Bruno, your original question was entirely reasonable. I remember trying to figure that out a while back too, before settling on WiiFlow for that purpose. (I also very much prefer USB Loader GX to the other options.)
I think this is beyond me. Retroarch's Wiimote support is too tightly integrated with its other controller support. I opened an issue here: https://github.com/libretro/RetroArch/issues/1009
Hopefully someone knowledgable is up for tackling it.
Shadowcaster, I was finally able to successfully build Retroarch, and I included a modified libwiiuse.a with the change you detailed. Even then though, I'm still having controller problems with my Wii U Tekken Tag Tournament stick.
The stick works perfectly in your Genesis Plus GX build now...
I spent a while last night trying to get a working devkitPro toolchain going. I got it working, but while I can successfully build a modified libogc, I'm having trouble building Retroarch Wii successfully.
Shadowcaster, thanks for rebuilding Genesis Plus! The no-analog patch version works great with my fight stick. Any chance you'd be able to build retroarch too? If not it's cool; thank you for the Genplus build. :)
The Madcatz WiiU Tekken Stick reports itself as a controller classic, but is broken in all the same ways listed here. I tested with the genplus zip and things seem to be working great with the existing patched.
Any chance of getting an updated Genplus GX? Ekeke is on version 1.7.4 now. I also...