linux-kernel - Re: [PATCHv2 1/9] perf tools: Add build id shell test

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Message-ID: <20201002192944.GH3999500@krava>
Date:   Fri, 2 Oct 2020 21:29:44 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCHv2 1/9] perf tools: Add build id shell test

On Fri, Oct 02, 2020 at 10:34:51AM -0700, Ian Rogers wrote:

SNIP

> > > +
> > >  LIBJVMTI = libperf-jvmti.so
> > >
> > >  ifndef NO_JVMTI
> > > @@ -756,6 +763,13 @@ $(OUTPUT)perf-read-vdsox32: perf-read-vdso.c util/find-map.c
> > >         $(QUIET_CC)$(CC) -mx32 $(filter -static,$(LDFLAGS)) -Wall -Werror -o $@ perf-read-vdso.c
> > >  endif
> > >
> > > +ifndef NO_BUILDID_EX
> > > +$(OUTPUT)buildid-ex-sha1:
> > > +       $(QUIET_LINK)echo 'int main(void) { return 0; }' | $(CC) -Wl,--build-id=sha1 -o $@ -x c -
> > > +$(OUTPUT)buildid-ex-md5:
> > > +       $(QUIET_LINK)echo 'int main(void) { return 0; }' | $(CC) -Wl,--build-id=md5 -o $@ -x c -
> > > +endif
> >
> > Can we just build them in the test shell script instead?

it would solve the build-directory/install-directory
lookup search.. but it'd need to do detect compiler
and depend on it as Ian said

do you have some other reason to compile it in test?

thanks,
jirka

> >
> > Thanks
> > Namhyung
> 
> That'd mean perf test having a dependency on a compiler :-/ That said
> there are some existing dependencies for BPF compilers.

> 
> Thanks,
> Ian

SNIP