[Rd] package matrix dummy.cpp

[Ambrus Kaposi]

Hi,

The recommended package matrix contains an empty file src/dummy.cpp
which results in using g++ instead of gcc to link Matrix.so.
What is the reason for that? Is there any difference between using g++
or gcc? (There are no other cpp files in the source)
I asked the maintainers of the package (matrix-authors at r-project.org)
3 weeks ago but haven't received any answer.
On my system (NixOS Linux distribution, http://nixos.org) I can't
compile package Matrix unless this file is deleted.

Thank you very much,
Ambrus Kaposi