People have used mrustc like that to put rust on a c64. The number of targets that make sense from a word length perspective that aren't already supported by llvm are pretty small I think? You aren't going to compile rust to some fixed point dsp where a long is 48bits. The c anything is likely to generate won't compile in whatever odd not-quite-ansi c compiler the chip maker provides.
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People have used mrustc like that to put rust on a c64. The number of targets that make sense from a word length perspective that aren't already supported by llvm are pretty small I think? You aren't going to compile rust to some fixed point dsp where a long is 48bits. The c anything is likely to generate won't compile in whatever odd not-quite-ansi c compiler the chip maker provides.