toLosslessStringMaybe is not used by anything other than lib/tests, so it can be private to that file. I don't think this function was terribly well thought-through. If people start using it, we will become permanently dependent on the ability to test platforms for equality. It also makes the elaboration process more fragile, because it encourages code outside of nixpkgs to become sensitive to the minute details of how elaboration happens.
246 lines
9.7 KiB
Nix
246 lines
9.7 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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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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architectures = import ./architectures.nix { inherit lib; };
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/*
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Elaborated systems contain functions, which means that they don't satisfy
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`==` for a lack of reflexivity.
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They might *appear* to satisfy `==` reflexivity when the same exact value is
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compared to itself, because object identity is used as an "optimization";
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compare the value with a reconstruction of itself, e.g. with `f == a: f a`,
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or perhaps calling `elaborate` twice, and one will see reflexivity fail as described.
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Hence a custom equality test.
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Note that this does not canonicalize the systems, so you'll want to make sure
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both arguments have been `elaborate`-d.
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*/
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equals =
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let removeFunctions = a: lib.filterAttrs (_: v: !builtins.isFunction v) a;
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in a: b: removeFunctions a == removeFunctions b;
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/* List of all Nix system doubles the nixpkgs flake will expose the package set
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for. All systems listed here must be supported by nixpkgs as `localSystem`.
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**Warning**: This attribute is considered experimental and is subject to change.
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*/
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flakeExposed = import ./flake-systems.nix { };
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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 preferred, 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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args = if lib.isString args' then { system = args'; }
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else args';
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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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# Determine whether we can execute binaries built for the provided platform.
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canExecute = platform:
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final.isAndroid == platform.isAndroid &&
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parse.isCompatible final.parsed.cpu platform.parsed.cpu
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&& final.parsed.kernel == platform.parsed.kernel;
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isCompatible = _: throw "2022-05-23: isCompatible has been removed in favor of canExecute, refer to the 22.11 changelog for details";
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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.isWasi then "wasilibc"
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else if final.isRedox then "relibc"
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else if final.isMusl then "musl"
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else if final.isUClibc then "uclibc"
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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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else if final.isFreeBSD then "fblibc"
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else if final.isNetBSD then "nblibc"
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else if final.isAvr then "avrlibc"
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else if final.isGhcjs then null
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else if final.isNone then "newlib"
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# TODO(@Ericson2314) think more about other operating systems
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else "native/impure";
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# Choose what linker we wish to use by default. Someday we might also
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# choose the C compiler, runtime library, C++ standard library, etc. in
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# this way, nice and orthogonally, and deprecate `useLLVM`. But due to
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# the monolithic GCC build we cannot actually make those choices
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# independently, so we are just doing `linker` and keeping `useLLVM` for
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# now.
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linker =
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/**/ if final.useLLVM or false then "lld"
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else if final.isDarwin then "cctools"
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# "bfd" and "gold" both come from GNU binutils. The existence of Gold
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# is why we use the more obscure "bfd" and not "binutils" for this
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# choice.
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else "bfd";
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extensions = rec {
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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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staticLibrary =
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/**/ if final.isWindows then ".lib"
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else ".a";
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library =
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/**/ if final.isStatic then staticLibrary
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else sharedLibrary;
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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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useiOSPrebuilt = false;
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# Output from uname
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uname = {
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# uname -s
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system = {
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linux = "Linux";
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windows = "Windows";
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darwin = "Darwin";
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netbsd = "NetBSD";
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freebsd = "FreeBSD";
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openbsd = "OpenBSD";
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wasi = "Wasi";
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redox = "Redox";
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genode = "Genode";
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}.${final.parsed.kernel.name} or null;
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# uname -m
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processor =
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if final.isPower64
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then "ppc64${lib.optionalString final.isLittleEndian "le"}"
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else if final.isPower
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then "ppc${lib.optionalString final.isLittleEndian "le"}"
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else if final.isMips64
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then "mips64" # endianness is *not* included on mips64
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else final.parsed.cpu.name;
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# uname -r
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release = null;
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};
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isStatic = final.isWasm || final.isRedox;
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# Just a guess, based on `system`
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inherit
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({
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linux-kernel = args.linux-kernel or {};
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gcc = args.gcc or {};
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rustc = args.rustc or {};
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} // platforms.select final)
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linux-kernel gcc rustc;
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linuxArch =
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if final.isAarch32 then "arm"
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else if final.isAarch64 then "arm64"
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else if final.isx86_32 then "i386"
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else if final.isx86_64 then "x86_64"
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# linux kernel does not distinguish microblaze/microblazeel
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else if final.isMicroBlaze then "microblaze"
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else if final.isMips32 then "mips"
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else if final.isMips64 then "mips" # linux kernel does not distinguish mips32/mips64
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else if final.isPower then "powerpc"
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else if final.isRiscV then "riscv"
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else if final.isS390 then "s390"
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else if final.isLoongArch64 then "loongarch"
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else final.parsed.cpu.name;
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qemuArch =
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if final.isAarch32 then "arm"
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else if final.isS390 && !final.isS390x then null
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else if final.isx86_64 then "x86_64"
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else if final.isx86 then "i386"
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else if final.isMips64 then "mips64${lib.optionalString final.isLittleEndian "el"}"
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else final.uname.processor;
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# Name used by UEFI for architectures.
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efiArch =
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if final.isx86_32 then "ia32"
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else if final.isx86_64 then "x64"
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else if final.isAarch32 then "arm"
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else if final.isAarch64 then "aa64"
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else final.parsed.cpu.name;
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darwinArch = {
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armv7a = "armv7";
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aarch64 = "arm64";
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}.${final.parsed.cpu.name} or final.parsed.cpu.name;
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darwinPlatform =
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if final.isMacOS then "macos"
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else if final.isiOS then "ios"
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else null;
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# The canonical name for this attribute is darwinSdkVersion, but some
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# platforms define the old name "sdkVer".
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darwinSdkVersion = final.sdkVer or (if final.isAarch64 then "11.0" else "10.12");
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darwinMinVersion = final.darwinSdkVersion;
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darwinMinVersionVariable =
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if final.isMacOS then "MACOSX_DEPLOYMENT_TARGET"
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else if final.isiOS then "IPHONEOS_DEPLOYMENT_TARGET"
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else null;
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} // (
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let
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selectEmulator = pkgs:
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let
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qemu-user = pkgs.qemu.override {
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smartcardSupport = false;
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spiceSupport = false;
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openGLSupport = false;
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virglSupport = false;
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vncSupport = false;
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gtkSupport = false;
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sdlSupport = false;
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pulseSupport = false;
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smbdSupport = false;
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seccompSupport = false;
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enableDocs = false;
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hostCpuTargets = [ "${final.qemuArch}-linux-user" ];
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};
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wine = (pkgs.winePackagesFor "wine${toString final.parsed.cpu.bits}").minimal;
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in
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if pkgs.stdenv.hostPlatform.canExecute final
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then "${pkgs.runtimeShell} -c '\"$@\"' --"
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else if final.isWindows
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then "${wine}/bin/wine${lib.optionalString (final.parsed.cpu.bits == 64) "64"}"
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else if final.isLinux && pkgs.stdenv.hostPlatform.isLinux && final.qemuArch != null
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then "${qemu-user}/bin/qemu-${final.qemuArch}"
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else if final.isWasi
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then "${pkgs.wasmtime}/bin/wasmtime"
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else if final.isMmix
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then "${pkgs.mmixware}/bin/mmix"
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else null;
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in {
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emulatorAvailable = pkgs: (selectEmulator pkgs) != null;
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emulator = pkgs:
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if (final.emulatorAvailable pkgs)
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then selectEmulator pkgs
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else throw "Don't know how to run ${final.config} executables.";
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}) // mapAttrs (n: v: v final.parsed) inspect.predicates
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// mapAttrs (n: v: v final.gcc.arch or "default") architectures.predicates
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// args;
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in assert final.useAndroidPrebuilt -> final.isAndroid;
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assert lib.foldl
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(pass: { assertion, message }:
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if assertion final
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then pass
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else throw message)
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true
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(final.parsed.abi.assertions or []);
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final;
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}
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