systems/examples: add i686 & x86-64 embedded

Fixes #28160

lib/systems/examples.nix

@@ -118,6 +118,16 @@ rec {
     libc = "newlib";
   };
 
+  i686-embedded = {
+    config = "i686-elf";
+    libc = "newlib";
+  };
+
+  x86_64-embedded = {
+    config = "x86_64-elf";
+    libc = "newlib";
+  };
+
   #
   # Darwin
   #

lib/systems/parse.nix

@@ -267,6 +267,8 @@ rec {
         then { cpu = elemAt l 0;                      kernel = "windows";  abi = "cygnus";   }
       else if (elemAt l 1 == "eabi")
         then { cpu = elemAt l 0; vendor = "none"; kernel = "none"; abi = elemAt l 1; }
+      else if (elemAt l 1 == "elf")
+        then { cpu = elemAt l 0; vendor = "none"; kernel = "none"; abi = elemAt l 1; }
       else   { cpu = elemAt l 0;                      kernel = elemAt l 1;                   };
     "3" = # Awkwards hacks, beware!
       if elemAt l 1 == "apple"

pkgs/top-level/release-cross.nix

@@ -144,6 +144,8 @@ in
   arm-embedded = mapTestOnCross lib.systems.examples.arm-embedded embedded;
   powerpc-embedded = mapTestOnCross lib.systems.examples.powerpc-embedded embedded;
   aarch64-embedded = mapTestOnCross lib.systems.examples.aarch64-embedded embedded;
+  i686-embedded = mapTestOnCross lib.systems.examples.i686-embedded embedded;
+  x86_64-embedded = mapTestOnCross lib.systems.examples.x86_64-embedded embedded;
 
   /* Cross-built bootstrap tools for every supported platform */
   bootstrapTools = let