What is a correct way to disable code coverage instrumentation?

[ligurio]

I'm using tests ¹ that uses LPM & Protobuf library. LPM is built using ExternalProjectAdd in CMake, see ².
Fuzzing tests are running in OSS Fuzz Infrastructure (see build.sh in ³), where Fuzz Introspector reports are built.
Unfortunately, Fuzz Introspector includes LPM and Protobuf library to reports, and due to this overall code coverage result is wrong ⁴ and Protobuf functions bothers me to analyze reports, see an example in ⁵.

What is a correct way to disable code coverage instrumentation?

I see there is LIB_PROTO_MUTATOR_HAS_NO_COVERAGE, but it is not documented.

Footnotes

1. https://github.com/ligurio/lua-c-api-tests ↩

2. https://github.com/ligurio/lua-c-api-tests/blob/e4c2a46510a72baf6e3741dbd7529e74aaf698e6/cmake/ProtobufMutator.cmake#L28-L45 ↩

3. https://github.com/google/oss-fuzz/blob/318f612d3054293201a494190715bd6a207e477c/projects/lua/build.sh#L57-L75 ↩

4. https://storage.googleapis.com/oss-fuzz-coverage/lua/reports/20230915/linux/src/testdir/build/tests/external.protobuf_mutator/src/report.html ↩

5. https://storage.googleapis.com/oss-fuzz-introspector/lua/inspector-report/20230915/fuzz_report.html#Fuzzer:-luaL_loadbuffer_proto_test ↩