linux-kernel - Re: [PATCH v6 2/2] Kbuild: implement support for DWARF v5

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Date:   Fri, 29 Jan 2021 14:31:01 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jakub Jelinek <jakub@...hat.com>,
        Fangrui Song <maskray@...gle.com>,
        Caroline Tice <cmtice@...gle.com>,
        Nick Clifton <nickc@...hat.com>, Yonghong Song <yhs@...com>,
        Jiri Olsa <jolsa@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>
Subject: Re: [PATCH v6 2/2] Kbuild: implement support for DWARF v5

On Fri, Jan 29, 2021 at 2:23 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> On Fri, Jan 29, 2021 at 11:21 PM Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:
> >
> > On Fri, Jan 29, 2021 at 2:11 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
> > >
> > > On Fri, Jan 29, 2021 at 11:09 PM Nick Desaulniers
> > > <ndesaulniers@...gle.com> wrote:
> > > >
> > > > On Fri, Jan 29, 2021 at 1:20 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
> > > > >
> > > > > On Fri, Jan 29, 2021 at 10:13 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
> > > > > >
> > > > > > On Fri, Jan 29, 2021 at 10:09 PM Nick Desaulniers
> > > > > > <ndesaulniers@...gle.com> wrote:
> > > > > > >
> > > > > > > Can you tell me please what is the precise command line invocation of
> > > > > > > make and which source file you observed this on so that I can
> > > > > > > reproduce?
> > > >
> > > > If you don't send me your invocation of `make`, I cannot help you.
> > > >
> > >
> > > /usr/bin/perf_5.10 stat make V=1 -j4 LLVM=1 LLVM_IAS=1
> > > PAHOLE=/opt/pahole/bin/pahole LOCALVERSION=-10-amd64-clang12
> > > -lto-pgo KBUILD_VERBOSE=1 KBUILD_BUILD_HOST=iniza
> > > KBUILD_BUILD_USER=sedat.dilek@...il.com
> > > KBUILD_BUILD_TIMESTAMP=2021-01-29 bindeb-pkg
> > > KDEB_PKGVERSION=5.11.0~rc5-10~bullseye+dileks1
> >
> > $ make LLVM=1 LLVM_IAS=1 -j72 defconfig
> > $ make LLVM=1 LLVM_IAS=1 -j72 menuconfig
> > <enable CONFIG_DEBUG_INFO and CONFIG_DEBUG_INFO_DWARF5>
> > $ make LLVM=1 LLVM_IAS=1 -j72 V=1 &> log.txt
> > $ grep '\-g -gdwarf-5 -g -gdwarf-5' log.txt | wc -l
> > 0
> > $ grep '\-g -gdwarf-5' log.txt | wc -l
> > 2517
> >
> > Do have the patch applied twice, perhaps?
> >
>
> Switched to my v6 local Git branch and invoked above make line I gave you.
> I still see that double.
> Looks like I need some "undrunken" switch.

Can you follow my steps precisely to see whether it's your .config?
Perhaps there is a config that duplicates DEBUG_CFLAGS that is not set
in the defconfig?  If so, it's still harmless to specify the same
commands twice, and likely isn't introduced by this patch set if so;
so I'm not sure how much more effort is worth pursuing.
-- 
Thanks,
~Nick Desaulniers