3 files changed, 7 insertions, 2 deletions
diff --git a/pkgs/development/compilers/llvm/12/clang/default.nix b/pkgs/development/compilers/llvm/12/clang/default.nix
index 0f1e160bbce82..5329f0d4b659a 100644
--- a/pkgs/development/compilers/llvm/12/clang/default.nix
+++ b/pkgs/development/compilers/llvm/12/clang/default.nix
@@ -107,6 +107,7 @@ let
         of tools that can be built using the Clang frontend as a library to
         parse C/C++ code.
       '';
+      mainProgram = "clang";
     };
   } // lib.optionalAttrs enableManpages {
     pname = "clang-manpages";
diff --git a/pkgs/development/compilers/llvm/12/default.nix b/pkgs/development/compilers/llvm/12/default.nix
index 22c114ab4290a..132a98b9d7694 100644
--- a/pkgs/development/compilers/llvm/12/default.nix
+++ b/pkgs/development/compilers/llvm/12/default.nix
@@ -3,6 +3,7 @@
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
+, targetLlvm
 # This is the default binutils, but with *this* version of LLD rather
 # than the default LLVM verion's, if LLD is the choice. We use these for
 # the `useLLVM` bootstrapping below.
@@ -267,7 +268,7 @@ let
     };
 
     openmp = callPackage ./openmp {
-      inherit llvm_meta;
+      inherit llvm_meta targetLlvm;
     };
   });
 
diff --git a/pkgs/development/compilers/llvm/12/openmp/default.nix b/pkgs/development/compilers/llvm/12/openmp/default.nix
index 8ed1bf71f0081..e0bcf03e00e3a 100644
--- a/pkgs/development/compilers/llvm/12/openmp/default.nix
+++ b/pkgs/development/compilers/llvm/12/openmp/default.nix
@@ -4,6 +4,7 @@
 , fetch
 , cmake
 , llvm
+, targetLlvm
 , perl
 , version
 }:
@@ -15,7 +16,9 @@ stdenv.mkDerivation rec {
   src = fetch pname "14dh0r6h2xh747ffgnsl4z08h0ri04azi9vf79cbz7ma1r27kzk0";
 
   nativeBuildInputs = [ cmake perl ];
-  buildInputs = [ llvm ];
+  buildInputs = [
+    (if stdenv.buildPlatform == stdenv.hostPlatform then llvm else targetLlvm)
+  ];
 
   meta = llvm_meta // {
     homepage = "https://openmp.llvm.org/";