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lib/systems/parse.nix: add, use removeAbiSuffix

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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.
This commit is contained in:
Adam Joseph 2023-06-07 09:39:42 -07:00
parent 3d7a169afe
commit 20b62456f0
1 changed files with 10 additions and 1 deletions
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11
lib/systems/parse.nix
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@ -29,6 +29,15 @@ let
assert type.check value;
setType type.name ({ inherit name; } // value));
# 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.
removeAbiSuffix = x:
let match = builtins.match "(.*)e?abi.*" x;
in if match==null
then x
else lib.elemAt match 0;
in
rec {
@ -466,7 +475,7 @@ rec {
else vendors.unknown;
kernel = if hasPrefix "darwin" args.kernel then getKernel "darwin"
else if hasPrefix "netbsd" args.kernel then getKernel "netbsd"
else getKernel args.kernel;
else getKernel (removeAbiSuffix args.kernel);
abi =
/**/ if args ? abi then getAbi args.abi
else if isLinux parsed || isWindows parsed then