Adam Joseph 20b62456f0 lib/systems/parse.nix: add, use removeAbiSuffix ...

gnu-config will ignore the portion of a triple matching the regex
`e?abi.*$` when determining the validity of a triple.  In other
words, `i386-linuxabichickenlips` is a valid triple.

This commit updates our parsing routines to match gnu-config.

I was recently surprised to discover that it is in fact possible to
shoehorn ABI flavors into nix doubles in a way which preserves their
property of being a (non-canonical) subset of the valid gnu-config
triples.  This commit is required in order to exploit that discovery
to add automatic detection of ILP32 platforms (64-bit void*, 32-bit
int, like the Apple Watch and MIPS n32) to Nix.

2023-10-22 17:05:05 -07:00

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