pkgsStatic: Finally obviate overlay!

pkgs/stdenv/adapters.nix

···
     });
   });
 
+  # Puts all the other ones together
+  makeStatic = stdenv: lib.foldl (lib.flip lib.id) stdenv (
+    lib.optional stdenv.hostPlatform.isDarwin makeStaticDarwin
+
+    ++ [ makeStaticLibraries propagateBuildInputs ]
+
+    # Apple does not provide a static version of libSystem or crt0.o
+    # So we can’t build static binaries without extensive hacks.
+    ++ lib.optional (!stdenv.hostPlatform.isDarwin) makeStaticBinaries
+
+    # Glibc doesn’t come with static runtimes by default.
+    # ++ lib.optional (stdenv.hostPlatform.libc == "glibc") ((lib.flip overrideInStdenv) [ self.stdenv.glibc.static ])
+  );
+
 
   /* Modify a stdenv so that all buildInputs are implicitly propagated to
      consuming derivations

pkgs/stdenv/cross/default.nix

···
   })
 
   # Run Packages
-  (buildPackages: {
+  (buildPackages: let
+    adaptStdenv =
+      if crossSystem.isStatic
+      then buildPackages.stdenvAdapters.makeStatic
+      else lib.id;
+  in {
     inherit config;
-    overlays = overlays ++ crossOverlays
-      ++ (if (with crossSystem; isWasm || isRedox) then [(import ../../top-level/static.nix)] else []);
+    overlays = overlays ++ crossOverlays;
     selfBuild = false;
-    stdenv = buildPackages.stdenv.override (old: rec {
+    stdenv = adaptStdenv (buildPackages.stdenv.override (old: rec {
       buildPlatform = localSystem;
       hostPlatform = crossSystem;
       targetPlatform = crossSystem;
···
            # to recognize 64-bit DLLs
         ++ lib.optional (hostPlatform.config == "x86_64-w64-mingw32") buildPackages.file
         ;
-    });
+    }));
   })
 
 ]

pkgs/top-level/stage.nix

···
       overlays = [ (self': super': {
         pkgsStatic = super';
       })] ++ overlays;
-      crossOverlays = [ (import ./static.nix) ];
     } // lib.optionalAttrs stdenv.hostPlatform.isLinux {
       crossSystem = {
         isStatic = true;

pkgs/top-level/static.nix

···
-# Overlay that builds static packages.
-
-# Not all packages will build but support is done on a
-# best effort basic.
-#
-# Note on Darwin/macOS: Apple does not provide a static libc
-# so any attempts at static binaries are going to be very
-# unsupported.
-#
-# Basic things like pkgsStatic.hello should work out of the box. More
-# complicated things will need to be fixed with overrides.
-
-self: super: let
-  inherit (super.stdenvAdapters) makeStaticBinaries
-                                 makeStaticLibraries
-                                 propagateBuildInputs
-                                 makeStaticDarwin;
-  inherit (super.lib) foldl optional flip id composeExtensions;
-
-  staticAdapters =
-    optional super.stdenv.hostPlatform.isDarwin makeStaticDarwin
-
-    ++ [ makeStaticLibraries propagateBuildInputs ]
-
-    # Apple does not provide a static version of libSystem or crt0.o
-    # So we can’t build static binaries without extensive hacks.
-    ++ optional (!super.stdenv.hostPlatform.isDarwin) makeStaticBinaries
-
-    # Glibc doesn’t come with static runtimes by default.
-    # ++ optional (super.stdenv.hostPlatform.libc == "glibc") ((flip overrideInStdenv) [ self.stdenv.glibc.static ])
-  ;
-
-in {
-  # Do not add new packages here! Instead use `stdenv.hostPlatform.isStatic` to
-  # write conditional code in the original package.
-
-  stdenv = foldl (flip id) super.stdenv staticAdapters;
-}