[Bug 239682] Default to devel/llvm90 when libLLVM/libclang are required or if /usr/bin/clang is not enough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239682

--- Comment #31 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Brooks Davis from comment #28)
> You are correct that some bugs won't be found until LLVM_DEFAULT is bumped, but
> doing it without coordination with me (the PR does not count) and making the
> switch the I was unavailable to respond to the reports is unacceptable.

"(the PR does not count)" bit is offensive to me. In ports/ the primary way to
cooperate with each other is either via bugzilla. Other ways are too easily
lost in the noise. For one, portmgr@ encourages every ports/ contributor to
file a bug even for stuff submitted on phabricator.

Why are you ignoring the place where the coordination happens?

> I'm upset that users are getting a less than ideal experience due to
> your needless rush to bump the default and worse that we've
> inflicted it on the quarterly branch effectively untested.

Despite watching bugzilla, maillists, freebsd forums, reddit, twitter, gitter
everything looked fine. Now that Warner said Gnome (without giving more
details) I've searched again and have found the following:
https://forums.freebsd.org/threads/gnome-starts-in-black.72497/post-441133

If so (i.e., related) it implies only /quarterly users run Gnome, so the issue
wouldn't be found by extra waiting on /latest. The fix would be to pin mesa-dri
to llvm80. Would have to be done during LLVM_DEFAULT=100 bump, anyway.

(In reply to Warner Losh from comment #29)
> Finally, the exprun for FreeBSD base has kept it from upgrading to
> 9.0 because the fallout from this upgrade is too large. Let that
> sink in: we can't upgrade base because llvm 9.0 is too broken. And
> yet it got rushed in just before the quarterly branch. This is not
> sound engineering.

LLVM_DEFAULT bump is too small scale compared to base Clang upgrades. There are
only 43 consumers. I regularly touch ports with ~100 consumers, often without
filing any bugs. And I've helped fixing base Clang bustage as well.

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