab..05d75182a7a 100644
--- a/libstdc++-v3/include/c/cstring
+++ b/libstdc++-v3/include/c/cstring
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <string.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/ctime b/libstdc++-v3/include/c/ctime
index 5476ff7da39..73e2a7a0167 100644
--- a/libstdc++-v3/include/c/ctime
+++ b/libstdc++-v3/include/c/ctime
@@ -31,6 +31,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include_next <time.h>
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c/cwchar b/libstdc++-v3/include/c/cwchar
index 7a62eb74abb..921de267750 100644
--- a/libstdc++-v3/include/c/cwchar
+++ b/libstdc++-v3/include/c/cwchar
@@ -35,10 +35,15 @@ 
 #include <cstddef>
 #include <ctime>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #if _GLIBCXX_HAVE_WCHAR_H
 #include_next <wchar.h>
 #endif
 
+#pragma GCC diagnostic pop
+
 // Need to do a bit of trickery here with mbstate_t as char_traits
 // assumes it is in wchar.h, regardless of wchar_t specializations.
 #ifndef _GLIBCXX_HAVE_MBSTATE_T
diff --git a/libstdc++-v3/include/c/cwctype b/libstdc++-v3/include/c/cwctype
index 011ceadbb1b..0d2f55d9d6d 100644
--- a/libstdc++-v3/include/c/cwctype
+++ b/libstdc++-v3/include/c/cwctype
@@ -31,10 +31,15 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
+
 #include <bits/c++config.h>
 
 #if _GLIBCXX_HAVE_WCTYPE_H
 #include_next <wctype.h>
 #endif
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c_global/climits b/libstdc++-v3/include/c_global/climits
index 7e374ef0c79..c85fc283ae6 100644
--- a/libstdc++-v3/include/c_global/climits
+++ b/libstdc++-v3/include/c_global/climits
@@ -44,6 +44,9 @@ 
 #ifndef _GLIBCXX_CLIMITS
 #define _GLIBCXX_CLIMITS 1
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wlong-long"
+
 #ifndef LLONG_MIN
 #define LLONG_MIN (-__LONG_LONG_MAX__ - 1)
 #endif
@@ -56,4 +59,6 @@ 
 #define ULLONG_MAX (__LONG_LONG_MAX__ * 2ULL + 1)
 #endif
 
+#pragma GCC diagnostic pop
+
 #endif
diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
index dd0174f1987..4958dfd2ff1 100644
--- a/libstdc++-v3/include/c_global/cmath
+++ b/libstdc++-v3/include/c_global/cmath
@@ -43,9 +43,14 @@ 
 #include <bits/c++config.h>
 #include <bits/cpp_type_traits.h>
 #include <ext/type_traits.h>
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
 #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
 #include_next <math.h>
 #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#pragma GCC diagnostic pop
+
 #include <bits/std_abs.h>
 
 #ifndef _GLIBCXX_CMATH
diff --git a/libstdc++-v3/include/c_global/cstddef b/libstdc++-v3/include/c_global/cstddef
index b25a6b3eec9..f49f56ae372 100644
--- a/libstdc++-v3/include/c_global/cstddef
+++ b/libstdc++-v3/include/c_global/cstddef
@@ -52,6 +52,9 @@ 
 #define __glibcxx_want_byte
 #include <bits/version.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+
 extern "C++"
 {
 #if __cplusplus >= 201103L
@@ -189,4 +192,6 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #endif // __cpp_lib_byte
 } // extern "C++"
 
+#pragma GCC diagnostic pop
+
 #endif // _GLIBCXX_CSTDDEF
diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
index 69e7a39eb44..72baff24991 100644
--- a/libstdc++-v3/include/c_global/cstdlib
+++ b/libstdc++-v3/include/c_global/cstdlib
@@ -75,9 +75,13 @@  namespace std
 
 // Need to ensure this finds the C library's <stdlib.h> not a libstdc++
 // wrapper that might already be installed later in the include search path.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // include_next
 #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
 #include_next <stdlib.h>
 #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
+#pragma GCC diagnostic pop
+
 #include <bits/std_abs.h>
 
 // Get rid of those macros defined in <stdlib.h> in lieu of real functions.
diff --git a/libstdc++-v3/include/decimal/decimal b/libstdc++-v3/include/decimal/decimal
index d20e012f9c5..a64ddde4756 100644
--- a/libstdc++-v3/include/decimal/decimal
+++ b/libstdc++-v3/include/decimal/decimal
@@ -33,6 +33,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // DF suffix
+
 #include <bits/c++config.h>
 
 #ifndef _GLIBCXX_USE_DECIMAL_FLOAT
@@ -491,4 +494,5 @@  _GLIBCXX_END_NAMESPACE_VERSION
 
 #include <decimal/decimal.h>
 
+#pragma GCC diagnostic pop
 #endif /* _GLIBCXX_DECIMAL */
diff --git a/libstdc++-v3/include/ext/rope b/libstdc++-v3/include/ext/rope
index b5ebb132274..19199e82806 100644
--- a/libstdc++-v3/include/ext/rope
+++ b/libstdc++-v3/include/ext/rope
@@ -66,6 +66,10 @@ 
 
 #include <ext/memory> // For uninitialized_copy_n
 
+// Ignore warnings about default member initializers.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -3009,6 +3013,8 @@  namespace tr1
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 # include <ext/ropeimpl.h>
 
 #endif
diff --git a/libstdc++-v3/include/std/any b/libstdc++-v3/include/std/any
index 9ae29aab99f..d24260eaace 100644
--- a/libstdc++-v3/include/std/any
+++ b/libstdc++-v3/include/std/any
@@ -42,6 +42,9 @@ 
 #include <type_traits>
 #include <bits/utility.h> // in_place_type_t
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations" // aligned_storage
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -661,5 +664,7 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #endif // __cpp_lib_any
 #endif // _GLIBCXX_ANY
diff --git a/libstdc++-v3/include/std/charconv b/libstdc++-v3/include/std/charconv
index 00c4f206922..de671393b88 100644
--- a/libstdc++-v3/include/std/charconv
+++ b/libstdc++-v3/include/std/charconv
@@ -31,6 +31,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+
 #include <bits/requires_hosted.h> // for error codes
 
 // As an extension we support <charconv> in C++14, but this header should not
@@ -932,4 +935,5 @@  namespace __detail
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 #endif // C++14
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_CHARCONV
diff --git a/libstdc++-v3/include/std/complex b/libstdc++-v3/include/std/complex
index be810b6d05d..c688d0cb728 100644
--- a/libstdc++-v3/include/std/complex
+++ b/libstdc++-v3/include/std/complex
@@ -38,6 +38,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // extern template
+
 #include <bits/c++config.h>
 #include <bits/cpp_type_traits.h>
 #include <ext/type_traits.h>
@@ -2650,4 +2653,5 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #pragma clang diagnostic pop
 #endif
 
+#pragma GCC diagnostic pop
 #endif  /* _GLIBCXX_COMPLEX */
diff --git a/libstdc++-v3/include/std/coroutine b/libstdc++-v3/include/std/coroutine
index ccd016b255e..30b4d33711e 100644
--- a/libstdc++-v3/include/std/coroutine
+++ b/libstdc++-v3/include/std/coroutine
@@ -31,6 +31,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++17-extensions"
+
 #define __glibcxx_want_coroutine
 #include <bits/version.h>
 
@@ -358,4 +361,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #endif // __cpp_lib_coroutine
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_COROUTINE
diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 52243eb5479..88a42d1158a 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -63,6 +63,10 @@ 
 # include <cctype>
 #endif
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+#pragma GCC diagnostic ignored "-Wc++23-extensions" // bf16
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -1674,6 +1678,10 @@  namespace __format
 
 	      do
 		{
+		  // Mangling of this lambda, and thus resize_and_overwrite
+		  // instantiated with it, was fixed in ABI 18 (G++ 13).  Since
+		  // <format> was new in G++ 13, and is experimental, that
+		  // isn't a problem.
 		  auto __overwrite = [&__to_chars, &__res] (char* __p, size_t __n)
 		  {
 		    __res = __to_chars(__p + 1, __p + __n - 1);
@@ -4734,4 +4742,5 @@  namespace __format
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 #endif // __cpp_lib_format
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_FORMAT
diff --git a/libstdc++-v3/include/std/iomanip b/libstdc++-v3/include/std/iomanip
index fdf80fc8b50..9d8ecea5d65 100644
--- a/libstdc++-v3/include/std/iomanip
+++ b/libstdc++-v3/include/std/iomanip
@@ -35,6 +35,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 #include <bits/requires_hosted.h> // iostreams
 
 #include <bits/c++config.h>
@@ -543,4 +546,5 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
+#pragma GCC diagnostic pop
 #endif /* _GLIBCXX_IOMANIP */
diff --git a/libstdc++-v3/include/std/limits b/libstdc++-v3/include/std/limits
index 4b0698e4713..b0ab57c1ad7 100644
--- a/libstdc++-v3/include/std/limits
+++ b/libstdc++-v3/include/std/limits
@@ -39,6 +39,11 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // Q suffix
+#pragma GCC diagnostic ignored "-Wlong-long"
+#pragma GCC diagnostic ignored "-Wc++23-extensions"
+
 #include <bits/c++config.h>
 
 //
@@ -2229,4 +2234,5 @@  _GLIBCXX_END_NAMESPACE_VERSION
 #undef __glibcxx_digits10
 #undef __glibcxx_max_digits10
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_NUMERIC_LIMITS
diff --git a/libstdc++-v3/include/std/numbers b/libstdc++-v3/include/std/numbers
index 9836afac645..f04000f1dd9 100644
--- a/libstdc++-v3/include/std/numbers
+++ b/libstdc++-v3/include/std/numbers
@@ -38,6 +38,9 @@ 
 
 #include <type_traits>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // Q extension
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -232,5 +235,7 @@  __glibcxx_numbers (__float128, Q);
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #endif // __cpp_lib_math_constants
 #endif // _GLIBCXX_NUMBERS
diff --git a/libstdc++-v3/include/tr1/functional b/libstdc++-v3/include/tr1/functional
index 5fc808623a7..f2cd42bed4e 100644
--- a/libstdc++-v3/include/tr1/functional
+++ b/libstdc++-v3/include/tr1/functional
@@ -44,6 +44,10 @@ 
 #include <ext/type_traits.h>
 #include <bits/move.h> // for std::__addressof
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wvolatile" // volatile parm/return
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -2282,4 +2286,5 @@  namespace tr1
 _GLIBCXX_END_NAMESPACE_VERSION
 }
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_TR1_FUNCTIONAL
diff --git a/libstdc++-v3/include/tr1/tuple b/libstdc++-v3/include/tr1/tuple
index be26d283f8c..40e2d091514 100644
--- a/libstdc++-v3/include/tr1/tuple
+++ b/libstdc++-v3/include/tr1/tuple
@@ -34,6 +34,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 #include <bits/requires_hosted.h> // TR1
 
 #include <utility>
@@ -425,4 +428,5 @@  namespace tr1
 _GLIBCXX_END_NAMESPACE_VERSION
 }
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_TR1_TUPLE
diff --git a/libstdc++-v3/include/tr1/type_traits b/libstdc++-v3/include/tr1/type_traits
index f5714b0032c..62b30e7d658 100644
--- a/libstdc++-v3/include/tr1/type_traits
+++ b/libstdc++-v3/include/tr1/type_traits
@@ -31,6 +31,9 @@ 
 
 #pragma GCC system_header
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions"
+
 #include <bits/requires_hosted.h> // TR1
 
 #include <bits/c++config.h>
@@ -684,4 +687,5 @@  namespace tr1
 _GLIBCXX_END_NAMESPACE_VERSION
 }
 
+#pragma GCC diagnostic pop
 #endif // _GLIBCXX_TR1_TYPE_TRAITS
diff --git a/libstdc++-v3/libsupc++/compare b/libstdc++-v3/libsupc++/compare
index 63ad6b5c23e..ac8ffdb6c5a 100644
--- a/libstdc++-v3/libsupc++/compare
+++ b/libstdc++-v3/libsupc++/compare
@@ -39,6 +39,10 @@ 
 
 #include <concepts>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic" // __int128
+#pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
   // [cmp.categories], comparison category types
@@ -1258,6 +1262,8 @@  namespace std _GLIBCXX_VISIBILITY(default)
 #endif // __cpp_lib_three_way_comparison >= 201907L
 } // namespace std
 
+#pragma GCC diagnostic pop
+
 #endif // C++20
 
 #endif // _COMPARE
diff --git a/libstdc++-v3/libsupc++/new b/libstdc++-v3/libsupc++/new
index 2e2038e1a82..eaf1f502705 100644
--- a/libstdc++-v3/libsupc++/new
+++ b/libstdc++-v3/libsupc++/new
@@ -46,6 +46,9 @@ 
 #define __glibcxx_want_constexpr_new
 #include <bits/version.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++11-extensions" // scoped enum
+
 #pragma GCC visibility push(default)
 
 extern "C++" {
@@ -245,5 +248,6 @@  namespace std
 #endif // C++20
 
 #pragma GCC visibility pop
+#pragma GCC diagnostic pop
 
 #endif