[darknet/yolo] new port

[cenit]

We finished a big rework of darknet to make it more easily buildable on windows. It is possible now to build it with vcpkg without any big effort.
The port is still very much untested, but we can iterate quickly on it also from the repository point of view, not just on this portfile.
Any suggestion is really appreciated and any issue will be taken into consideration

[vicroms]

Hi @cenit

Thanks for the port!

I see failures on UWP and ARM because pthreads fails to build on those platforms.

The current pthreads port is using a no-longer-mantained library pthreads-w32, but I haven't got around updating it to pthreads4w. Aside from the discussion of whether the package should be findable by find_package(pthreads4w) instead of just find_package(pthreads)....

If you're OK with no support for UWP and ARM, please add a validation with an explicit failure message "darknet doesn't support UWP/ARM".

Another thing, I got file conflicts with stb when installing locally:

Building package darknet[core,weights]:x64-windows... done
Installing package darknet[core,weights]:x64-windows...
The following files are already installed in D:/github/vcpkg/installed/x64-windows and are in conflict with darknet:x64-windows
    include/stb_image.h
    include/stb_image_write.h

PS D:\github\vcpkg> ./vcpkg owns stb_image.h
stb:x64-windows: x64-windows/include/stb_image.h

[cenit]

Hi @vicroms
Thanks for the quick feedback. I will add an explicit failure message for uwp/arm and I will also try to use stb from vcpkg in the port. It should be almost fully compatible, I think it’s the best option going forward.
Next step will also be an update to pthread, but in another PR.

[cenit]

I forgot to add an explicit failure message for uwp/arm, will do it asap