[gcc r12-10273] libstdc++: Fix -Wsystem-headers warnings

[gcc r12-10273] libstdc++: Fix -Wsystem-headers warnings

[Jonathan Wakely]

https://gcc.gnu.org/g:2d174d4181896129d465cbf42dc454f4f906892b

commit r12-10273-g2d174d4181896129d465cbf42dc454f4f906892b
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/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.
    
    (cherry picked from commit 8f6d25f19bae521c3d028bcdcd69019540b8c3b9)

Diff:
---
 libstdc++-v3/include/bits/stl_tempbuf.h | 3 +++
 libstdc++-v3/include/ext/functional     | 4 ++--
 libstdc++-v3/include/std/spanstream     | 3 ++-
 libstdc++-v3/libsupc++/exception_ptr.h  | 2 +-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/include/bits/stl_tempbuf.h b/libstdc++-v3/include/bits/stl_tempbuf.h
index db7cdb14ca9..f8323d4ab71 100644
--- a/libstdc++-v3/include/bits/stl_tempbuf.h
+++ b/libstdc++-v3/include/bits/stl_tempbuf.h
@@ -254,6 +254,8 @@ _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)
@@ -278,6 +280,7 @@ _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 19cd8d5b563..11c2de1294b 100644
--- a/libstdc++-v3/include/ext/functional
+++ b/libstdc++-v3/include/ext/functional
@@ -394,8 +394,6 @@ _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.
@@ -420,6 +418,8 @@ _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/spanstream b/libstdc++-v3/include/std/spanstream
index 5855b286efe..8fd74b8f9cb 100644
--- a/libstdc++-v3/include/std/spanstream
+++ b/libstdc++-v3/include/std/spanstream
@@ -134,7 +134,8 @@ 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 6433f059e9c..07e456237db 100644
--- a/libstdc++-v3/libsupc++/exception_ptr.h
+++ b/libstdc++-v3/libsupc++/exception_ptr.h
@@ -271,7 +271,7 @@ namespace std
   // 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