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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260993

--- Comment #14 from Ed Maste <emaste@freebsd.org> ---
(In reply to Eugene Grosbein from comment #12)
If you don't need a toolchain in the target just set WITHOUT_TOOLCHAIN. It
covers these (from share/mk/src.opts.mk):

.if ${MK_TOOLCHAIN} == "no"
MK_CLANG:=      no
MK_INCLUDES:=   no
MK_LLD:=        no
MK_LLDB:=       no
MK_LLVM_BINUTILS:=      no
.endif

The Cirrus-CI builds use the following command for quick builds:

su user -c "make -j$(sysctl -n hw.ncpu) CROSS_TOOLCHAIN=llvm13
WITHOUT_TOOLCHAIN=yes buildworld buildkernel"

If you want to just use whatever the host compiler is, and avoid building
toolchain for the target, I think you could use:

WITHOUT_CLANG_BOOTSTRAP
WITHOUT_LLD_BOOTSTRAP
WITHOUT_ELFTOOLCHAIN_BOOTSTRAP # this one won't save much
WITHOUT_TOOLCHAIN

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