https://clang.llvm.org/docs/SourceBasedCodeCoverage.html

Basically, the following flags need to be added to CFLAGS / CXXFLAGS:

    -fprofile-instr-generate -fcoverage-mapping


Neither of sanitizers are needed for that build.

There are two goals here:

1) to see how many project would fail during the build 

2) to see how build sizes for different project would change

The second point may help us to debug  issue 759795 , as we need a smaller reproducer that has the same build size overhead.