Fix caching of rust, make sure we send system out/system err correctly, disable macos x86

Author: slinkydeveloper

.github/workflows/native.yaml

@@ -39,11 +39,12 @@ jobs:
             runner: ubuntu-latest
             cross: true
             rustflags: "-C target-feature=-crt-static"
-          # macOS runners are expensive; comment out the two darwin targets to disable them.
-          - target: x86_64-apple-darwin
-            runner: macos-13
-            cross: false
-            rustflags: ""
+          # macOS runners are expensive; comment out the darwin targets to disable them.
+          # x86_64 darwin disabled for now — re-enable if Intel Mac support is needed.
+          # - target: x86_64-apple-darwin
+          #   runner: macos-13
+          #   cross: false
+          #   rustflags: ""
           - target: aarch64-apple-darwin
             runner: macos-14
             cross: false

.github/workflows/tests.yml

@@ -30,6 +30,10 @@ jobs:
 
       - name: Install Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          # This action bundles Swatinem/rust-cache; point it at the crate's subdirectory (the
+          # default targets the repo root and misses it), so the cdylib build is cached across runs.
+          cache-workspaces: sdk-core/src/main/rust
 
       - name: Pull Restate docker image
         run: docker pull ghcr.io/restatedev/restate:main
@@ -59,6 +63,10 @@ jobs:
         uses: gradle/actions/setup-gradle@v4
       - name: Install Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          # This action bundles Swatinem/rust-cache; point it at the crate's subdirectory (the
+          # default targets the repo root and misses it), so the cdylib build is cached across runs.
+          cache-workspaces: sdk-core/src/main/rust
 
       - name: Build Javadocs
         run: gradle :sdk-aggregated-javadocs:javadoc

sdk-core/build.gradle.kts

@@ -56,6 +56,8 @@ val cargoBuild by
       workingDir = rustSrcDir
       environment("SHARED_CORE_HEADER_OUT", generatedHeaderFile.get().asFile.absolutePath)
       commandLine("cargo", "build", "--release", "--target", hostRustTarget)
+      standardOutput = System.out
+      errorOutput = System.err
       inputs.dir("$rustSrcDir/src")
       inputs.file("$rustSrcDir/Cargo.toml")
       inputs.file("$rustSrcDir/build.rs")