dotnet: fix cross compilation

pkgs/development/compilers/dotnet/build-dotnet.nix

@@ -4,12 +4,14 @@
 , icu #passing icu as an argument, because dotnet 3.1 has troubles with icu71
 }:
 
-assert builtins.elem type [ "aspnetcore" "runtime" "sdk"];
+assert builtins.elem type [ "aspnetcore" "runtime" "sdk" ];
 
 { lib
 , stdenv
 , fetchurl
 , writeText
+, autoPatchelfHook
+, makeWrapper
 , libunwind
 , openssl
 , libuuid
@@ -19,19 +21,21 @@ assert builtins.elem type [ "aspnetcore" "runtime" "sdk"];
 }:
 
 let
-  pname = if type == "aspnetcore" then
-    "aspnetcore-runtime"
-  else if type == "runtime" then
-    "dotnet-runtime"
-  else
-    "dotnet-sdk";
+  pname =
+    if type == "aspnetcore" then
+      "aspnetcore-runtime"
+    else if type == "runtime" then
+      "dotnet-runtime"
+    else
+      "dotnet-sdk";
 
   descriptions = {
     aspnetcore = "ASP.NET Core Runtime ${version}";
     runtime = ".NET Runtime ${version}";
     sdk = ".NET SDK ${version}";
   };
-in stdenv.mkDerivation rec {
+in
+stdenv.mkDerivation rec {
   inherit pname version;
 
   # Some of these dependencies are `dlopen()`ed.
@@ -47,8 +51,19 @@ in stdenv.mkDerivation rec {
     lttng-ust_2_12
   ]);
 
-  src = fetchurl (srcs."${stdenv.hostPlatform.system}" or (throw
-    "Missing source (url and hash) for host system: ${stdenv.hostPlatform.system}"));
+  nativeBuildInputs = [
+    autoPatchelfHook
+    makeWrapper
+  ];
+
+  buildInputs = [
+    stdenv.cc.cc
+  ];
+
+  src = fetchurl (
+    srcs."${stdenv.hostPlatform.system}" or (throw
+      "Missing source (url and hash) for host system: ${stdenv.hostPlatform.system}")
+  );
 
   sourceRoot = ".";
 
@@ -68,10 +83,16 @@ in stdenv.mkDerivation rec {
     patchelf --set-rpath "${rpath}" $out/dotnet
     find $out -type f -name "*.so" -exec patchelf --set-rpath '$ORIGIN:${rpath}' {} \;
     find $out -type f \( -name "apphost" -or -name "createdump" \) -exec patchelf --set-interpreter "${stdenv.cc.bintools.dynamicLinker}" --set-rpath '$ORIGIN:${rpath}' {} \;
+
+    wrapProgram $out/bin/dotnet \
+      --prefix LD_LIBRARY_PATH : ${icu}/lib
   '';
 
   doInstallCheck = true;
   installCheckPhase = ''
+    # Fixes cross
+    export DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=1
+
     $out/bin/dotnet --info
   '';
 
@@ -85,6 +106,10 @@ in stdenv.mkDerivation rec {
     export DOTNET_CLI_TELEMETRY_OPTOUT=1
   '';
 
+  passthru = {
+    inherit icu;
+  };
+
   meta = with lib; {
     description = builtins.getAttr type descriptions;
     homepage = "https://dotnet.github.io/";