linux-kernel - Re: [Linux-v5.17-rc6] Building tools/perf with perl v5.34

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Date:   Mon, 7 Mar 2022 13:35:50 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Jiri Olsa <olsajiri@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Linux-v5.17-rc6] Building tools/perf with perl v5.34

Em Sun, Mar 06, 2022 at 05:00:22PM +0100, Sedat Dilek escreveu:
> On Sun, Mar 6, 2022 at 4:42 PM Jiri Olsa <olsajiri@...il.com> wrote:
> > I'm getting some other lto related error:
> >
> >         $ cat test-libperl.make.output
> >         clang-13: error: optimization flag '-ffat-lto-objects' is not supported [-Werror,-Wignored-optimization-argument]
> >
 
> I was thinking about syncing the flags for both feature test-perl and
> perf/libperl-support.
 
> tools/build/feature/Makefile
> tools/perf/Makefile.config
 
> So, I guess FLAGS_PERL_EMBED differs.
 
> For building perf '-ffat-lto-objects'  is filtered-out...
 
> $ git grep ffat-lto-objects tools/perf/
> tools/perf/Makefile.config:  PERL_EMBED_CCOPTS := $(filter-out
> -flto=auto -ffat-lto-objects, $(PERL_EMBED_CCOPTS))

Right, with the patch below I can build with clang 13. It would be nice
to have this defined into just one place, but for now, for 5.17 the
minimal fix is preferred, can you send a proper patch, s-o-b, etc?

- Arnaldo

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 1480910c792e2cb3..869073cf84493083 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -218,6 +218,7 @@ PERL_EMBED_LDOPTS = $(shell perl -MExtUtils::Embed -e ldopts 2>/dev/null)
 PERL_EMBED_LDFLAGS = $(call strip-libs,$(PERL_EMBED_LDOPTS))
 PERL_EMBED_LIBADD = $(call grep-libs,$(PERL_EMBED_LDOPTS))
 PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
+PERL_EMBED_CCOPTS := $(filter-out -ffat-lto-objects, $(PERL_EMBED_CCOPTS))
 FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)
 
 $(OUTPUT)test-libperl.bin: