[CMake] ExternalProject_Add and inheritance

[Cedric Doucet]

Hello, 

I use the ExternalProject_Add command to manage third-party libraries. 
In the same time, I need to overcome some compatibility problems between GCC 4 and GCC 5 (strings are not defined in the same way in the STL). 
The solution I use is the one given here: 
http://stackoverflow.com/questions/33500337/how-to-handle-dual-abi-in-gcc-5 
It allows me to force to use the libstdc++.so given by the GCC repository given to the cmake command. 

The problem is that trick does not work with the ExternalProject_Add command because configuration steps of third-party libraries are autonomous. 
Do you know how to solve the problem? 

For example, if I use the ExternalProject_Add command to manage a third-library whose configuration also depends on a cmake script, how could I tell this script to use the compilers and the libstdc++.so I provided to my own cmake script? 

Best, 

Cédric 
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