coverage analysis with template-heavy code

Dear all,

maybe this was asked already or is documented elsewhere. In this case, please point me in the right direction.

I want to compute code coverage of a C++ program. Since some time, llvm/clang can do this. Apparently, this functionality has moved from clang into clang some time back (I had an old checkout where it appeared to be in clang, now it appears to be in llvm).

Now, I tested this and it worked just like GCC. While this is nice for most people, I would like to do more. Here is where I see limitations with being on par with GCC:

Our library consists almost only of templates. If a template is instantiated, the instrumented clang output gives me branches etc. as I would expect. However, no code is generated for template functions and thus no code is generated.

I would like to programatically find such uninstantiated functions, however.

What is the best way to do so? Would it be possible/make sense to extend the llvm/clang instrumentation such that a dummy symbol is generated for each uninstantiated template function?