Environment: Linux Mint 17.3
The U++ IDE compiles and installs okay.
However, as we start to build our application from scratch, errors emit during compile of Core/Mt.cpp.
The complaint is multiple definitions of Upp::ReadMemoryBarrier() and Upp::WriteMemoryBarrier().

An in-line version of this method is enabled in Mt.h at the same time that
the method is enabled for compile in Mt.cpp.

Our build flags: GCC GUI X11 MT DEBUG M32

We are not using either of these methods in our application.
As a work-around, I used #if 0 around each method in the Mt.cpp file in order to compile without errors.

Here is a session snapshot that demonstrates the issue of just trying to compile Core/Mt.cpp and
the errors that emit.