Re: [PATCH v8 4/8] ppc64 ftrace_with_regs configuration variables

[Torsten Duwe]

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; }" | \
> > +ÂÂÂÂ$* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \
> > +ÂÂÂÂsed -n -e '/func:/,/bl _mcount/p' | grep -q TOC
> > +
> > +leaf_toc_result=$?
> > +
> 
> 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.

	Torsten