gcov/lcov problems with branch coverage and c++

[Sven Eppler <sven at sveneppler dot de>]

Hello,
we are using GCOV/LCOV to produce test coverage for our projects.
Recently we tried to enable branch-coverage additionally.
But it looks like, this just doesn't yield the results we expected from 
a high level developer view.

Using branch-coverage with C++ blows the report up with branches all 
over the place.
We suspect (as the searching for the issues indicates) that mostly 
exception handling code
creates these "hidden branches". And GCOV/LCOV doesn't seem to skip over 
these.

I created a small test project to show the problem:

   https://github.com/ghandmann/lcov-branch-coverage-weirdness

Currently we use Ubuntu 16.04. with:
 - gcc v5.4
 - lcov & genhtml v1.12

Our production code is build with c++11 enabled. The minimal example 
isn't build with c++11 enabled,
but as we experimented a bit with all different options (c++ standard, 
optimization, -fno-exceptions)
we didn't came up with a passable result.

Anybody got some ideas? Hints? Are we using anything the wrong way?
Is this - as stated somewhere else - really expected behavior?

Thanks four your time!

Best regards
Sven

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