linux-kernel - Re: [PATCH 4.4 22/38] elfcore: fix building with clang

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Date:   Tue, 9 Feb 2021 13:52:52 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Barret Rhoden <brho@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.4 22/38] elfcore: fix building with clang

Hi!

> From: Arnd Bergmann <arnd@...db.de>
> 
> commit 6e7b64b9dd6d96537d816ea07ec26b7dedd397b9 upstream.
> 
> kernel/elfcore.c only contains weak symbols, which triggers a bug with
> clang in combination with recordmcount:
> 
>   Cannot find symbol for section 2: .text.
>   kernel/elfcore.o: failed
> 
> Move the empty stubs into linux/elfcore.h as inline functions.  As only
> two architectures use these, just use the architecture specific Kconfig
> symbols to key off the declaration.

4.4 has this:

config BINFMT_ELF32
        bool
        default y if MIPS32_O32 || MIPS32_N32
                select ELFCORE

in arch/mips. So I believe we'll see problems in that
configuration...?

Best regards,
							Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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