[MacPorts] #62927: Prefer MacPorts clang-11 and clang-10 over clang-9.0

[MacPorts]

#62927: Prefer MacPorts clang-11 and clang-10 over clang-9.0
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.6.4
Resolution:               |   Keywords:
      Port:               |
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Comment (by kencu):

 If you choose a clang that is approximately similar to the current Xcode
 clang as the primary fallback compiler, you maximize successful builds.

 If you choose the newest released clang, you get many many more build
 errors, but (arguably) function as the canary in the coal mine for finding
 software that needs fixing before Xcode finds it. This was not much fun a
 few years ago when clang 9 was first selected as our primary fallback,
 when Xcode was more like clang 5. Xcode has just now caught up to clang 9,
 as noted with all the recent VERSION errors showingbup.

 You can get an idea where the software world is by looking at what the
 linux distros are defaulting too as well.

 And as per comments you mentioned, if/when we go past clang 9 as primary
 default, we'll need to look at bootstrapping again in the clang_dependency
 PG and other places.

-- 
Ticket URL: <https://trac.macports.org/ticket/62927#comment:1>
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