[Bug c++/42992] New: [C++0x] =default erases virtual declaration of a destructor.

[albrt2000 at gmail dot com]

Hello,

Following code :
#include <iostream>

struct A {
virtual ~A()=default;

};

struct B : public A {
virtual ~B() {
std::cout << "B destructor\n";
}

};

int main() {
B* b = new B;
A* pA = b;
delete pA;
return 0;
}
outputs nothing, B destructor is not called as if A destructor was not
considered as virtual.

However, following code works fine :
#include <iostream>

struct A {
virtual ~A();
};

A::~A()=default;

struct B : public A {
virtual ~B() {
std::cout << "B destructor\n";
}

};

int main() {
B* b = new B;
A* pA = b;
delete pA;
return 0;
}
It outputs "B destrucor".
Having to separate virtual declaration from default definition seems to be out
of spec.

Bug found with MinGW/gcc 4.4.1..
Compilation command :
mingw32-g++.exe -Wall -fexceptions  -Wmain -pedantic -W -g -std=c++0x -c
main.cpp -o obj\Debug\main.o
mingw32-g++.exe  -o bin\Debug\TestCpp.exe obj\Debug\main.o  

Best Regards
Albert.


-- 
           Summary: [C++0x] =default erases virtual declaration of a
                    destructor.
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: albrt2000 at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42992