Refer to the RISC-V C API document for preprocessor definitions #61
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The list in this document is incomplete, and the riscv-c-api-doc repo has since been created to hold this kind of information. Let's just point there rather than trying to maintain the same information in two places.
That document doesn't mention that older version of GCC defined
__riscv__
but I think this is just a historical curiousity at this point, so this isn't a real loss of information.