439 lines
18 KiB
Nix
439 lines
18 KiB
Nix
{ lib }:
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let
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inherit (lib)
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any
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filterAttrs
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foldl
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hasInfix
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isFunction
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isList
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isString
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mapAttrs
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optional
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optionalAttrs
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optionalString
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removeSuffix
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replaceStrings
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toUpper
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;
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inherit (lib.strings) toJSON;
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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: filterAttrs (_: v: !isFunction v) a;
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in a: b: removeFunctions a == removeFunctions b;
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/**
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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}
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This attribute is considered experimental and is subject to change.
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:::
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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 isString args' then { system = args'; }
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else args';
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# TODO: deprecate args.rustc in favour of args.rust after 23.05 is EOL.
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rust = args.rust or args.rustc or {};
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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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useLLVM = final.isFreeBSD || final.isOpenBSD;
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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.isWasm && !final.isWasi then null
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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.isOpenBSD then "oblibc"
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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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# The standard lib directory name that non-nixpkgs binaries distributed
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# for this platform normally assume.
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libDir = if final.isLinux then
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if final.isx86_64 || final.isMips64 || final.isPower64
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then "lib64"
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else "lib"
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else null;
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extensions = optionalAttrs final.hasSharedLibraries {
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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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} // {
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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 final.extensions.staticLibrary
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else final.extensions.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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}.${final.parsed.kernel.name} or null;
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# uname -m
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processor =
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if final.isPower64
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then "ppc64${optionalString final.isLittleEndian "le"}"
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else if final.isPower
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then "ppc${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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# It is important that hasSharedLibraries==false when the platform has no
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# dynamic library loader. Various tools (including the gcc build system)
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# have knowledge of which platforms are incapable of dynamic linking, and
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# will still build on/for those platforms with --enable-shared, but simply
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# omit any `.so` build products such as libgcc_s.so. When that happens,
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# it causes hard-to-troubleshoot build failures.
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hasSharedLibraries = with final;
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(isAndroid || isGnu || isMusl # Linux (allows multiple libcs)
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|| isDarwin || isSunOS || isOpenBSD || isFreeBSD || isNetBSD # BSDs
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|| isCygwin || isMinGW || isWindows # Windows
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|| isWasm # WASM
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) && !isStatic;
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# The difference between `isStatic` and `hasSharedLibraries` is mainly the
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# addition of the `staticMarker` (see make-derivation.nix). Some
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# platforms, like embedded machines without a libc (e.g. arm-none-eabi)
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# don't support dynamic linking, but don't get the `staticMarker`.
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# `pkgsStatic` sets `isStatic=true`, so `pkgsStatic.hostPlatform` always
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# has the `staticMarker`.
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isStatic = final.isWasi || 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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} // platforms.select final)
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linux-kernel gcc;
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# TODO: remove after 23.05 is EOL, with an error pointing to the rust.* attrs.
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rustc = args.rustc or {};
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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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# https://source.denx.de/u-boot/u-boot/-/blob/9bfb567e5f1bfe7de8eb41f8c6d00f49d2b9a426/common/image.c#L81-106
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ubootArch =
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if final.isx86_32 then "x86" # not i386
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else if final.isMips64 then "mips64" # uboot *does* distinguish between mips32/mips64
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else final.linuxArch; # other cases appear to agree with linuxArch
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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.isMips64n32 then "mipsn32${optionalString final.isLittleEndian "el"}"
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else if final.isMips64 then "mips64${optionalString final.isLittleEndian "el"}"
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else final.uname.processor;
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# Name used by UEFI for architectures.
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efiArch =
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if final.isx86_32 then "ia32"
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else if final.isx86_64 then "x64"
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else if final.isAarch32 then "arm"
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else if final.isAarch64 then "aa64"
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else final.parsed.cpu.name;
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darwinArch = {
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armv7a = "armv7";
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aarch64 = "arm64";
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}.${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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# Remove before 25.05
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androidSdkVersion =
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if (args ? sdkVer && !args ? androidSdkVersion) then
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throw "For android `sdkVer` has been renamed to `androidSdkVersion`"
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else if (args ? androidSdkVersion) then
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args.androidSdkVersion
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else
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null;
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androidNdkVersion =
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if (args ? ndkVer && !args ? androidNdkVersion) then
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throw "For android `ndkVer` has been renamed to `androidNdkVersion`"
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else if (args ? androidSdkVersion) then
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args.androidNdkVersion
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else
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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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wine = (pkgs.winePackagesFor "wine${toString final.parsed.cpu.bits}").minimal;
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in
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# Note: we guarantee that the return value is either `null` or a path
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# to an emulator program. That is, if an emulator requires additional
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# arguments, a wrapper should be used.
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if pkgs.stdenv.hostPlatform.canExecute final
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then "${pkgs.execline}/bin/exec"
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else if final.isWindows
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then "${wine}/bin/wine${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 "${pkgs.qemu-user}/bin/qemu-${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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# whether final.emulator pkgs.pkgsStatic works
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staticEmulatorAvailable = pkgs: final.emulatorAvailable pkgs
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&& (final.isLinux || final.isWasi || final.isMmix);
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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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rust = rust // {
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# Once args.rustc.platform.target-family is deprecated and
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# removed, there will no longer be any need to modify any
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# values from args.rust.platform, so we can drop all the
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# "args ? rust" etc. checks, and merge args.rust.platform in
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# /after/.
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platform = rust.platform or {} // {
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# https://doc.rust-lang.org/reference/conditional-compilation.html#target_arch
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arch =
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/**/ if rust ? platform then rust.platform.arch
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else if final.isAarch32 then "arm"
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else if final.isMips64 then "mips64" # never add "el" suffix
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else if final.isPower64 then "powerpc64" # never add "le" suffix
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else final.parsed.cpu.name;
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# https://doc.rust-lang.org/reference/conditional-compilation.html#target_os
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os =
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/**/ if rust ? platform then rust.platform.os or "none"
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else if final.isDarwin then "macos"
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else if final.isWasm && !final.isWasi then "unknown" # Needed for {wasm32,wasm64}-unknown-unknown.
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else final.parsed.kernel.name;
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# https://doc.rust-lang.org/reference/conditional-compilation.html#target_family
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target-family =
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/**/ if args ? rust.platform.target-family then args.rust.platform.target-family
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else if args ? rustc.platform.target-family
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then
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(
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# Since https://github.com/rust-lang/rust/pull/84072
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# `target-family` is a list instead of single value.
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let
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f = args.rustc.platform.target-family;
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in
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if isList f then f else [ f ]
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)
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else optional final.isUnix "unix"
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++ optional final.isWindows "windows"
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++ optional final.isWasm "wasm";
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# https://doc.rust-lang.org/reference/conditional-compilation.html#target_vendor
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vendor = let
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inherit (final.parsed) vendor;
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in rust.platform.vendor or {
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"w64" = "pc";
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}.${vendor.name} or vendor.name;
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};
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# The name of the rust target, even if it is custom. Adjustments are
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# because rust has slightly different naming conventions than we do.
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rustcTarget = let
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inherit (final.parsed) cpu kernel abi;
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cpu_ = rust.platform.arch or {
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"armv7a" = "armv7";
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"armv7l" = "armv7";
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"armv6l" = "arm";
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"armv5tel" = "armv5te";
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"riscv32" = "riscv32gc";
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"riscv64" = "riscv64gc";
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}.${cpu.name} or cpu.name;
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vendor_ = final.rust.platform.vendor;
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# TODO: deprecate args.rustc in favour of args.rust after 23.05 is EOL.
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in
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args.rust.rustcTarget or
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args.rustc.config or (
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# Rust uses `wasm32-wasip?` rather than `wasm32-unknown-wasi`.
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# We cannot know which subversion does the user want, and
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# currently use WASI 0.1 as default for compatibility. Custom
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# users can set `rust.rustcTarget` to override it.
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if final.isWasi
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then "${cpu_}-wasip1"
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else "${cpu_}-${vendor_}-${kernel.name}${optionalString (abi.name != "unknown") "-${abi.name}"}"
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);
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# The name of the rust target if it is standard, or the json file
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# containing the custom target spec.
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rustcTargetSpec = rust.rustcTargetSpec or (
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/**/ if rust ? platform
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then builtins.toFile (final.rust.rustcTarget + ".json") (toJSON rust.platform)
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else final.rust.rustcTarget);
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# The name of the rust target if it is standard, or the
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# basename of the file containing the custom target spec,
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# without the .json extension.
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#
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# This is the name used by Cargo for target subdirectories.
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cargoShortTarget =
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removeSuffix ".json" (baseNameOf "${final.rust.rustcTargetSpec}");
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# When used as part of an environment variable name, triples are
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# uppercased and have all hyphens replaced by underscores:
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#
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# https://github.com/rust-lang/cargo/pull/9169
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# https://github.com/rust-lang/cargo/issues/8285#issuecomment-634202431
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cargoEnvVarTarget =
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replaceStrings ["-"] ["_"]
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(toUpper final.rust.cargoShortTarget);
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# True if the target is no_std
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# https://github.com/rust-lang/rust/blob/2e44c17c12cec45b6a682b1e53a04ac5b5fcc9d2/src/bootstrap/config.rs#L415-L421
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isNoStdTarget =
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any (t: hasInfix t final.rust.rustcTarget) ["-none" "nvptx" "switch" "-uefi"];
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};
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};
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in assert final.useAndroidPrebuilt -> final.isAndroid;
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assert 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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in
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# Everything in this attrset is the public interface of the file.
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{
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inherit
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architectures
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doubles
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elaborate
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equals
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examples
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flakeExposed
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inspect
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parse
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platforms
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;
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}
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