Add NVC simulator support

[kraigher]

I am in progress of adding support for the NVC simulator. There are still some bugs and features to be fixed be before we can add support for it but the author is very cooperative and is making great progress.

[kraigher]

I have pushed the work in progress to the nvc branch. The currently blocking bug is nickg/nvc#185 which is triggered by test_runner_cleanup. Otherwise it is able to compile and run the user_guide example up until test_runner_cleanup.

[peteut]

I just grepped the nvc branch but couldn't find any reference to nvc. Is there any progress on this?

[kraigher]

@peteut nvc support has not been quite finished yet but the basic user guide example works. There are still some problems to be solved like that it does not like some of our custom resolved types in the VHDL runner but @LarsAsplund might refactor those away. It is in a usable state though unless you use special stuff like test_runner_watchdog which will require the custom resolved type.

[peteut]

Great, I'm testing my VHDL backend for Migen currently and aiming for unit test support, vunit looks like the perfect fit. I'm not going to use test_runner_watchdog anyway and wrote a basic SimulatorInterface for nvc for now.

[kraigher]

@peteut There is already a simulator interface for nvc on the nvc branch.

[peteut]

@kraigher: got it, thanks! I somehow created a local branch, instead of checking out your nvc branch. Sorry for the confusion.

[nickg]

@kraigher what issues are stopping this working now? I have some free time to work on nvc at the moment so could look into any problems you run into...

[kraigher]

@nickg I will check with your latest fixes after I rebase the NVC branch. At least this issue is still a blocker nickg/nvc#202 if we do not work arround it in VUnit itself.

[nickg]

@kraigher nickg/nvc#202 is fixed now but I only tested it it a few simple cases so it may still have bugs

[kraigher]

@nickg I rebased nvc branch on vunit3 and found various problems. I will create reprocers for them. Some assets failed and some unresolved symbol.

[LarsAsplund]

Closed by #904