From 5ad0a415da6be8c13ed45c655e5acc9fa93557a9 Mon Sep 17 00:00:00 2001 From: KP Singh Date: Mon, 7 Mar 2022 13:30:47 +0000 Subject: [PATCH] bpf/docs: Update vmtest docs for static linking Dynamic linking when compiling on the host can cause issues when the libc version does not match the one in the VM image. Update the docs to explain how to do this. Before: ./vmtest.sh -- ./test_progs -t test_ima ./test_progs: /usr/lib/libc.so.6: version `GLIBC_2.33' not found (required by ./test_progs) After: LDLIBS=-static ./vmtest.sh -- ./test_progs -t test_ima test_ima:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Reported-by: "Geyslan G. Bem" Signed-off-by: KP Singh Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220307133048.1287644-1-kpsingh@kernel.org --- tools/testing/selftests/bpf/README.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/bpf/README.rst b/tools/testing/selftests/bpf/README.rst index d099d91adc3b6..afe5ab2763bff 100644 --- a/tools/testing/selftests/bpf/README.rst +++ b/tools/testing/selftests/bpf/README.rst @@ -32,6 +32,14 @@ For more information on about using the script, run: $ tools/testing/selftests/bpf/vmtest.sh -h +In case of linker errors when running selftests, try using static linking: + +.. code-block:: console + + $ LDLIBS=-static vmtest.sh + +.. note:: Some distros may not support static linking. + .. note:: The script uses pahole and clang based on host environment setting. If you want to change pahole and llvm, you can change `PATH` environment variable in the beginning of script. -- 2.30.2