[gcc r13-3817] libstdc++: Fix -Wsystem-headers warnings

[Jonathan Wakely]

https://gcc.gnu.org/g:8f6d25f19bae521c3d028bcdcd69019540b8c3b9

commit r13-3817-g8f6d25f19bae521c3d028bcdcd69019540b8c3b9
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Sat Nov 5 12:35:55 2022 +0000

    libstdc++: Fix -Wsystem-headers warnings
    
    Fix some problems noticed with -Wsystem-headers.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/stl_tempbuf.h (_Temporary_buffer): Disable
            warnings about get_temporary_buffer being deprecated.
            * include/ext/functional (mem_fun1, mem_fun1_ref): Disable
            warnings about mem_fun1_t, const_mem_fun1_t, mem_fun1_ref_t and
            const_mem_fun1_ref_t being deprecated.
            * include/std/array (__array_traits<T, 0>): Remove artificial
            attributes which give warnings about being ignored.
            * include/std/spanstream (basic_spanbuf::setbuf): Add assertion
            and adjust to avoid narrowing warning.
            * libsupc++/exception_ptr.h [!__cpp_rtti && !__cpp_exceptions]
            (make_exception_ptr): Add missing inline specifier.

Diff:
---
 libstdc++-v3/include/bits/stl_tempbuf.h | 3 +++
 libstdc++-v3/include/ext/functional     | 4 ++--
 libstdc++-v3/include/std/array          | 4 ++--
 libstdc++-v3/include/std/spanstream     | 3 ++-
 libstdc++-v3/libsupc++/exception_ptr.h  | 2 +-
 5 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/include/bits/stl_tempbuf.h b/libstdc++-v3/include/bits/stl_tempbuf.h
index b13aa3b0fcc..f3d4dd73073 100644
--- a/libstdc++-v3/include/bits/stl_tempbuf.h
+++ b/libstdc++-v3/include/bits/stl_tempbuf.h
@@ -257,6 +257,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  __ucr(__first, __last, __seed);
     }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
   template<typename _ForwardIterator, typename _Tp>
     _Temporary_buffer<_ForwardIterator, _Tp>::
     _Temporary_buffer(_ForwardIterator __seed, size_type __original_len)
@@ -281,6 +283,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    }
 	}
     }
+#pragma GCC diagnostic pop
 
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
diff --git a/libstdc++-v3/include/ext/functional b/libstdc++-v3/include/ext/functional
index 9cf864d9290..a947ee6384d 100644
--- a/libstdc++-v3/include/ext/functional
+++ b/libstdc++-v3/include/ext/functional
@@ -396,8 +396,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { _M_initialize(161803398u); }
   };
 
-#pragma GCC diagnostic pop
-
   // Mem_fun adaptor helper functions mem_fun1 and mem_fun1_ref,
   // provided for backward compatibility, they are no longer part of
   // the C++ standard.
@@ -422,6 +420,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     mem_fun1_ref(_Ret (_Tp::*__f)(_Arg) const)
     { return std::const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
 
+#pragma GCC diagnostic pop
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
diff --git a/libstdc++-v3/include/std/array b/libstdc++-v3/include/std/array
index 7ba92d0e90d..e26390e6f80 100644
--- a/libstdc++-v3/include/std/array
+++ b/libstdc++-v3/include/std/array
@@ -64,11 +64,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
      struct _Type
      {
        // Indexing is undefined.
-       __attribute__((__always_inline__,__artificial__,__noreturn__))
+       __attribute__((__always_inline__,__noreturn__))
        _Tp& operator[](size_t) const noexcept { __builtin_trap(); }
 
        // Conversion to a pointer produces a null pointer.
-       __attribute__((__always_inline__,__artificial__))
+       __attribute__((__always_inline__))
        operator _Tp*() const noexcept { return nullptr; }
      };
 
diff --git a/libstdc++-v3/include/std/spanstream b/libstdc++-v3/include/std/spanstream
index 6abf013d41b..483996b274f 100644
--- a/libstdc++-v3/include/std/spanstream
+++ b/libstdc++-v3/include/std/spanstream
@@ -136,7 +136,8 @@ template<typename _CharT, typename _Traits>
     basic_streambuf<_CharT, _Traits>*
     setbuf(_CharT* __s, streamsize __n) override
     {
-      span({__s, __n});
+      __glibcxx_assert(__n >= 0);
+      this->span(std::span<_CharT>(__s, __n));
       return this;
     }
 
diff --git a/libstdc++-v3/libsupc++/exception_ptr.h b/libstdc++-v3/libsupc++/exception_ptr.h
index fd9ceec88d4..b0118102123 100644
--- a/libstdc++-v3/libsupc++/exception_ptr.h
+++ b/libstdc++-v3/libsupc++/exception_ptr.h
@@ -280,7 +280,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
   // instead of a working one compiled with RTTI and/or exceptions enabled.
   template<typename _Ex>
     __attribute__ ((__always_inline__))
-    exception_ptr
+    inline exception_ptr
     make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT
     { return exception_ptr(); }
 #endif