Add llvm compiler-nix-names (#2106)

* Add llvm compiler-nix-names

* ifdLevel 1

* Disable llvm for windows and ghcjs

GHCJS makes no sense to be built with LLVM,
and Windows doesn't work with LLVM apparently generating invalid assembly.

* ifdLevel 2

* Add materialized iserv-proxy files for llvm compilers

* Disable more llvm builds for windows, a bit more explicitly.

* ifdLevel 3

* Add materialized files

* More materialized files

* ifdLevel 1

* ifdLevel 2

* ifdLevel 3

* Add `-llvm` to ghc derivation name

* Add `-llvm` to ghc derivation name

* ifdLevel 2

* ifdLevel 3

* Disable dwarf test for llvm compilers

---------

Co-authored-by: Moritz Angermann <[email protected]>

ci.nix

@@ -68,7 +68,9 @@
         ghc92 = true;
         ghc94 = true;
         ghc96 = true;
+        ghc96llvm = true;
         ghc98 = true;
+        ghc98llvm = true;
         ghc98X = true;
         ghc99 = true;
       })));
@@ -77,17 +79,20 @@
     # of 'lib.systems.examples' are not understood between all versions
     let lib = nixpkgs.lib;
     in lib.optionalAttrs (nixpkgsName == "unstable"
+      && (__match ".*llvm" compiler-nix-name == null)
       && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc884" "ghc902" "ghc928" "ghc948"])
        || (system == "aarch64-linux" && !builtins.elem compiler-nix-name ["ghc884" "ghc902" "ghc928" "ghc948"])
        || (system == "x86_64-darwin" && !builtins.elem compiler-nix-name ["ghc884" "ghc902" "ghc928" "ghc948"])
        || (system == "aarch64-darwin" && !builtins.elem compiler-nix-name ["ghc884" "ghc902" "ghc928" "ghc948"])
        )) {
     inherit (lib.systems.examples) ghcjs;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
+      && (__match ".*llvm" compiler-nix-name == null)
       && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc884"])
        || (system == "x86_64-darwin" && builtins.elem compiler-nix-name []))) { # TODO add ghc versions when we have more darwin build capacity
     inherit (lib.systems.examples) mingwW64;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
+      && (__match ".*llvm" compiler-nix-name == null)
       && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc884" "ghc8107" "ghc902" "ghc928"])
        || (system == "x86_64-darwin" && builtins.elem compiler-nix-name []))) { # TODO add ghc versions when we have more darwin build capacity
     inherit (lib.systems.examples) ucrt64;

compiler/ghc/default.nix

@@ -354,7 +354,7 @@ let
 in
 stdenv.mkDerivation (rec {
   version = ghc-version;
-  name = "${targetPrefix}ghc-${version}";
+  name = "${targetPrefix}ghc-${version}" + lib.optionalString (useLLVM) "-llvm";
 
   inherit src configureFlags;
   patches = ghc-patches;