linux-kernel - Re: [PATCH v7 2/2] Kbuild: implement support for DWARF v5

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Message-ID: <20210203233607.GI4020736@tucnak>
Date:   Thu, 4 Feb 2021 00:36:07 +0100
From:   Jakub Jelinek <jakub@...hat.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        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 v7 2/2] Kbuild: implement support for DWARF v5

On Thu, Feb 04, 2021 at 08:06:12AM +0900, Masahiro Yamada wrote:
> GCC never outputs '.file 0', which is why
> this test is only needed for Clang, correct?

No, GCC outputs .file 0 if it during configure time detected assembler that
supports it and doesn't have any of the known bugs related to it.
But that means kernel doesn't need to care because GCC already took care of
that.

	Jakub