Merge pull request #67920 from Ericson2314/feature/js-unknown-ghcjs

Add support for `js-unknown-ghcjs`

lib/systems/examples.nix

@@ -236,4 +236,9 @@ rec {
     useLLVM = true;
   };
 
+  # Ghcjs
+  ghcjs = {
+    config = "js-unknown-ghcjs";
+    platform = {};
+  };
 }

lib/systems/inspect.nix

@@ -12,7 +12,7 @@ rec {
     isx86_32       = { cpu = { family = "x86"; bits = 32; }; };
     isx86_64       = { cpu = { family = "x86"; bits = 64; }; };
     isPowerPC      = { cpu = cpuTypes.powerpc; };
-    isPower = { cpu = { family = "power"; }; };
+    isPower        = { cpu = { family = "power"; }; };
     isx86          = { cpu = { family = "x86"; }; };
     isAarch32      = { cpu = { family = "arm"; bits = 32; }; };
     isAarch64      = { cpu = { family = "arm"; bits = 64; }; };
@@ -23,6 +23,7 @@ rec {
     isMsp430       = { cpu = { family = "msp430"; }; };
     isAvr          = { cpu = { family = "avr"; }; };
     isAlpha        = { cpu = { family = "alpha"; }; };
+    isJavaScript   = { cpu = cpuTypes.js; };
 
     is32bit        = { cpu = { bits = 32; }; };
     is64bit        = { cpu = { bits = 64; }; };
@@ -45,6 +46,7 @@ rec {
     isMinGW        = { kernel = kernels.windows; abi = abis.gnu; };
     isWasi         = { kernel = kernels.wasi; };
     isNone         = { kernel = kernels.none; };
+    isGhcjs        = { kernel = kernels.ghcjs; };
 
     isAndroid      = [ { abi = abis.android; } { abi = abis.androideabi; } ];
     isMusl         = with abis; map (a: { abi = a; }) [ musl musleabi musleabihf ];

lib/systems/parse.nix

@@ -111,6 +111,8 @@ rec {
 
     msp430   = { bits = 16; significantByte = littleEndian; family = "msp430"; };
     avr      = { bits = 8; family = "avr"; };
+
+    js       = { bits = 32; significantByte = littleEndian; family = "js"; };
   };
 
   # Determine where two CPUs are compatible with each other. That is,
@@ -271,6 +273,7 @@ rec {
     solaris = { execFormat = elf;     families = { }; };
     wasi    = { execFormat = wasm;    families = { }; };
     windows = { execFormat = pe;      families = { }; };
+    ghcjs   = { execFormat = unknown; families = { }; };
   } // { # aliases
     # 'darwin' is the kernel for all of them. We choose macOS by default.
     darwin = kernels.macos;
@@ -384,6 +387,8 @@ rec {
         then { cpu = elemAt l 0; vendor = elemAt l 1;    kernel = elemAt l 2;                }
       else if (elem (elemAt l 2) ["eabi" "eabihf" "elf"])
         then { cpu = elemAt l 0; vendor = "unknown"; kernel = elemAt l 1; abi = elemAt l 2; }
+      else if (elemAt l 2 == "ghcjs")
+        then { cpu = elemAt l 0; vendor = "unknown"; kernel = elemAt l 2; }
       else throw "Target specification with 3 components is ambiguous";
     "4" =    { cpu = elemAt l 0; vendor = elemAt l 1; kernel = elemAt l 2; abi = elemAt l 3; };
   }.${toString (length l)}

pkgs/stdenv/cross/default.nix

@@ -55,6 +55,8 @@ in lib.init bootStages ++ [
              then buildPackages.darwin.iosSdkPkgs.clang
            else if crossSystem.useAndroidPrebuilt or false
              then buildPackages."androidndkPkgs_${crossSystem.ndkVer}".clang
+           else if targetPlatform.isGhcjs
+             then null
            else if crossSystem.useLLVM or false
              then buildPackages.llvmPackages_8.lldClang
            else buildPackages.gcc;

pkgs/top-level/all-packages.nix

@@ -10973,6 +10973,7 @@ in
     else if name == "libSystem" then targetPackages.darwin.xcode
     else if name == "nblibc" then targetPackages.netbsdCross.libc
     else if name == "wasilibc" then targetPackages.wasilibc or wasilibc
+    else if stdenv.targetPlatform.isGhcjs then null
     else throw "Unknown libc ${name}";
 
   libcCross = assert stdenv.targetPlatform != stdenv.buildPlatform; libcCrossChooser stdenv.targetPlatform.libc;