Update to dmd master 20180824

[ibuclaw]

Rather than pointing to stable, base our mirror on dmd/master.

There are four outstanding patches applied here waiting to be merged.
See: https://github.com/dlang/dmd/pulls?utf8=%E2%9C%93&q=is%3Aopen+is%3Apr+label%3AGDC

First of such weekly snapshot-style updates.

Needs changelog, and notably druntime and phobos are missing - but they could be added separately.

[ibuclaw]

/home/runner/GDC/gcc/d/dmd/cond.d:109:5: error: declaration expected, not 'do'

Host compiler too old. 😄

[ibuclaw]

I'm going to have to beat some dmd devs round the head and add gdc-7 onto their test system as well as gdc-8.

[wilzbach]

FYI: We already test building DMD with gdc-8 on SemaphoreCI.

[ibuclaw]

@wilzbach - yeah, that's too new for me. :-)

Do we have capacity to test two versions of each compiler?

[belka-ew]

Can we update this to 2.081.2?

[ibuclaw]

Can apply all changes to dmd/master over the last week.

[belka-ew]

It would be great. I could merge this then into gdc-8 again and I hope we are able to fix gdc-7 till then. And then we would have a stable release in gdc-7 and gdc-8 which could remain there for some time.

[ibuclaw]

Ah, I see what you mean. Actually could raise a new PR to sync dmd/stable first as that diff will be no more than a few dozen changes.

Assuming stable has been sync'd back to master in upstream, that should be fine.

[belka-ew]

Minor releases are in the stable branch, how I could mix it up :)
I think it is a good strategy to try: master follows gcc and dmd master; and gdc-7/gdc-8 branches follow upstream stable and are a base for new releases.

[ibuclaw]

Yeah, that's the direction I'd like to go in. It means that we'll have small weekly updates here. Then once every two months do a merge from master to release branches.

Minor frontend release updates get applied directly to the current gcc release branch.

[wilzbach]

Do we have capacity to test two versions of each compiler?

I think so: dlang/dmd#8565

If it gets too slow, we have to do the Buildkite migration a bit faster ;-)

[jpf91]

DRUNTIME_SOVERSION and PHOBOS_SOVERSION in libphobos/configure.ac need to be updated.

DRUNTIME_SOVERSION addressed in other PR

[ibuclaw]

Merged in dmd master branch in its current state as of writing.

@jpf91 - This includes the ClassKind fix.