[Bug 260993] lib/clang/liblldb: stable/12 fails to build: DiagnosticIDs.h:71:10: fatal error: 'clang/ Basic/DiagnosticCommonKinds.inc' file not found

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 07 Jan 2022 16:14:04 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260993

--- Comment #12 from Eugene Grosbein <eugen@freebsd.org> ---
While my image is building, I'm re-reading src.conf(5) to update my set of
knobs and I found that it refers to some "LLVM_TARGET_ALL" knob multiple times
with note that this is preferred over WITHOUT_LLVM_TARGET_*.

However, it does not document LLVM_TARGET_ALL. What is this knob for and how to
use it? I would like to speedup my build as much as possible and I do not need
any development bits in resulting image.

If possible, I'd like to avoid building clang/llvm/etc. at boostrap stage and
use possibly outdated clang/etc. binaries from base system. I'm fine with build
failing if they are too outdated and I'm fine with restarting build with
another "failsafe" set of knobs in such case.

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