managed to resolve myself.
Apparently these are just warning messages and are only preventing successful compilation because of the -Werror flag in the makefile. Removed that flag and it now compiles successfully

@mitu FANTASTIC !!!!
Everythings working with lr-fmsx!!! I focused to much on Lr-BlueMSX. For Lr-BlueMSX, It's only playable with keyboard . The joypad working only for Coleco. Not enough gamepad buttons are associated with basics keyboard fonctions. They should enable the "RetroPad Keyboard Map - Joypad - Awaiting description" option in Control menu in RetroArch for MSX.
Thank you
REGARDS

@Solid-One yes if you are already in retroarch systems the order wont change but when you exit and go back in it takes usb order as was the case in your situation.

@krullbeast said in can udev read i2c and hardwired GPIO buttons simultaneously?:

do you think it is possible to read the i2c data and also the A and B buttons inside of retroarch?

Not an expert on this, but I think RetroArch doesn't read directly from GPIO (I2C or otherwise), instead it uses an established input driver (udev/sdl/etc.) - https://github.com/libretro/RetroArch/tree/master/input/drivers.

@backstander

I don't think so. I'm looking for a file that would effect one game only. I suppose I could do it for all games at a push.

Nevermind.... it doesn't work.

I tried redoing my configs because the switch pro controller would get recognized 1/4 of the time. Ended up with the Pi detecting the pro controller but not the switch pro controller.... I don't get with this is so difficult with the switch...

@alistaircg which folder are you running the roms from? /roms/mame-libretro?

@tmntturtlguy It's a zero.

@skeggylad Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first (as agreed when registering).