Re: [PATCH 1/6] perf tools: Add -lutil in python lib list for broken python-config

[Jiri Olsa]

On Mon, Jan 11, 2016 at 05:50:21PM +0800, Wangnan (F) wrote:

SNIP

> >
> >    Using this option has a significant performance cost. It is best to
> >use it only when there are unavoidable circular references between two or
> >more archives.
> ></quote>
> >
> >Without --start/end-group, if we provide -l in this order:
> >
> > ... -la -lb -lc ...
> >
> >and libb.a requires a symbol in liba.a, link would fail. The simplest way
> >to avoid this is to add another -la after -lb:
> >
> > ... -la -lb -la -lc ...
> >
> >In my environment it works as if we don't provide -Wl,--start-group and
> >-Wl,--end-group.
> >I don't know why.
> >
> 
> I mean the python case before I add -lutil after python libs.
> -Wl,--start-group and -Wl,--end-group
> seems not work for me. They are issued, I confirm this in strace output.

ok, got it.. I'm ok with the patch, there's no harm with extra lib,
however I think you should report this to gcc folks

also please resubmit the patch with the above comment,
to make it clear why it's there

thanks,
jirka