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Date: Sat, 30 Jan 2021 15:12:31 -0500
From: Rich Felker <>
To: Jiahao XU <>
Cc: "" <>
Subject: Re: Can’t build musl with

On Fri, Jan 29, 2021 at 12:19:42PM +0000, Jiahao XU wrote:
> musl-1.2.2 compilation with clang-11 failed to build at the final linking stage:
>     ld.lld: error: undefined hidden symbol: __dls2
>     >>> referenced by ld-temp.o
>     >>>                          lto.tmp:(_dlstart_c)
>     >>> did you mean: __dls3
>     >>> defined in: lto.tmp
> I am using CFLAGS=‘-march=native -mtune=native -Oz -flto
> -fmerge-all-constants -fomit-frame-pointer’ and LDFLAGS=‘-flto

The -fmerge-all-constants option gives non-conforming language
semantics and should not be used, but that's a separate issue.

> -fuse-ld=lld -Wl,—plugin-opt=O3,-O3,—icf=safe’.

> No configure option is supplied.

Otherwise, it's a known issue that LTO misses references from asm
(both top-level and in functions). I think dlstart.lo and a few other
files should just be built with LTO disabled; any LTO-type
optimization in code that runs at this stage is inherently invalid,
anyway. So something like (in config.mak):

obj/ldso/dlstart.lo: CFLAGS_ALL += -fno-lto


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