linux-kernel - Re: "arm64: Silence gcc warnings about arch ABI drift" breaks clang

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Message-ID: <20190607152517.GC19862@fuggles.cambridge.arm.com>
Date:   Fri, 7 Jun 2019 16:25:17 +0100
From:   Will Deacon <will.deacon@....com>
To:     Qian Cai <cai@....pw>
Cc:     Dave Martin <Dave.Martin@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org
Subject: Re: "arm64: Silence gcc warnings about arch ABI drift" breaks clang

On Fri, Jun 07, 2019 at 11:22:45AM -0400, Qian Cai wrote:
> The linux-next commit "arm64: Silence gcc warnings about arch ABI drift" [1]
> breaks clang build where it screams that unknown option "-Wno-psabi" and
> generates errors below,

So that can be easily fixed with cc-option...

> [1] https://lore.kernel.org/linux-arm-kernel/1559817223-32585-1-git-send-email-D
> ave.Martin@....com/
> 
> ./drivers/firmware/efi/libstub/arm-stub.stub.o: In function
> `install_memreserve_table':
> ./linux/drivers/firmware/efi/libstub/arm-stub.c:73: undefined reference to
> `__efistub___stack_chk_guard'
> ./linux/drivers/firmware/efi/libstub/arm-stub.c:73: undefined reference to
> `__efistub___stack_chk_guard'
> ./linux/drivers/firmware/efi/libstub/arm-stub.c:93: undefined reference to
> `__efistub___stack_chk_guard'
> ./linux/drivers/firmware/efi/libstub/arm-stub.c:93: undefined reference to
> `__efistub___stack_chk_guard'
> ./linux/drivers/firmware/efi/libstub/arm-stub.c:94: undefined reference to
> `__efistub___stack_chk_fail

... but this looks unrelated. Are you saying you don't see these errors if
you revert Dave's patch?

Will