When did arc-elf last build?

[Joern Rennecke]

Quoting Joel Sherrill <joel.sherrill@oarcorp.com>:

> Hi,
>
> I got a random unsolicited email about arc-elf since
> I pop up in google a lot asking cross compiler questions.
> I decided to try to build it and as PR41747 indicates
> 4.3.4, 4.4.1, and the head all fail building libgcc2.c
> in the same way.  T
>
> I did a search for arc-elf in the test results mail
> list archives and found none.

The arc-elf port in mainline gcc is for the architecture used by the  
ARCtangent-A4 and older cores, which has been superseded by the  
ARCompact
architecture.  The first article that a Google search turned up  
suggests that this was in 2001:
http://www.design-reuse.com/news/632/arc-16-32-bit-instruction-architecture-memory-requirements-up-30-per-cent.html

See also PR target/39303 .