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https://github.com/NixOS/nixpkgs.git
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9c8fd41224
You can use stdenv.hostPlatform.emulator to get an executable that runs cross-built binaries. This could be any emulator. For instance, we use QEMU to emulate Linux targets and Wine to emulate Windows targets. To work with qemu, we need to support custom targets. I’ve reworked the cross tests in pkgs/test/cross to use this functionality. Also, I’ve used talloc to cross-execute with the emulator. There appears to be a cross-execute for all waf builds. In the future, it would be nice to set this for all waf builds. Adds stdenv.hostPlatform.qemuArch attrbute to get the qemuArch for each platform.
121 lines
4.3 KiB
Nix
121 lines
4.3 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.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.isAvr then "avrlibc"
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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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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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}.${final.parsed.kernel.name} or null;
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# uname -p
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processor = final.parsed.cpu.name;
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# uname -r
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release = null;
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};
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qemuArch =
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if final.isArm then "arm"
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else if final.isx86_64 then "x86_64"
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else if final.isx86 then "i386"
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else {
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"powerpc" = "ppc";
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"powerpc64" = "ppc64";
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"powerpc64le" = "ppc64";
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"mips64" = "mips";
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"mipsel64" = "mipsel";
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}.${final.parsed.cpu.name} or final.parsed.cpu.name;
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emulator = pkgs: 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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hostCpuTargets = ["${final.qemuArch}-linux-user"];
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};
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wine-name = "wine${toString final.parsed.cpu.bits}";
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wine = (pkgs.winePackagesFor wine-name).minimal;
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in
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if final.parsed.kernel.name == pkgs.stdenv.hostPlatform.parsed.kernel.name &&
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(final.parsed.cpu.name == pkgs.stdenv.hostPlatform.parsed.cpu.name ||
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(final.platform.isi686 && pkgs.stdenv.hostPlatform.isx86_64))
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then pkgs.runtimeShell
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else if final.isWindows
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then "${wine}/bin/${wine-name}"
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else if final.isLinux && pkgs.stdenv.hostPlatform.isLinux
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then "${qemu-user}/bin/qemu-${final.qemuArch}"
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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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// 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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