[patch] Fix LD_PRELOAD=/usr/lib64/libasan.so.6 gdb

[Jan Kratochvil <jan.kratochvil@redhat.com>]

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Hi,

AddressSanitizer: alloc-dealloc-mismatch (malloc vs operator delete) on 0x613000000040
https://bugzilla.redhat.com/show_bug.cgi?id=1510413

The gdb binary had so far on Fedora 34 x86_64:

                 U operator delete[](void*)
                 U operator delete[](void*, unsigned long)
                 U operator delete(void*, unsigned long)

While now there are defined all these - but IMO it is a bit unpredictable
which will be used in the future:

00000000000000c0 T operator delete[](void*)
00000000000000d0 T operator delete[](void*, std::nothrow_t const&)
00000000000000e0 T operator delete[](void*, unsigned long)
0000000000000090 T operator delete(void*)
00000000000000a0 T operator delete(void*, std::nothrow_t const&)
00000000000000b0 T operator delete(void*, unsigned long)


Jan

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gdbsupport/
2021-05-02  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* new-op.cc (opertor delete 6x): New.

diff --git a/gdbsupport/new-op.cc b/gdbsupport/new-op.cc
index 5ab19621a43..f70d3ef191d 100644
--- a/gdbsupport/new-op.cc
+++ b/gdbsupport/new-op.cc
@@ -92,4 +92,44 @@ operator new[] (std::size_t sz, const std::nothrow_t&) noexcept
 {
   return ::operator new (sz, std::nothrow);
 }
+
+/* Define also operators delete as one can LD_PRELOAD=libasan.so.*
+   without recompiling the program with -fsanitize=address . */
+
+void
+operator delete (void *p)
+{
+  free (p);
+}
+
+void
+operator delete (void *p, const std::nothrow_t&) noexcept
+{
+  return ::operator delete (p);
+}
+
+void
+operator delete (void *p, std::size_t) noexcept
+{
+  return ::operator delete (p, std::nothrow);
+}
+
+void
+operator delete[] (void *p)
+{
+  return ::operator delete (p);
+}
+
+void
+operator delete[] (void *p, const std::nothrow_t&) noexcept
+{
+  return ::operator delete (p, std::nothrow);
+}
+
+void
+operator delete[] (void *p, std::size_t) noexcept
+{
+  return ::operator delete[] (p, std::nothrow);
+}
+
 #endif