Compiling project with modified version of RooAbsArg

[Xola]

Hi guys.

So I am trying to compile my project using a version of RooAbsArg, that I copied into my local directory and has a tiny modification. I am trying to get rid of the following error message:

duplicate symbol 'vtable for RooRefArray' in:
    libRooAbsArg.a(RooAbsArg.cxx.o)
    libRooAbsArg.a(G__RooAbsArg.cxx.o)
duplicate symbol 'typeinfo name for RooRefArray' in:
    libRooAbsArg.a(RooAbsArg.cxx.o)
    libRooAbsArg.a(G__RooAbsArg.cxx.o)
duplicate symbol 'typeinfo for RooRefArray' in:
    libRooAbsArg.a(RooAbsArg.cxx.o)
    libRooAbsArg.a(G__RooAbsArg.cxx.o)
duplicate symbol 'RooRefArray::Streamer(TBuffer&)' in:
    libRooAbsArg.a(RooAbsArg.cxx.o)
    libRooAbsArg.a(G__RooAbsArg.cxx.o)
ld: 4 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [StandardHypoTestInv] Error 1
make[2]: *** [CMakeFiles/StandardHypoTestInv.dir/all] Error 2
make[1]: *** [CMakeFiles/StandardHypoTestInv.dir/rule] Error 2
make: *** [StandardHypoTestInv] Error 2

I know the problem has to do with pragma commands in my cmake file. This is how the ADD_LIBRARY_DEF function in my CMakeLists looks

function(ADD_LIBRARY_LINK_DEF1 NAME)
    file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/RootDict/${NAME}Dict_LinkDef.h"
            "#ifdef __CINT__\n"


            "#pragma link C++ nestedclasses;\n"
            "#pragma link C++ nestedtypedefs;\n"
            "#pragma link C++ class RooAbsArg- ;\n"
            "pragma link C++ class RooRefArray- ;\n"
            "#pragma link C++ defined_in \"${CMAKE_CURRENT_SOURCE_DIR}/inc/${NAME}.h\";\n"
#                        "#pragma link C++ class RooSTLRefCountList<RooAbsArg>-;\n"

            "#endif\n")

    root_generate_dictionary(
            G__${NAME}
            ${NAME}.h
            LINKDEF
            "${CMAKE_CURRENT_BINARY_DIR}/RootDict/${NAME}Dict_LinkDef.h"
    )
    link_libraries(RooFit)
    option(BUILD_SHARED_LIBS ON)
    #    find_library(RooFit /Users/cashcrusaders/Applications/root-6.18.04_hist/root-6.18.04-builddir/lib/ )
    add_library(${NAME} G__${NAME}.cxx ${NAME}.cxx )
    #    add_library(${NAME}_DYN SHARED G__${NAME}.cxx ${NAME}.cxx)
    #    set(SOURCE_FILE RooWorkspace.cxx)
    target_link_libraries(${NAME} PUBLIC ${ROOT_LIBRARIES})

    # Link to ROOT's Minuit 2 if available, otherwise standalone edition
    if(TARGET ROOT::Minuit2)
        target_link_libraries(${NAME} PUBLIC ROOT::Minuit2)
    else()
        target_link_libraries(${NAME} PUBLIC Minuit2::Minuit2)
    endif()
endfunction()

Please help!

[couet]

May be @moneta has an idea about your problem.

[eguiraud]

Hi,
if you want to use your own version of RooAbsArg you probably have to patch the ROOT source and recompile ROOT, otherwise you will have some symbols redefined…

[Xola]

Ok I will search the net to find ways to patch ROOT and get back to you. But I thought that maybe there’s a little command that I can use in the function that generates LinkDef files to
make the error go away.

[eguiraud]

You have to clone the ROOT sources via git, modify them, and then build ROOT as described here. It’s what ROOT developers do every day (often multiple times per day). If you want to run a modified version of ROOT, that’s the proper way.

Cheers,
Enrico