Quoting Joel Sherrill <joel.sherr...@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The arc-elf port in mainline gcc is for the architecture used by the ARCtangent-A4 and older cores, which has been superseded by the ARCompact architecture.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 .

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