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selftests/bpf: Document latest Clang fix expectations for linking tests 

Document which fixes are required to generate correct static linking
selftests.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210423181348.1801389-19-andrii@kernel.org
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Andrii Nakryiko 2021-04-23 11:13:48 -07:00 committed by Alexei Starovoitov
parent 3b2ad50225
commit a9dab4e456
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tools/testing/selftests/bpf/README.rst
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@ -193,3 +193,12 @@ Without it, the error from compiling bpf selftests looks like:
libbpf: failed to find BTF for extern 'tcp_slow_start' [25] section: -2
__ https://reviews.llvm.org/D93563
Clang dependencies for static linking tests
===========================================
linked_vars, linked_maps, and linked_funcs tests depend on `Clang fix`__ to
generate valid BTF information for weak variables. Please make sure you use
Clang that contains the fix.
__ https://reviews.llvm.org/D100362