Revisit libffi implementation for ARC #640
Description
Upstream libffi code for ARC Classic contains several issues which lead to warnings and errors. I have created a PR (libffi/libffi#844) to fix them in upstream. At the same time, patched must be pushed to Buildroot too as .patch files for libffi package. Also, I found that HS6x targets do not pass libffi DejaGNU tests related to floating point numbers.
Here is a roadmap of revisiting libffi:
- A series of fixes for ARC port libffi/libffi#844
- Push patches to Buildroot.
- Find out a root cause of failing tests for HS6x.
- Fix an implementation for HS6x.