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Combines two improvements to the Nix build infrastructure:
1. Deduplicate nix/lib.nix (995 → ~700 lines, 30% reduction):
- Extract shared data lists (modules, C sources, headers, symbols)
and helper functions into top-level let bindings
- Merge mkIOSLib + mkWatchOSLib into internal mkAppleStaticLib
parameterised by platform; public API preserved via thin wrappers
- Merge mkSimulatorApp + mkWatchOSSimulatorApp into internal
mkAppleSimulatorApp; public API preserved
- Replace 14 repetitive NDK compile blocks with map over list
- Hoist applePkgs, appleGhc, gmpStatic, libffiStatic to top-level
2. Build hatter as a cached cabal package for iOS/watchOS:
- ios-deps.nix: add hatterSrc param, build hatter via callCabal2nix
so the .a and package DB entry are cached
- ios.nix, watchos.nix: pass hatterSrc to ios-deps.nix
- mkAppleStaticLib: when crossDeps is provided, only compile
Main.hs + run_main.c instead of all 22 modules + 19 C sources
- Standalone fallback (crossDeps == null) preserved
Adding a new bridge module now means editing 1 list, not 6+ places.
Demo apps and consumers only recompile their entry point.
Prompt: combine PR #213 and #214 into a single PR
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…-cache Refactor nix/lib.nix and cache hatter for iOS/watchOS
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This branch is so I can merge stuff while not testing out on IOS, need to test this branch on ios to confirm stuff keeps working before merging in master