multiple definition of `gImGuiUserEventCallback'

[traw]

I am using CMake to compile imgui with SDL-bindings, It give following error

../CMakeFiles/IMGUI_OBJS.dir/imgui-Flix01/imgui.cpp.o:(.bss+0x1f0): multiple definition of `gImGuiUserEventCallback'
CMakeFiles/Proj.dir/app.cpp.o:(.data+0xb0): first defined here
collect2: error: ld returned 1 exit status
src/CMakeFiles/Proj.dir/build.make:585: recipe for target 'bin/Proj' failed
make[2]: *** [bin/Proj] Error 1
CMakeFiles/Makefile2:196: recipe for target 'src/CMakeFiles/Proj.dir/all' failed
make[1]: *** [src/CMakeFiles/Chokidar.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

If I comment line number 20 of imguibindings.cpp

//ImImplVoidDelegateTakingVoidPtr gImGuiUserEventCallback = NULL;

it works fine. I think it's consequence of extern keyword.

[Flix01]

This is a duplicate of #22 (you should have reopened that).

Anyway, there's only only definition of ImImplVoidDelegateTakingVoidPtr gImGuiUserEventCallback = NULL;, and it's at line number 20 of imguibindings.cpp.

If you have multiple definitions, it means you have defined it somewhere else (for example in your file: app.cpp).

Can you try to:
option (1): declare it extern in app.cpp, or
option (2): just include imguibindings.h from app.cpp, removing the additional declaration of gImGuiUserEventCallback from it
and see if it works ?

Otherwise you must have compiled imguibindings.cpp twice (maybe included from multiple cpp files). Can you check it please ?

[traw]

Thanks I'll look check that

[traw]

Thanks for pointing it out I just check I have defined it in my application.