darwin bootstrapping: Avoid overriding aliases for LLVM

Respect the fix points and aliases by overriding originals.

pkgs/development/compilers/llvm/3.7/default.nix

@@ -16,7 +16,7 @@ let
   compiler-rt_src = fetch "compiler-rt" "10c1mz2q4bdq9bqfgr3dirc6hz1h3sq8573srd5q5lr7m7j6jiwx";
   clang-tools-extra_src = fetch "clang-tools-extra" "0sxw2l3q5msbrwxv1ck72arggdw6n5ysi929gi69ikniranfv4aa";
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv isl version fetch; });
   in {
     llvm = callPackage ./llvm.nix {
@@ -41,9 +41,9 @@ let
     };
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv isl version fetch; });
   in {
 
@@ -54,6 +54,6 @@ let
     libcxx = callPackage ./libc++ {};
 
     libcxxabi = callPackage ./libc++abi.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/3.8/default.nix

@@ -15,7 +15,7 @@ let
   compiler-rt_src = fetch "compiler-rt" "0p0y85c7izndbpg2l816z7z7558axq11d5pwkm4h11sdw7d13w0d";
   clang-tools-extra_src = fetch "clang-tools-extra" "15n39r4ssphpaq4a0wzyjm7ilwxb0bch6nrapy8c5s8d49h5qjk6";
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv isl version fetch; });
  in {
     llvm = callPackage ./llvm.nix {
@@ -41,9 +41,9 @@ let
     };
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv isl version fetch; });
   in {
 
@@ -54,6 +54,6 @@ let
     libcxx = callPackage ./libc++ {};
 
     libcxxabi = callPackage ./libc++abi.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/3.9/default.nix

@@ -15,7 +15,7 @@ let
   compiler-rt_src = fetch "compiler-rt" "16gc2gdmp5c800qvydrdhsp0bzb97s8wrakl6i8a4lgslnqnf2fk";
   clang-tools-extra_src = fetch "clang-tools-extra" "0d9nh7j7brbh9avigcn69dlaihsl9p3cf9s45mw6fxzzvrdvd999";
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv isl version fetch; });
   in {
     llvm = callPackage ./llvm.nix {
@@ -41,9 +41,9 @@ let
     };
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv isl version fetch; });
   in {
 
@@ -54,6 +54,6 @@ let
     libcxx = callPackage ./libc++ {};
 
     libcxxabi = callPackage ./libc++abi.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/4/default.nix

@@ -22,7 +22,7 @@ let
     let drv-manpages = drv.override { enableManpages = true; }; in
     drv // { man = drv-manpages.out; /*outputs = drv.outputs ++ ["man"];*/ };
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -52,9 +52,9 @@ let
     lld = callPackage ./lld.nix {};
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -67,6 +67,6 @@ let
     libcxxabi = callPackage ./libc++abi.nix {};
 
     openmp = callPackage ./openmp.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/5/default.nix

@@ -22,7 +22,7 @@ let
     let drv-manpages = drv.override { enableManpages = true; }; in
     drv // { man = drv-manpages.out; /*outputs = drv.outputs ++ ["man"];*/ };
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -53,9 +53,9 @@ let
     lld = callPackage ./lld.nix {};
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -68,6 +68,6 @@ let
     libcxxabi = callPackage ./libc++abi.nix {};
 
     openmp = callPackage ./openmp.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/6/default.nix

@@ -21,7 +21,7 @@ let
     let drv-manpages = drv.override { enableManpages = true; }; in
     drv // { man = drv-manpages.out; /*outputs = drv.outputs ++ ["man"];*/ };
 
-  tools = let
+  tools = stdenv.lib.makeExtensible (tools: let
     callPackage = newScope (tools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -71,9 +71,9 @@ let
     lld = callPackage ./lld.nix {};
 
     lldb = callPackage ./lldb.nix {};
-  };
+  });
 
-  libraries = let
+  libraries = stdenv.lib.makeExtensible (libraries: let
     callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python2 isl release_version version fetch; });
   in {
 
@@ -88,6 +88,6 @@ let
     libcxxabi = callPackage ./libc++abi.nix {};
 
     openmp = callPackage ./openmp.nix {};
-  };
+  });
 
 in { inherit tools libraries; } // libraries // tools