https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63526

--- Comment #2 from Dávid Éles <eles.david.88 at gmail dot com> ---
(In reply to Jonathan Wakely from comment #1)
> Why do you think the member should be zero-initialized? Your constructor
> fails to initialize it.

I uses the default mechanism to initialization of members. 
As far as I know the C++ standard says (8.5/5):
To default-initialize an object of type T means:
* If T is a non-POD class type (clause 9), the default constructor for T is
called (and the initialization is ill-formed if T has no accessible default
constructor).
* If T is an array type, each element is default-initialized.
* Otherwise, the object is zero-initialized.

In case of c++ it should be zero initialized if it is the member of a
class/struct.

As far as I know I have to force to not doing zero initialization something
like that 
Foo* f = new Foo;

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