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It's very easy to miss compilation warnings without -Werror, which is not set for selftests. libbpf and bpftool are already strict about this, so make selftests/bpf also treat compilation warnings as errors to catch such regressions early. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20220120060529.1890907-2-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>