Created attachment 9645 [details]
simple test destructor

A::~A() appears twice:

    (gdb) bt
    #0  A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    #1  0x0000000000400a96 in A::~A (this=0x602010, __in_chrg=<optimized out>)
        at main.cpp:12
    #2  0x00000000004009c0 in main () at main.cpp:18

Should be once.

See the attached code:

    class A
    {
    public:
        A() {}
        virtual ~A() 
        {
            cout << "~A()" << endl;
        }
    };
    
    int main()
    {
        A* p = new A;
        delete p;
        return 0;
    }
    
Breakpoint A::~A has 2 locations:

    (gdb) b A::~A
    Breakpoint 1 at 0x400a40: A::~A. (2 locations)

The full gdb session:

    g++ -g main.cpp
    [jinq@localhost test]$ gdb a.out
    GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
    Copyright (C) 2013 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
    and "show warranty" for details.
    This GDB was configured as "x86_64-redhat-linux-gnu".
    For bug reporting instructions, please see:
    <http://www.gnu.org/software/gdb/bugs/>...
    Reading symbols from /home/jinq/test/a.out...done.
    (gdb) b A::~A
    Breakpoint 1 at 0x400a40: A::~A. (2 locations)
    (gdb) run
    Starting program: /home/jinq/test/a.out
    
    Breakpoint 1, A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:12
    12          }
    Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.8.x86_64 libgcc-4.8.5-4.el7.x86_64 libstdc++-4.8.5-4.el7.x86_64
    (gdb) bt
    #0  A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:12
    #1  0x00000000004009c0 in main () at main.cpp:18
    (gdb) s
    
    Breakpoint 1, A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    10          {
    (gdb) bt
    #0  A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    #1  0x0000000000400a96 in A::~A (this=0x602010, __in_chrg=<optimized out>)
        at main.cpp:12
    #2  0x00000000004009c0 in main () at main.cpp:18
    (gdb) ^CQuit
    (gdb)
    
Twice if it is virtual destructor and is called by delete.

Also see: http://lists.qt-project.org/pipermail/interest/2015-November/019691.html