[Bug ld/29259] ld -r may create reloc sections with unordered relocs again

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29259

Nick Clifton <nickc at redhat dot com> changed:

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                 CC|                            |nickc at redhat dot com

--- Comment #4 from Nick Clifton <nickc at redhat dot com> ---
(In reply to Ajay Kaher from comment #3)
> Initially we observed ~10% degradation to compiling Linux Kernel 

I assume that you are talking about the time-taken-to-compile-the-kernel as
opposed to the performance-speed-of-the-compiled-and-linked-kernel ?

> with
> gcc-12.x as compare to gcc-10.x. During investigation we found ~5% is
> because of binutils and with git bisect end up with following commit:
> 
> https://github.com/bminor/binutils-gdb/commit/
> fba1ac87dcb76e61f270d236f1e7c8aaec80f9c4 
> 
> Could this problem be fixed (in some other way) without any degradation?

I think that the short answer is "no" since this is an area of the code where a
lot of care has to be taken to get things in the right order.  The answer could
be "yes", but I suspect that would involve a complete rewrite of a lot of the
linker, something that is bound to cause a lot more problems.

Sorry but I think that in this case you are going to have choose between a
slower but better able to handle special cases linker (2.39 or later) and a
faster but breaks under certain circumstances linker (2.38 or earlier).

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