c26252af3e
First, we need check against the host platform, not the build platform. That's simple enough. Second, we move away from exahustive finite case analysis (i.e. exhaustively listing all platforms the package builds on). That only work in a closed-world setting, where we know all platforms we might build one. But with cross compilation, we may be building for arbitrary platforms, So we need fancier filters. This is the closed world to open world change. The solution is instead of having a list of systems (strings in the form "foo-bar"), we have a list of of systems or "patterns", i.e. attributes that partially match the output of the parsers in `lib.systems.parse`. The "check meta" logic treats the systems strings as an exact whitelist just as before, but treats the patterns as a fuzzy whitelist, intersecting the actual `hostPlatform` with the pattern and then checking for equality. (This is done using `matchAttrs`). The default convenience lists for `meta.platforms` are now changed to be lists of patterns (usually a single pattern) in `lib/systems/for-meta.nix` for maximum flexibility under this new system. Fixes #30902
51 lines
2.1 KiB
Nix
51 lines
2.1 KiB
Nix
{ lib }:
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let inherit (lib.attrsets) mapAttrs; in
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rec {
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doubles = import ./doubles.nix { inherit lib; };
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forMeta = import ./for-meta.nix { inherit lib; };
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parse = import ./parse.nix { inherit lib; };
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inspect = import ./inspect.nix { inherit lib; };
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platforms = import ./platforms.nix { inherit lib; };
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examples = import ./examples.nix { inherit lib; };
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# Elaborate a `localSystem` or `crossSystem` so that it contains everything
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# necessary.
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#
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# `parsed` is inferred from args, both because there are two options with one
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# clearly prefered, and to prevent cycles. A simpler fixed point where the RHS
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# always just used `final.*` would fail on both counts.
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elaborate = args: let
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final = {
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# Prefer to parse `config` as it is strictly more informative.
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parsed = parse.mkSystemFromString (if args ? config then args.config else args.system);
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# Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
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system = parse.doubleFromSystem final.parsed;
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config = parse.tripleFromSystem final.parsed;
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# Just a guess, based on `system`
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platform = platforms.selectBySystem final.system;
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# Derived meta-data
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libc =
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/**/ if final.isDarwin then "libSystem"
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else if final.isMinGW then "msvcrt"
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else if final.isMusl then "musl"
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else if final.isAndroid then "bionic"
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else if final.isLinux /* default */ then "glibc"
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# TODO(@Ericson2314) think more about other operating systems
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else "native/impure";
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extensions = {
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sharedLibrary =
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/**/ if final.isDarwin then ".dylib"
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else if final.isWindows then ".dll"
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else ".so";
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executable =
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/**/ if final.isWindows then ".exe"
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else "";
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};
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# Misc boolean options
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useAndroidPrebuilt = false;
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} // mapAttrs (n: v: v final.parsed) inspect.predicates
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// args;
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in assert final.useAndroidPrebuilt -> final.isAndroid;
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final;
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}
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