Re: [PATCH v3 2/2] Default to --with-default-link=no (bug 25812)

[Florian Weimer <fweimer@redhat.com>]

* Fangrui Song:

>>How does lld place sections without a linker script?  Purely based on
>>names?
>
> It entirely uses code to describe the built-in rules like gold, while
> GNU ld uses an internal linker script plus built-in code.
> (some rules cannot be described by the linker script language and needs
> code anyway).

How can we make sure that certain sections are covered by RELRO, and
still get start/stop symbols for them?

>>> Besides, the position of .hash in --with-default-link=no seems weird.
>>> 71213dc2589554dc8f8061e9b04e80c55d098b6a (2006-09) moved it to the end
>>> of the RO segment.
>>
>>I think it's odd that we have an old-style hash table at all.  Do we
>>really need it?  All tools should have migrated by now.
>
> We can remove .hash for non-mips architectures.

We need the support in glibc for most architectures in the dynamic
linker, but we don't have to build glibc with the legacy hash tables.

> (I am a bit sad .MIPS.xhash support went in, but thankfully it doesn't take
> too much code.  The translation table could be solved in a better way. I
> suspect the whole thing is unnecessary with RELR.)

Huh?  Aren't they unrelated?

Thanks,
Florian