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

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Date:   Fri, 07 Jun 2019 11:22:45 -0400
From:   Qian Cai <cai@....pw>
To:     Dave Martin <Dave.Martin@....com>
Cc:     Will Deacon <will.deacon@....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: "arm64: Silence gcc warnings about arch ABI drift" breaks clang

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,

[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