forked from mirrors/nixpkgs
6c9be0bf7a
Commit eef4bbd82f changed the conditional in selectEmulator from
`isCompatible` (which examines only the CPU, rather than the entire
platform) to `canExecute`. This made the first conjunct redundant.
Let's drop the redundant part.
https://github.com/NixOS/nixpkgs/pull/238331#discussion_r1233277119
261 lines
10 KiB
Nix
261 lines
10 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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/*
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Try to convert an elaborated system back to a simple string. If not possible,
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return null. So we have the property:
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sys: _valid_ sys ->
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sys == elaborate (toLosslessStringMaybe sys)
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NOTE: This property is not guaranteed when `sys` was elaborated by a different
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version of Nixpkgs.
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*/
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toLosslessStringMaybe = sys:
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if lib.isString sys then sys
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else if equals sys (elaborate sys.system) then sys.system
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else null;
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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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