Re: 4.9.208 regression in perf building

[Jiri Olsa <jolsa@redhat.com>]

On Sun, Jan 05, 2020 at 10:21:25AM -0800, Akemi Yagi wrote:
> Adding Arnaldo and Jiri to the CC list.
> 
> On Sun, Jan 5, 2020 at 9:01 AM Gordan Bobic <gordan@redsleeve.org> wrote:
> >
> > It looks like 4.9.208 introduces a build regression for perf:
> >
> > make -f /builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/build/Makefile.build
> > dir=. obj=perf
> 
> >  -c -o builtin-report.o builtin-report.c
> > builtin-report.c: In function ‘report__setup_sample_type’:
> > builtin-report.c:296:6: error: ‘dwarf_callchain_users’ undeclared
> > (first use in this function)
> >   if (dwarf_callchain_users) {
> >       ^
> > builtin-report.c:296:6: note: each undeclared identifier is reported
> > only once for each function it appears in
> > mv: cannot stat ‘./.builtin-report.o.tmp’: No such file or directory
> > make[3]: *** [builtin-report.o] Error 1
> > make[2]: *** [perf-in.o] Error 2
> > make[1]: *** [sub-make] Error 2
> > make: *** [all] Error 2
> >
> > 4,9.207 works fine.
> 
> The regression was caused by the following patch:
> 
> https://lore.kernel.org/lkml/20191021133834.25998-7-acme@kernel.org/
> 
> To fix this, 'dwarf_callchain_users' needs to be declared.

hum, I see it's declared in callchain.h which is included in builtin-report.c
also I can't see that same stuff like you have on line 296.. what sources are you on?

could you please check with latest Arnaldo's perf/core?
  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git

thanks,
jirka