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Re: vtable Emission inconsistency
- From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
- To: Miko Vich <alexmudmiko at gmail dot com>
- Cc: gcc-help <gcc-help at gcc dot gnu dot org>
- Date: Fri, 4 Sep 2015 16:24:28 +0100
- Subject: Re: vtable Emission inconsistency
- Authentication-results: sourceware.org; auth=none
- References: <CADepfxFgW=YVgybAU64rurvN5Y=bMXH3BZsUochYLRqPeQy9mw at mail dot gmail dot com>
On 3 September 2015 at 19:55, Miko Vich wrote:
> Hi,
>
> [Note: This is an extremely stripped down case to show the issue]
>
> The following class when compiled with g++ 4.9.2 emits the vtable for class Foo:
>
> class Foo
> {
>
> virtual void dosomething() { }
> virtual ~Foo() noexcept __attribute__((used)) { }
> };
>
> The following class when compiled does not emit the vtable:
>
> class Foo
> {
>
> virtual void dosomething() { }
> virtual ~Foo() noexcept __attribute__((used)) = default;
> };
>
>
> While this is a trivial problem to fix, it seems to me that the
> behaviour is inconsistent.
>
> Bug? Expected/undefined behaviour? Fixed in a later release?
This is a bug, present in all releases. Jason (the C++ front-end
maintainer) says:
"looks like a bug. specifically, we aren't handling attribute used
properly for the defaulted dtor"
I've created https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67453 --
thanks for letting us know about it.