libretro/RetroArch#14925 will be updating RetroArch to compile with the modern Wii U toolchain instead of the old version with which it builds currently. In the time since libretro updated the toolchain, the -mwup flag was removed from the compiler. @Ploggy has already submitted a PR libretro/mrboom-libretro#28 against the libretro fork which supports both toolchain versions, but I'm not sure whether development occurs here or there, so just covering all bases in case it needs to be merged over here first or synced from there after merge, etc.
libretro/RetroArch#14925 will be updating RetroArch to compile with the modern Wii U toolchain instead of the old version with which it builds currently. In the time since libretro updated the toolchain, the
-mwup
flag was removed from the compiler. @Ploggy has already submitted a PR libretro/mrboom-libretro#28 against the libretro fork which supports both toolchain versions, but I'm not sure whether development occurs here or there, so just covering all bases in case it needs to be merged over here first or synced from there after merge, etc.