linux-kernel - Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build

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Date:   Tue, 25 Jun 2019 11:16:56 -0400
From:   Qian Cai <cai@....pw>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        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>,
        natechancellor@...il.com, ndesaulniers@...gle.com
Subject: Re: "arm64: vdso: Substitute gettimeofday() with C implementation"
 breaks clang build

On Tue, 2019-06-25 at 15:54 +0100, Vincenzo Frascino wrote:
> Hi Qian,
> 
> ...
> 
> > 
> > but clang 7.0 is still use in many distros by default, so maybe this commit
> > can
> > be fixed by adding a conditional check to use "small" if clang version <
> > 8.0.
> > 
> 
> Could you please verify that the patch below works for you?
> 
> Thanks,
> Vincenzo
> 
> --->8----
> 

It does not work unfortunately.

# make CC=clang -j 256 2>/tmp/warn3.txt
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/dtc/flattree.o
  HOSTCC  scripts/dtc/fstree.o
  HOSTCC  scripts/dtc/data.o
  HOSTCC  scripts/dtc/livetree.o
  HOSTCC  scripts/dtc/treesource.o
  HOSTCC  scripts/dtc/srcpos.o
  HOSTCC  scripts/dtc/checks.o
  HOSTCC  scripts/dtc/util.o
  LEX     scripts/dtc/dtc-lexer.lex.c
  YACC    scripts/dtc/dtc-parser.tab.h
  YACC    scripts/dtc/dtc-parser.tab.c
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  HOSTLD  scripts/dtc/dtc
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/recordmcount
  HOSTCC  scripts/sortextable
  DTC     arch/arm64/boot/dts/arm/foundation-v8.dtb
  DTC     arch/arm64/boot/dts/arm/foundation-v8-psci.dtb
  DTC     arch/arm64/boot/dts/arm/foundation-v8-gicv3.dtb
  DTC     arch/arm64/boot/dts/arm/foundation-v8-gicv3-psci.dtb
  DTC     arch/arm64/boot/dts/arm/juno.dtb
  DTC     arch/arm64/boot/dts/arm/juno-r1.dtb
  DTC     arch/arm64/boot/dts/arm/juno-r2.dtb
  DTC     arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dtb
  DTC     arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dtb
  DTC     arch/arm64/boot/dts/arm/fvp-base-revc.dtb
  DTC     arch/arm64/boot/dts/cavium/thunder2-99xx.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hi3670-hikey970.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hi3798cv200-poplar.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hip05-d02.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hip06-d03.dtb
  DTC     arch/arm64/boot/dts/hisilicon/hip07-d05.dtb
  HOSTCC  scripts/mod/mk_elfconfig
  CC      scripts/mod/devicetable-offsets.s
  CC      scripts/mod/empty.o
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  CC      kernel/bounds.s
  CALL    scripts/atomic/check-atomics.sh
  CC      arch/arm64/kernel/asm-offsets.s
  CALL    scripts/checksyscalls.sh
  LDS     arch/arm64/kernel/vdso/vdso.lds
  AS      arch/arm64/kernel/vdso/note.o
  AS      arch/arm64/kernel/vdso/sigreturn.o
  CC      arch/arm64/kernel/vdso/vgettimeofday.o
  LD      arch/arm64/kernel/vdso/vdso.so.dbg
  VDSOCHK arch/arm64/kernel/vdso/vdso.so.dbg
00000000000009d0 R_AARCH64_JUMP_SLOT  _mcount

arch/arm64/kernel/vdso/vdso.so.dbg: dynamic relocations are not supported
make[1]: *** [arch/arm64/kernel/vdso/Makefile:59:
arch/arm64/kernel/vdso/vdso.so.dbg] Error 1
make: *** [arch/arm64/Makefile:180: vdso_prepare] Error 2