linux-kernel - Re: [PATCH v2 1/7] compiler-clang: add build check for clang 10.0.1

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Date:   Tue, 1 Sep 2020 15:51:52 +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 1/7] compiler-clang: add build check for clang 10.0.1

On Tue, Sep 1, 2020 at 2:23 AM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> During Plumbers 2020, we voted to just support the latest release of
> Clang for now.  Add a compile time check for this.
>
> We plan to remove workarounds for older versions now, which will break
> in subtle and not so subtle ways.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/9
> Link: https://github.com/ClangBuiltLinux/linux/issues/941
> Suggested-by: Sedat Dilek <sedat.dilek@...il.com>
> Suggested-by: Nathan Chancellor <natechancellor@...il.com>
> Suggested-by: Kees Cook <keescook@...omium.org>
> Acked-by: Marco Elver <elver@...gle.com>
> Acked-by: Nathan Chancellor <natechancellor@...il.com>
> Acked-by: Sedat Dilek <sedat.dilek@...il.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Sedat Dilek <sedat.dilek@...il.com>
Tested-by: Sedat Dilek <sedat.dilek@...il.com>

- Sedat -

> ---
> Changes V1 -> V2:
> * use a more informational error, as per Kees.
> * collect tags.
>
>  include/linux/compiler-clang.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
> index cee0c728d39a..230604e7f057 100644
> --- a/include/linux/compiler-clang.h
> +++ b/include/linux/compiler-clang.h
> @@ -3,6 +3,14 @@
>  #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
>  #endif
>
> +#define CLANG_VERSION (__clang_major__ * 10000 \
> +                    + __clang_minor__ * 100    \
> +                    + __clang_patchlevel__)
> +
> +#if CLANG_VERSION < 100001
> +# error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
> +#endif
> +
>  /* Compiler specific definitions for Clang compiler */
>
>  /* same as gcc, this was present in clang-2.6 so we can assume it works
> --
> 2.28.0.402.g5ffc5be6b7-goog
>