linux-kernel - Re: [perf] Build error when using LTO on 6.4

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Message-ID: <ZMIG6J+zqSIGVlAq@debian.me>
Date:   Thu, 27 Jul 2023 12:55:52 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.g.garry@...cle.com>,
        Marcus Seyfarth <m.seyfarth@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Perf <linux-perf-users@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [perf] Build error when using LTO on 6.4

On Wed, Jul 26, 2023 at 09:20:33PM -0700, Ian Rogers wrote:
> On Wed, Jul 26, 2023 at 8:55 PM Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >
> > Hi,
> >
> > I notice a build regression on Bugzilla [1]. Quoting from it:
> >
> > > Starting with Kernel 6.4, I see a build error when using "-flto" to build perf. This used to work fine with earlier Kernels when using either bfd or mold as linker when using GCC 13.1.1.
> 
> Hmm.. strange I've never seen this work with GCC.
> 
> > >
> > > This is the PKGBUILD I use as my build recipe: https://github.com/ms178/archpkgbuilds/blob/main/packages/bpf/PKGBUILD
> 
> If this binary is for distribution BUILD_BPF_SKEL=1 should be set. We
> need to make this an opt-out rather than opt-in. The last time we did
> this there was some friction:
> https://lore.kernel.org/lkml/CAHk-=wjY_3cBELRSLMpqCt6Eb71Qei2agfKSNsrr5KcpdEQCaA@mail.gmail.com/

The reporter runs Arch Linux. PKGBUILD is a build script to create
packages, though. See the distro doc [1] for details.

[1]: https://wiki.archlinux.org/title/PKGBUILD

-- 
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