linux-kernel - Re: [PATCH v2] Makefile.llvm: simplify LLVM build

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Message-ID: <CAK7LNAQxN=y=E_wysYhvDZh9hVpe5Yo6R0kVjCP7ZpK7+C_Vxw@mail.gmail.com>
Date:   Fri, 3 Apr 2020 01:54:12 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Fangrui Song <maskray@...gle.com>
Cc:     "'Nick Desaulniers' via Clang Built Linux" 
        <clang-built-linux@...glegroups.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sandeep Patil <sspatil@...gle.com>
Subject: Re: [PATCH v2] Makefile.llvm: simplify LLVM build

On Fri, Apr 3, 2020 at 1:40 AM Fangrui Song <maskray@...gle.com> wrote:
>
>
> On 2020-04-01, 'Nick Desaulniers' via Clang Built Linux wrote:
> >On Tue, Mar 31, 2020 at 11:11 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >>
> >> On Wed, Apr 1, 2020 at 3:39 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> >> >
> >> > On Mon, Mar 30, 2020 at 11:25 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
> >> > >
> >> > > Having both LLVM_DIR and LLVM_SUFFIX seems verbose.
> >> >
> >> > I agree, so maybe just LLVM=y, and we can support both non-standard
> >> > locations and debian suffixes via modifications to PATH.
> >>
> >>
> >>
> >> OK, so we will start with the boolean switch 'LLVM'.
> >>
> >> People can use PATH to cope with directory path and suffixes.
> >
> >Sounds good, we will modify our CI to use PATH modifications rather
> >than suffixes. We can even do that before such a patch to Makefile
> >exists.
>
> The proposed LLVM=1 + PATH scheme looks good to me.
>
>
> There seems to be one issue.
> OBJSIZE=llvm-objsize added in
> commit fcf1b6a35c16ac500fa908a4022238e5d666eabf "Documentation/llvm: add documentation on building w/ Clang/LLVM"
> is wrong.
>
> The tool is named llvm-size. OBJSIZE is only used once:
>
>    arch/s390/scripts/Makefile.chkbss
>    14:     if ! $(OBJSIZE) --common $< | $(AWK) 'END { if ($$3) exit 1 }'; then \


Good catch.

Could you send a patch, please?




-- 
Best Regards
Masahiro Yamada