ldc: wrap ldc2 binary with C compiler because it's needed for linking

pkgs/development/compilers/ldc/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchgit, fetchurl, cmake, llvm, curl, tzdata
 , python, libconfig, lit, gdb, unzip, darwin, bash
-, callPackage
+, callPackage, makeWrapper, targetPackages
 , bootstrapVersion ? false
 , version ? "1.8.0"
 , ldcSha256 ? "0zswjlibj8zcdj06nn09jjhbd99chsa5f4kps8xifzgrpgsa28g4"
@@ -124,7 +124,7 @@ let
             --replace "tzName == \"+VERSION\"" "baseName(tzName) == \"leapseconds\" || tzName == \"+VERSION\""
     '';
 
-    nativeBuildInputs = [ cmake llvm bootstrapLdc python lit gdb unzip ]
+    nativeBuildInputs = [ cmake makeWrapper llvm bootstrapLdc python lit gdb unzip ]
 
     ++ stdenv.lib.optional (bootstrapVersion) [
       libconfig
@@ -135,7 +135,7 @@ let
     ]);
 
 
-    buildInputs = [ curl tzdata stdenv.cc ];
+    buildInputs = [ curl tzdata ];
 
     preConfigure = ''
       cmakeFlagsArray=("-DINCLUDE_INSTALL_DIR=$out/include/dlang/ldc"
@@ -158,14 +158,20 @@ let
     doCheck = true;
 
     checkPhase = ''
-	# Build and run LDC D unittests.
-	ctest --output-on-failure -R "ldc2-unittest"
-	# Run LIT testsuite.
-	ctest -V -R "lit-tests"
-	# Run DMD testsuite.
-	DMD_TESTSUITE_MAKE_ARGS=-j$NIX_BUILD_CORES ctest -V -R "dmd-testsuite"
+      # Build and run LDC D unittests.
+      ctest --output-on-failure -R "ldc2-unittest"
+      # Run LIT testsuite.
+      ctest -V -R "lit-tests"
+      # Run DMD testsuite.
+      DMD_TESTSUITE_MAKE_ARGS=-j$NIX_BUILD_CORES ctest -V -R "dmd-testsuite"
     '';
 
+    postInstall = ''
+      wrapProgram $out/bin/ldc2 \
+          --prefix PATH ":" "${targetPackages.stdenv.cc}/bin" \
+          --set-default CC "${targetPackages.stdenv.cc}/bin/cc"
+     '';
+
     meta = with stdenv.lib; {
       description = "The LLVM-based D compiler";
       homepage = https://github.com/ldc-developers/ldc;