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In my environment, >> I am always having LLVM_IAS=1 regardless of >> whether LTO is enabled or not. >> >> After kernel is build with clang, the following command >> can be used to build selftests with clang: >>    make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1 > > Will it use clang to compile libbpf and bpftool as well? Yes. selftests, libbpf and bpftool will be all built with clang.