[Bug 240507] WITHOUT_CLANG=yes WITH_CLANG_BOOTSTRAP=yes does not work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240507

--- Comment #2 from Dimitry Andric <dim at FreeBSD.org> ---
(In reply to Kyle Evans from comment #0)
> Can we consider enabling all LLVM_TARGET_* knobs for the bootstrap/cross-compiler clang, and leaving those user-controlled knobs to be purely for the clang that's getting installed

The problem with that is that a lot of unused targets will be built, which is
why the MK_LLVM_TARGET_ knobs were created in the first place.  Ideally, only
the minimum set of targets is built.

That said, I agree that WITHOUT_CLANG should not immediately cause all
MK_LLVM_TARGET_ knobs to be turned off.  However, the logic in share/mk/*.mk to
achieve all this is very convoluted and fragile, so I would rather defer to an
expert in that area. :)

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