[swift-users] Swift can’t compile code with OpenGL function pointers

Elia Cereda eliacereda at gmail.com
Thu Mar 30 10:56:06 CDT 2017

Hi Kelvin,

Do you mind sharing the code you’re using? I’m looking back at some code I wrote a while back to learn OpenGL and I see that the implementation was pretty straightforward.

The OpenGL.GL module already provides the implementations for runtime functions such as glEnable, glBlendFunc and glClearColor. In my code I just import that and use those functions the same way you use any other function.

Elia Cereda

> Il giorno 30 mar 2017, alle ore 16:47, Kelvin Ma via swift-users <swift-users at swift.org> ha scritto:
> OpenGL functions are loaded at runtime by a function loader (like GLFW). They’re defined in a header but obviously they don’t have definitions at compile time so it causes a slew of linker errors when I try to build
>     error: undefined reference to 'glEnable'
>     error: undefined reference to 'glBlendFunc'
>     error: undefined reference to 'glClearColor'
>     clang: error: linker command failed with exit code 1 (use -v to see invocation)
>     ...
> How do I build programs that use OpenGL functions?
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