[Bug 264192] lang/ghc: poudriere based build used odd mix of devel/llvm10 and system toolchain

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264192

--- Comment #39 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Gleb Popov from comment #38)

I'm confused. How does the Ports Framework know when to
use LLVM10 clang (bootstrap 8.10.7) vs. LLVM12 clang
(9.2.4)? (No system-clang use as far as I can tell.)

As far as I can tell, LLC and OPT and clang use have to
match for each of the two types of sub-builds --unless
there is no clang use at all. Mixing LLVM10, LLVM12,
and/or system-clang materials looks to be incoherent.

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