On Thu, 2016-02-11 at 09:42 +0100, Torsten Duwe wrote:
> On Thu, Feb 11, 2016 at 06:48:17PM +1100, Balbir Singh wrote:
> > On Wed, 2016-02-10 at 17:25 +0100, Torsten Duwe wrote:
> > > +
> > > +echo "int func() { return 0; }" | \
> > > + $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> > > + sed -n -e '/func:/,/bl _mcount/p' | grep -q TOC
> > > +
> > > +leaf_toc_result=$?
> > > +
> >
> > leaf_toc_result failed for me with gcc 5. I'll try and grab gcc-6
> > and give the patches a spin
>
> Don't bother. _All_ gccs are broken in that respect currently.
> AFAIK Anton is working on this. You have to fake the test, like
> static int a; return a++;
>
> Gcc fails to set the TOC for profiled "leaf" functions, where it
> thinks no global/static symbols are referenced.
>
>
Thanks for the quick answer
BTW, do we expect static/non global functions to be called from
patched contexts? I understand that not supporting it will
complicate a patch.
Balbir Singh
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