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With the most recent Clang, alu32 is enabled by default if -mcpu=probe or -mcpu=v3 is specified. Use a separate build rule with -mcpu=v2 to enforce no ALU32 mode. Suggested-by: Yonghong Song <yhs@fb.com> Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20191120002510.4130605-1-andriin@fb.com