Strange Multiple Definition Errors

[A123]

I'm getting a set of strange multiple definition errors moving my project into QtCreator. The short of it is it complains about multiple definitions of a function and then points back to a different function or it points to the object file of the function. Or it will point to the boost library and I'm not sure why.

Here is a sample error

/home/blah/Documents/HS/MP/HP/OSM/org/src/common/op/Config.cc:6: error: multiple definition of `Configuration::type_of_cross_over()'

first defined here
/home/blah/Documents/HS/MP/HP/OSM/org/src/common/op/Config.cc:6:

/home/blah/Documents/HS/MP/HP/build-OSM-Desktop-Debug/Config.o:-1: In function `Configuration::nb_offsprings_of_cross_over()':

Here is Config. cc

https://pastebin.com/QJqtDzfn

Here is Config.h

https://pastebin.com/hW9j5qrQ

Here is an error pointing to the boost library

/usr/include/boost/math/tools/detail/rational_horner3_17.hpp:1031: error: multiple definition of `CMAES::CMAES(BaseOptimizationProblem*, std::string const&)'

/usr/include/boost/math/tools/detail/rational_horner3_17.hpp:1031: first defined here

/home/blah/Documents/HS/MercurialProjects/HP/build-OSM-Desktop-Debug/CMAES.o:-1: In function `CMAES::~CMAES()':

Here is the horner file from Boost

https://pastebin.com/tcTrDuqd

Here is CMAES.cc

https://pastebin.com/6eMKvLkY

Here is CMAES.h

https://pastebin.com/7M03CEg4

[dheerendra]

This error clearly indicates that same file is compiled twice in your build. I suggest you to look what are different places this file config.cc is included in your build.