lib.systems: add uefi support (#477645)

lib/systems/doubles.nix

@@ -109,6 +109,10 @@ let
     "aarch64-windows"
     "x86_64-windows"
     "i686-windows"
+
+    # UEFI
+    "aarch64-uefi"
+    "x86_64-uefi"
   ];
 
   allParsed = map parse.mkSystemFromString all;
@@ -189,6 +193,7 @@ in
   redox = filterDoubles predicates.isRedox;
   windows = filterDoubles predicates.isWindows;
   genode = filterDoubles predicates.isGenode;
+  uefi = filterDoubles predicates.isUefi;
 
   embedded = filterDoubles predicates.isNone;
 }

lib/systems/examples.nix

@@ -337,6 +337,24 @@ rec {
     platform = { };
   };
 
+  #
+  # UEFI
+  #
+
+  x86_64-unknown-uefi = {
+    config = "x86_64-unknown-uefi";
+    libc = null;
+    useLLVM = true;
+    linker = "lld";
+  };
+
+  aarch64-unknown-uefi = {
+    config = "aarch64-unknown-uefi";
+    libc = null;
+    useLLVM = true;
+    linker = "lld";
+  };
+
   #
   # Windows
   #

lib/systems/inspect.nix

@@ -431,6 +431,10 @@ rec {
       }
     ];
 
+    isUefi = [
+      { kernel = kernels.uefi; }
+    ];
+
     isElf = {
       kernel.execFormat = execFormats.elf;
     };

lib/systems/parse.nix

@@ -634,6 +634,10 @@ rec {
         execFormat = unknown;
         families = { };
       };
+      uefi = {
+        execFormat = pe;
+        families = { };
+      };
     }
     // {
       # aliases
@@ -849,6 +853,7 @@ rec {
             "mmixware"
             "ghcjs"
             "mingw32"
+            "uefi"
           ]
           || hasPrefix "freebsd" (elemAt l 2)
           || hasPrefix "netbsd" (elemAt l 2)

lib/tests/systems.nix

@@ -55,6 +55,7 @@ lib.runTests (
       ++ js
       ++ genode
       ++ redox
+      ++ uefi
     );
 
     testarm = mseteq arm [
@@ -136,6 +137,7 @@ lib.runTests (
       "x86_64-solaris"
       "x86_64-windows"
       "x86_64-none"
+      "x86_64-uefi"
     ];
 
     testcygwin = mseteq cygwin [