Re: [PATCH -next] arm32: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION

[Arnd Bergmann]

On Thu, Feb 22, 2024, at 12:24, liuyuntao (F) wrote:
>
> The position of the caret has been moved below the right brace
> of { KEEP(*(.vectors.bhb.loop8)) }, indicating that lld is treating
> the entire `KEEP(*(.vectors))` as a file name. This could potentially be 
> a bug in lld. Perhaps we can temporarily
> enable the DCE option only when option LD_IS_LLD is disabled,
> like risc-v:
>
> `select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD`.

I would really like to see this working with lld if at all
possible, as it allows the combination of gc-sections with
lto and CONFIG_TRIM_UNUSED_KSYMS.

I experimented with lld myself now and I did get a booting
kernel even without the the KEEP() on the vectors. I also
see that this is the only use of OVERLAY in the kernel, so
I hope that we can find a way to make it work with existing
lld after all, either without the KEEP or without the OVERLAY.

Did you see any problems without the KEEP() on the vectors?

     Arnd