CMake does not build/test doc/example.cpp

[strk]

Doesn't really need to... Does autotools do ? I guess it's enough that "make check" builds it, as it's just a build test, basically (and nobody should use the C++ interface anyway, would be about time to have an example.c)

[dbaston]

I just noticed it because Travis showed a build failure with autotools, which builds example.cpp, but not with CMake. I don't have an opinion on whether we provide an example.cpp, but if do provide one we ought to at least test that it compiles and runs.

[strk]

Agreed about testing it compiles (and sure, why not also run!). But has to be done on "make check", to not waste time on "make" (it's not meant to be a default target)

[dbaston]

Duplicate of #901