Mysteries of WITHOUT_LLVM_TARGET…

[Graham Perrin]

FreeBSD momh167-gjp4-8570p 13.0-CURRENT FreeBSD 13.0-CURRENT r344013 
GENERIC-NODEBUG  amd64

In the environment above, if I add the six lines below to
/etc/make.conf
which one of the six will cause me to shoot myself in the foot?

WITHOUT_LLVM_TARGET_AARCH64=
WITHOUT_LLVM_TARGET_ARM=
WITHOUT_LLVM_TARGET_MIPS=
WITHOUT_LLVM_TARGET_POWERPC=
WITHOUT_LLVM_TARGET_SPARC=
WITHOUT_LLVM_TARGET_X86=