[gcc r13-8804] libstdc++: Guard use of sized deallocation [PR114940]

[Jonathan Wakely]

https://gcc.gnu.org/g:67434fec24bef0faeec0eb402f82ca7e43a4a112

commit r13-8804-g67434fec24bef0faeec0eb402f82ca7e43a4a112
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 22 10:32:43 2024 +0100

    libstdc++: Guard use of sized deallocation [PR114940]
    
    Clang does not enable -fsized-deallocation by default, which means it
    can't compile our <stacktrace> header.
    
    Make the __cpp_lib_generator macro depend on the compiler-defined
    __cpp_sized_deallocation macro, and change <stacktrace> to use unsized
    deallocation when __cpp_sized_deallocation isn't defined.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/114940
            * include/std/stacktrace (_GLIBCXX_SIZED_DELETE): New macro.
            (basic_stacktrace::_Impl::_M_deallocate): Use it.
    
    (cherry picked from commit b2fdd508d7e63158e9d2a6dd04f901d02900def3)

Diff:
---
 libstdc++-v3/include/std/stacktrace | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/std/stacktrace b/libstdc++-v3/include/std/stacktrace
index 8f09467d751..3d8a085a6a9 100644
--- a/libstdc++-v3/include/std/stacktrace
+++ b/libstdc++-v3/include/std/stacktrace
@@ -600,6 +600,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #else
 # define _GLIBCXX_OPERATOR_NEW ::operator new
 # define _GLIBCXX_OPERATOR_DELETE ::operator delete
+#endif
+
+#if __cpp_sized_deallocation
+# define _GLIBCXX_SIZED_DELETE(T, p, n) \
+  _GLIBCXX_OPERATOR_DELETE((p), (n) * sizeof(T))
+#else
+# define _GLIBCXX_SIZED_DELETE(T, p, n) _GLIBCXX_OPERATOR_DELETE(p)
 #endif
 
 	// Precondition: _M_frames == nullptr && __n != 0
@@ -641,8 +648,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  if (_M_capacity)
 	    {
 	      if constexpr (is_same_v<allocator_type, allocator<value_type>>)
-		_GLIBCXX_OPERATOR_DELETE (static_cast<void*>(_M_frames),
-					  _M_capacity * sizeof(value_type));
+		_GLIBCXX_SIZED_DELETE(value_type,
+				      static_cast<void*>(_M_frames),
+				      _M_capacity);
 	      else
 		__alloc.deallocate(_M_frames, _M_capacity);
 	      _M_frames = nullptr;
@@ -650,6 +658,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	    }
 	}
 
+#undef _GLIBCXX_SIZED_DELETE
 #undef _GLIBCXX_OPERATOR_DELETE
 #undef _GLIBCXX_OPERATOR_NEW