[PATCH bpf-next 1/2] bpf/docs: Update vmtest docs for static linking

[KP Singh <kpsingh@kernel.org>]

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" <geyslan@gmail.com>
Signed-off-by: KP Singh <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 d099d91adc3b..f7fa74448492 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
 
+Incase 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.
-- 
2.35.1.616.g0bdcbb4464-goog