From a9dab4e4569425e26cd9c2d8bdcc74bd12fcb8bf Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Fri, 23 Apr 2021 11:13:48 -0700 Subject: 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 Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20210423181348.1801389-19-andrii@kernel.org --- tools/testing/selftests/bpf/README.rst | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'tools/testing') diff --git a/tools/testing/selftests/bpf/README.rst b/tools/testing/selftests/bpf/README.rst index 65fe318d1e71..3353778c30f8 100644 --- a/tools/testing/selftests/bpf/README.rst +++ b/tools/testing/selftests/bpf/README.rst @@ -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 -- cgit v1.2.3