swiftPackages_ng.swift-minimal: init

Every package in the Swift package set uses the Swift toolchain to
build, but obviously they can’t use a toolchain that includes
themselves. That would result in circular dependencies.

Note: This is a private helper. Packages outside of the Swift package
set should always use the full Swift toolchain when building.

pkgs/top-level/swift-packages.nix

@@ -73,6 +73,10 @@ makeScopeWithSplicing' {
 
       llvmPackages_upstream = llvmPackages;
 
+      swift-minimal = self.swift.override {
+        swift-corelibs-libdispatch = null;
+      };
+
       swift_sources = swift_sources_6_2;
     };
   f = lib.extends autoCalledPackages (self: {