linux-kernel - Re: [BUG] arm64: Build error with gcc 6

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Date:   Sun, 25 Feb 2018 07:14:44 +0200
From:   Baruch Siach <baruch@...s.co.il>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [BUG] arm64: Build error with gcc 6

Hi Masami Hiramatsu,

On Sun, Feb 25, 2018 at 11:50:37AM +0900, Masami Hiramatsu wrote:
> commit e1a50de37860 ("arm64: cputype: Silence Sparse warnings")
> introduces "UL" suffix to a hex number, but it causes a build error with gcc-6 series.
> I've hit below error with 6.2.1 and 6.4.1. Of course this is resolved by the latest
> stable gcc-7.2.1. But from the compatibility point of view, should we revert it?
> 
>   AS      arch/arm64/kernel/head.o
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S: Assembler messages:
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: found 'L', expected: ')'
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: junk at end of line, first unrecognized character is `L'
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: unexpected characters following instruction at operand 2 -- `movz x1,:abs_g1_s:0xff00ffffffUL'
> /home/mhiramat/ksrc/linux/arch/arm64/kernel/head.S:677: Error: unexpected characters following instruction at operand 2 -- `movk x1,:abs_g0_nc:0xff00ffffffUL'
> make[2]: *** [/home/mhiramat/ksrc/linux/scripts/Makefile.build:425: arch/arm64/kernel/head.o] error 1
> 
> I've checked with below 2 latest gccs.
> 
> http://releases.linaro.org/components/toolchain/binaries/latest-6/aarch64-linux-gnu/gcc-linaro-6.4.1-2017.11-x86_64_aarch64-linux-gnu.tar.xz
> 
> http://releases.linaro.org/components/toolchain/binaries/latest-7/aarch64-linux-gnu/gcc-linaro-7.2.1-2017.11-x86_64_aarch64-linux-gnu.tar.xz

The fix is pending:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?h=fixes/core&id=04c4927359b1f09310bfee92e7187c9022be3e00

This is in Linus' tree now, so should be in -rc3.

baruch

-- 
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