Add riscv64 cross compilation to bsc-ci and hydra

flake.nix

@@ -17,7 +17,7 @@
       legacyPackages.${system} = pkgs;
 
       hydraJobs = {
-        inherit (self.legacyPackages.${system}.bsc-ci) test pkgs;
+        inherit (self.legacyPackages.${system}.bsc-ci) test pkgs cross;
       };
 
       # propagate nixpkgs lib, so we can do bscpkgs.lib

overlay.nix

@@ -96,6 +96,10 @@ in bscPkgs // {
     tests = final.runCommand "ci-tests" { }
       "printf '%s\n' ${toString (collect isDerivation final.bsc-ci.test)} > $out";
 
+    cross = prev.lib.genAttrs [ "riscv64" ] (target:
+      final.pkgsCross.${target}.bsc-ci.pkgs
+    );
+
     all = final.runCommand "ci-all" { }
     ''
       deps="${toString [ final.bsc-ci.pkgsList final.bsc-ci.tests ]}"

pkgs/llvm-ompss2/clang.nix

@@ -43,20 +43,22 @@ let
 
   source = if (useGit) then git else release;
 
-in stdenv.mkDerivation rec {
+in stdenv.mkDerivation {
   pname = "clang-ompss2";
   inherit (source) src version;
 
   enableParallelBuilding = true;
-  isClang = true;
 
   passthru = {
     CC = "clang";
     CXX = "clang++";
-  };
 
+    isClang = true;
     isClangWithOmpss = true;
 
+    inherit gcc zlib;
+  };
+
   nativeBuildInputs = [
     bash
     cmake