From: Nathan Chancellor <natechancellor@gmail.com>
To: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>,
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Marco Elver <elver@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Masahiro Yamada <masahiroy@kernel.org>,
clang-built-linux@googlegroups.com,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Will Deacon <will@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/7] compiler-clang: add build check for clang 10.0.1
Date: Mon, 2 Nov 2020 23:38:14 -0700 [thread overview]
Message-ID: <20201103063814.GA647990@ubuntu-m3-large-x86> (raw)
In-Reply-To: <20201103045521.GA58906@kernel.org>
On Tue, Nov 03, 2020 at 06:55:21AM +0200, Jarkko Sakkinen wrote:
> On Wed, Sep 02, 2020 at 03:59:05PM -0700, Nick Desaulniers 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.
> >
> > Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
> > Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> > Suggested-by: Kees Cook <keescook@chromium.org>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
> > Reviewed-by: Kees Cook <keescook@chromium.org>
> > Reviewed-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
> > Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
> > Acked-by: Marco Elver <elver@google.com>
> > Acked-by: Nathan Chancellor <natechancellor@gmail.com>
> > Acked-by: Sedat Dilek <sedat.dilek@gmail.com>
> > Link: https://github.com/ClangBuiltLinux/linux/issues/9
> > Link: https://github.com/ClangBuiltLinux/linux/issues/941
> > ---
> > 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
>
>
> I'm trying to compile a BPF enabled test kernel for a live system and I
> get this error even though I have much newer clang:
>
> ➜ ~ (master) ✔ clang --version
> Ubuntu clang version 11.0.0-2
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> InstalledDir: /usr/bin
>
> Tried to Google for troubleshooter tips but this patch is basically the
> only hit I get :-)
Do you have a .config and command to reproduce the error?
Cheers,
Nathan
next prev parent reply other threads:[~2020-11-03 6:38 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 22:59 [PATCH v3 0/7] set clang minimum version to 10.0.1 Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 1/7] compiler-clang: add build check for clang 10.0.1 Nick Desaulniers
2020-11-03 4:55 ` Jarkko Sakkinen
2020-11-03 6:38 ` Nathan Chancellor [this message]
2020-11-03 9:00 ` Jarkko Sakkinen
2020-11-03 18:48 ` Nick Desaulniers
2020-11-04 0:38 ` Jarkko Sakkinen
2020-11-04 1:18 ` Nick Desaulniers
2020-11-04 1:34 ` Jarkko Sakkinen
2020-11-04 1:36 ` Jarkko Sakkinen
2020-11-17 3:04 ` John Hubbard
2020-11-17 18:46 ` Nick Desaulniers
2020-11-18 2:31 ` Nathan Chancellor
2020-11-18 2:37 ` Andrew Morton
2020-09-02 22:59 ` [PATCH v3 2/7] Revert "kbuild: disable clang's default use of -fmerge-all-constants" Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 3/7] Revert "arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support" Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 4/7] Revert "arm64: vdso: Fix compilation with clang older than 8" Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 5/7] Partially revert "ARM: 8905/1: Emit __gnu_mcount_nc when using Clang 10.0.0 or newer" Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 6/7] kasan: Remove mentions of unsupported Clang versions Nick Desaulniers
2020-09-02 22:59 ` [PATCH v3 7/7] compiler-gcc: improve version error Nick Desaulniers
2020-09-07 21:25 ` Will Deacon
2020-09-03 14:06 ` [PATCH v3 0/7] set clang minimum version to 10.0.1 Sedat Dilek
2020-09-03 17:28 ` Nathan Chancellor
2020-09-04 5:42 ` Miguel Ojeda
2020-09-07 16:12 ` Arvind Sankar
2020-09-08 4:42 ` Nathan Chancellor
2020-09-07 21:26 ` Will Deacon
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