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

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Message-ID: <CABCJKufgkq+k0DeYaXrzjXniy=T_N4sN1bxoK9=cUxTZN5xSVQ@mail.gmail.com>
Date:   Fri, 4 Dec 2020 14:52:41 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        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 Thu, Dec 3, 2020 at 2:32 PM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> So I'd recommend to Sami to simply make the Kconfig also depend on
> clang's integrated assembler (not just llvm-nm and llvm-ar).

Sure, sounds good to me. What's the preferred way to test for this in Kconfig?

It looks like actually trying to test if we have an LLVM assembler
(e.g. using $(as-instr,.section
".linker-options","e",@llvm_linker_options)) doesn't work as Kconfig
doesn't pass -no-integrated-as to clang here. I could do something
simple like $(success,echo $(LLVM) $(LLVM_IAS) | grep -q "1 1").

Thoughts?

Sami