rubyPackages.rbtrace: fix riscv64-linux build (#565242)

pkgs/by-name/gi/gitlab/package.nix

@@ -23,6 +23,9 @@
   rustc,
   rustPlatform,
 
+  # gitlab-glaz
+  buildPackages,
+
   # gpgme
   pkg-config,
 
@@ -67,46 +70,57 @@ let
         buildFlags = [ "--enable-system-libraries" ];
       };
 
-      gitlab-glaz = attrs: {
-        cargoDeps = rustPlatform.fetchCargoVendor {
-          src = stdenv.mkDerivation {
-            inherit (buildRubyGem { inherit (attrs) gemName version source; })
-              name
-              src
-              unpackPhase
-              nativeBuildInputs
-              ;
-            dontBuilt = true;
-            installPhase = ''
-              cp -R ext/glaz $out
-              cp Cargo.lock $out
-            '';
+      gitlab-glaz =
+        attrs:
+        {
+          cargoDeps = rustPlatform.fetchCargoVendor {
+            src = stdenv.mkDerivation {
+              inherit (buildRubyGem { inherit (attrs) gemName version source; })
+                name
+                src
+                unpackPhase
+                nativeBuildInputs
+                ;
+              dontBuilt = true;
+              installPhase = ''
+                cp -R ext/glaz $out
+                cp Cargo.lock $out
+              '';
+            };
+            hash = "sha256-5fGoW6TpkIQ8OIXjt2fLGzG9xhZ2TT+v2zLH1ecItII=";
           };
-          hash = "sha256-5fGoW6TpkIQ8OIXjt2fLGzG9xhZ2TT+v2zLH1ecItII=";
+
+          dontBuild = false;
+
+          nativeBuildInputs = [
+            cargo
+            rustc
+            rustPlatform.cargoSetupHook
+            rustPlatform.bindgenHook
+          ];
+
+          disallowedReferences = [
+            rustc.unwrapped
+          ];
+
+          preInstall = ''
+            export CARGO_HOME="$PWD/../.cargo/"
+          '';
+
+          postInstall = ''
+            find $out -type f -name .rustc_info.json -delete
+          '';
+        }
+        // lib.optionalAttrs stdenv.hostPlatform.isRiscV64 {
+          # protoc-bin-vendored ships no riscv64 protoc
+          postPatch = ''
+            substituteInPlace $cargoDepsCopy/source-*/glaz-proto-*/build.rs \
+              --replace-fail 'protoc_bin_vendored::protoc_bin_path()?' \
+                'std::path::PathBuf::from(std::env::var("PROTOC")?)'
+          '';
+          PROTOC = lib.getExe' buildPackages.protobuf "protoc";
         };
 
-        dontBuild = false;
-
-        nativeBuildInputs = [
-          cargo
-          rustc
-          rustPlatform.cargoSetupHook
-          rustPlatform.bindgenHook
-        ];
-
-        disallowedReferences = [
-          rustc.unwrapped
-        ];
-
-        preInstall = ''
-          export CARGO_HOME="$PWD/../.cargo/"
-        '';
-
-        postInstall = ''
-          find $out -type f -name .rustc_info.json -delete
-        '';
-      };
-
       gitlab-glfm-markdown = attrs: {
         cargoDeps = rustPlatform.fetchCargoVendor {
           src = stdenv.mkDerivation {

pkgs/development/ruby-modules/gem-config/default.nix

@@ -1045,6 +1045,20 @@ in
     buildFlags = [ "--with-ssh" ];
   };
 
+  rbtrace =
+    attrs:
+    # unpack the vendored msgpack so the gnu-config hook can refresh its old config.{guess,sub}
+    lib.optionalAttrs (stdenv.hostPlatform.isRiscV64 || stdenv.hostPlatform.isLoongArch64) {
+      dontBuild = false;
+      postPatch = ''
+        tar -xzf ext/src/msgpack-1.1.0.tar.gz -C ext/src
+      '';
+      preConfigure = ''
+        tar -czf ext/src/msgpack-1.1.0.tar.gz -C ext/src msgpack-1.1.0
+        rm -r ext/src/msgpack-1.1.0
+      '';
+    };
+
   sassc = attrs: {
     nativeBuildInputs = [ rake ];
     dontBuild = false;