linux-kernel - Re: [PATCH v8 00/16] Add support for Clang LTO

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Message-ID: <20201208004659.GA587492@ubuntu-m3-large-x86>
Date:   Mon, 7 Dec 2020 17:46:59 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Will Deacon <will@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>, Jian Cai <jiancai@...gle.com>,
        Kristof Beyls <Kristof.Beyls@....com>
Subject: Re: [PATCH v8 00/16] Add support for Clang LTO

On Sun, Dec 06, 2020 at 12:09:31PM -0800, Sami Tolvanen wrote:
> Sure, looks good to me. However, I think we should also test for
> LLVM=1 to avoid possible further issues with mismatched toolchains
> instead of only checking for llvm-nm and llvm-ar.

It might still be worth testing for $(AR) and $(NM) because in theory, a
user could say 'make AR=ar LLVM=1'. Highly unlikely I suppose but worth
considering.

Cheers,
Nathan