demangling of @plt entries

demangling of @plt entries

[Milian Wolff]

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Hey all,

both perf and c++filt seem to have a problem with demangling @plt symbols:

c++filt _ZNK12QMapNodeBase8nextNodeEv@plt
_ZNK12QMapNodeBase8nextNodeEv@plt

c++filt _ZNK12QMapNodeBase8nextNodeEv
QMapNodeBase::nextNode() const

My question is: Should perf prevent this? I have a patch locally to just 
demangle symbols up to the @plt at the end, i.e. ignoring it. This fixes the 
problem for me.

But I'm not so sure - sounds like this is something that would be better fixed 
globally. I found https://sourceware.org/bugzilla/show_bug.cgi?id=12021 but 
that says it should be fixed already. Can anyone else reproduce this? Where 
should this be fixed, can anyone point me to a software repository?

c++filt --version
GNU c++filt (GNU Binutils) 2.25.1

perf from current acme/perf/core

Thanks
-- 
Milian Wolff | milian.wolff@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts

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Re: demangling of @plt entries

[Andi Kleen]

Milian Wolff <milian.wolff@kdab.com> writes:
>
> c++filt --version
> GNU c++filt (GNU Binutils) 2.25.1

I had a similar patch before, but it seems the problem disappears when
binutils (or rather libiberty) is updated.

-Andi

Re: demangling of @plt entries

[Milian Wolff]

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On Sonntag, 4. Oktober 2015 09:03:16 CEST Andi Kleen wrote:
> Milian Wolff <milian.wolff@kdab.com> writes:
> > c++filt --version
> > GNU c++filt (GNU Binutils) 2.25.1
> 
> I had a similar patch before, but it seems the problem disappears when
> binutils (or rather libiberty) is updated.

Are you running a self-compiled binutils from git? To my knowledge, 2.25.1 is 
the latest stable release.

But thanks, that at least tells me that I can wait and keep my patch local 
until a new binutils is released.

Bye
-- 
Milian Wolff | milian.wolff@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts

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