Added ghdl option for setting IEEE library standard.

[wasv]

Adds a common option to the syntax checker for VHDL, to specify which IEEE standard library to use. A typcial value is "--ieee=synopsys". I'm not sure if I should set that as the default, or leave it nil.

[CLAassistant]

All committers have signed the CLA.

[wasv]

It looks like the CI is failing because I'm missing some documentation. How do I correct this?

[wasv]

I corrected the documentation issue, however during the integration tests, it looks like the ghdl binary is missing in the builder image.

[fmdkdd]

I'm not sure if I should set that as the default, or leave it nil.

Depends on how common it is to use it. The default should be helpful, but not annoying. I don't use GHDL so I'll let you decide. Leave it nil is fine.

it looks like the ghdl binary is missing in the builder image.

Yep, I ran out of steam when I first built the image. Help is always welcome though ;)

[wasv]

I might add ghdl to the builder image in another PR whenever I have the time. What would I need to edit to make this change?

[fmdkdd]

What would I need to edit to make this change?

See https://github.com/flycheck/docker-tools#how-to-add-a-tool

[fmdkdd]

LGTM, one minor change.

Could you add a line documenting this option to CHANGES.rst as well?

[fmdkdd]

The CI is failing due to unrelated Go changes. I'll fix that on master; you'll need to rebase once that is done.

[wasv]

Rebased onto master and added those changes. Should I squash all these commits into one?

[fmdkdd]

@wastevensv Yes please, do squash the commits.

[cpitclaudel]

👍 🎉

[fmdkdd]

Thanks @wastevensv !