[CMake] Sharing sources between two targets

[Rolf Eike Beer]

Nick Gnedin wrote:
> That doubles the size of the executable, because if I do something like
> that:
> 
> ADD_LIBRARY(temp STATIC ${sources})
> TARGET_LINK_LIBRARIES(temp outside_deps)
> 
> ADD_EXECUTABLE(code main.cpp)
> TARGET_LINK_LIBRARIES(code temp)
> 
> then TARGET_LINK_LIBRARIES(...) also add outside_deps as link libraries
> for code, so they end up included twice.

You can't link anything into a static library, so it will end up being linked 
in only once anyway.

Eike
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