[CMake] -rdynamic again

[Ilias Miroslav]

Ad: http://www.cmake.org/pipermail/cmake/2012-November/052773.html

Hi, this  good point - having possibility to modify linker flags, which are set up automatically.

I am struggling (http://www.cmake.org/pipermail/cmake/2012-November/052833.html) with offending libraries beeing added to linker flags. For static linking "-rdynamic" flag is sometimes contraproductive.

Best, Miro