Dude, when I released the open source HBC (and made a point of trying to build it with the latest devkitPPC/libogc) I had to spend an hour changing a metric fuckload of of types/printf stuff that had changed. Worked on Dolphin but others said not on real HW.
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You reckon? https://devel.rtems.org/ticket/3384 And there's some interesting stuff if you dig around in here https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01441.html … It's a long standing weirdness with gcc/newlib on 32bit platforms afaict. https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01555.html … is of particular interest
I meant on desktop linux/glibc. Yeah, newlib has always had some, er, "interesting" quirks (which is why I avoid it for baremetal stuff if at all possible... I'd much rather drop in printf.c and malloc.c than have to deal with that ball of hair).