treewide: remove enableParallelBuilding = true if using cmake

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

@@ -72,8 +72,6 @@ let
       rm $out/bin/c-index-test
     '';
 
-    enableParallelBuilding = true;
-
     passthru = {
       isClang = true;
       inherit llvm;

pkgs/development/compilers/llvm/6/compiler-rt.nix

@@ -86,5 +86,4 @@ stdenv.mkDerivation {
     ln -s $out/lib/*/clang_rt.crtend_shared-*.o $out/lib/linux/crtendS.o
   '';
 
-  enableParallelBuilding = true;
 }

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

@@ -37,8 +37,6 @@ stdenv.mkDerivation {
     "-DLIBCXX_CXX_ABI=libcxxabi"
   ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1";
 
-  enableParallelBuilding = true;
-
   passthru = {
     isLLVM = true;
   };

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

@@ -17,8 +17,6 @@ stdenv.mkDerivation {
 
   outputs = [ "out" "dev" ];
 
-  enableParallelBuilding = true;
-
   postInstall = ''
     moveToOutput include "$dev"
     moveToOutput lib "$dev"

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

@@ -51,8 +51,6 @@ stdenv.mkDerivation {
     "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
   ];
 
-  enableParallelBuilding = true;
-
   postInstall = ''
     mkdir -p $out/share/man/man1
     cp ../docs/lldb.1 $out/share/man/man1/

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

@@ -145,8 +145,6 @@ stdenv.mkDerivation ({
 
   checkTarget = "check-all";
 
-  enableParallelBuilding = true;
-
   requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";

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

@@ -15,8 +15,6 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake perl ];
   buildInputs = [ llvm ];
 
-  enableParallelBuilding = true;
-
   meta = {
     description = "Components required to build an executable OpenMP program";
     homepage    = "https://openmp.llvm.org/";