RFR: JDK-8217723 Switch ld from bfd to gold on gcc toolchain

[Andrew Haley]

On 1/25/19 3:39 PM, Andrew Haley wrote:
> On 1/25/19 2:39 PM, Andrew Haley wrote:
>> Massive win for gold here, on my (very old) AArch64 system:
> 
> And on another, faster AArch64 system:
> 
> BFD linker:
> 
> real	0m14.532s
> user	0m13.070s
> sys	0m1.419s
> 
> gold, single-threaded:
> 
> real	0m6.313s
> user	0m6.123s
> sys	0m0.190s
> 
> gold, multi-threaded:
> 
> real	0m4.129s
> user	0m8.724s
> sys	0m1.741s
> 
> Verdict: yes, please!
I couldn't get lld to work with any of the tools I have installed. So I built
a bleeding-edge gcc and lld, and I got:

lld, single-threaded

real	0m3.269s
user	0m3.049s
sys	0m0.221s

lld, multi-threaded:

real	0m1.213s
user	0m4.336s
sys	0m0.960s

Which is faster by a factor of 12! It'll be a while before this is installed
everywhere, but worth having. Effectively it makes linking go away as a major
component of build time.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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