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Date: Sun, 13 Nov 2022 08:46:46 +0800
From: Rui Ueyama <rui314@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: `musl-gcc -static` and lld/mold
Let me try to create a patch.
On Sun, Nov 13, 2022 at 8:38 AM Rich Felker <dalias@...c.org> wrote:
> On Sun, Nov 13, 2022 at 08:11:29AM +0800, Rui Ueyama wrote:
> > Hi,
> >
> > I think I found a musl-gcc issue. It looks like musl-gcc always appends
> > `-dynamic-linker /lib/ld-musl-x86_64.so.1` even if `-static` is given.
> That
> > causes a created program to immediately crash on startup as you can see
> > below:
> >
> > $ cat hello.c
> > #include <stdio.h>
> > int main() { printf("Hello\n"); }
> >
> > $ musl-gcc -static -fuse-ld=lld hello.c -o hello
> >
> > $ ./hello
> > Segmentation fault (core dumped)
> >
> > $ musl-gcc -static -fuse-ld=lld hello.c -o hello -Wl,-no-dynamic-linker
> > $ ./hello
> > Hello
> >
> > This also happens to my new linker, mold, as well. `-dynamic-linker`
> option
> > is passed to the linker, and lld and mold do what it is told to do, so I
> > don't think it is a linker's bug. Rather, it's a compiler front end's bug
> > that passes the unnecessary command line option. Can you not to append
> > `-dynamic-linker` if `-static`?
>
> Yes, I think this should be fixed. It only works with bfd ld without
> static pie (which we're also missing support for) because it just
> ignores -dynamic-linker in the ET_EXEC case.
>
> Would you be willing to propose a candidate patch? I believe this has
> been raised before in the context of static pie not working with
> musl-gcc (it didn't exist when the wrapper was added) so ideally that
> will get fixed too.
>
> Rich
>
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