linux-kernel - Re: [PATCH v2 0/7] set clang minimum version to 10.0.1

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Message-ID: <CA+icZUVWMXFJ1K1Mkfm9mnTAgoM4-avww=9BPn5msDNMvrvN+w@mail.gmail.com>
Date:   Tue, 1 Sep 2020 15:55:40 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] set clang minimum version to 10.0.1

On Tue, Sep 1, 2020 at 2:23 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> Adds a compile time #error to compiler-clang.h setting the effective
> minimum supported version to clang 10.0.1. A separate patch has already
> been picked up into the Documentation/ tree also confirming the version.
>
> Next are a series of reverts. One for 32b arm is a partial revert.
>
> Then Marco suggested fixes to KASAN docs.
>
> Finally, improve the warning for GCC too as per Kees.
>
> Patches after 001 are new for v2.
>
> Marco Elver (1):
>   kasan: Remove mentions of unsupported Clang versions
>
> Nick Desaulniers (6):
>   compiler-clang: add build check for clang 10.0.1
>   Revert "kbuild: disable clang's default use of -fmerge-all-constants"
>   Revert "arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support"
>   Revert "arm64: vdso: Fix compilation with clang older than 8"
>   Partial revert "ARM: 8905/1: Emit __gnu_mcount_nc when using Clang
>     10.0.0 or newer"
>   compiler-gcc: improve version warning
>

I have tested theses 7 patches together with v2 of "Documentation: add
minimum clang/llvm version".

- Sedat -

>  Documentation/dev-tools/kasan.rst | 4 ++--
>  Makefile                          | 9 ---------
>  arch/arm/Kconfig                  | 2 +-
>  arch/arm64/Kconfig                | 2 --
>  arch/arm64/kernel/vdso/Makefile   | 7 -------
>  include/linux/compiler-clang.h    | 8 ++++++++
>  include/linux/compiler-gcc.h      | 2 +-
>  lib/Kconfig.kasan                 | 9 ++++-----
>  8 files changed, 16 insertions(+), 27 deletions(-)
>
> --
> 2.28.0.402.g5ffc5be6b7-goog
>