[c#] Enable running the C# tests on linux (#1200)

* Enable running the Csharp tests on linux

Signed-off-by: James Sturtevant <jstur@microsoft.com>

* fix ci

Signed-off-by: James Sturtevant <jstur@microsoft.com>

* We don't have native aot packages for macos avaliable

Signed-off-by: James Sturtevant <jstur@microsoft.com>

* Don't silently pass on macOS

Instead just don't test on macos

* Different github actions syntax

---------

Signed-off-by: James Sturtevant <jstur@microsoft.com>
Co-authored-by: Alex Crichton <alex@alexcrichton.com>

Author: jsturtevant

.github/workflows/main.yml

@@ -60,6 +60,10 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         # moonbit removed from language matrix for now - causing CI failures
         lang: [c, rust, teavm-java, go, csharp]
+        exclude:
+          # For now csharp doesn't work on macos, so exclude it from testing.
+          - os: macos-latest
+            lang: csharp
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
@@ -73,7 +77,7 @@ jobs:
       if: matrix.lang == 'rust'
 
     - uses: ./.github/actions/install-wasi-sdk
-      if: matrix.lang == 'c' || (matrix.lang == 'csharp' && matrix.os == 'windows-latest')
+      if: matrix.lang == 'c' || matrix.lang == 'csharp'
 
     - name: Setup .NET
       uses: actions/setup-dotnet@v4

crates/csharp/src/csproj.rs

@@ -91,13 +91,20 @@ impl CSProjectLLVMBuilder {
         );
 
         if self.aot {
+            let os = match std::env::consts::OS {
+                "windows" => "win",
+                "linux" => std::env::consts::OS,
+                other => todo!("OS {} not supported", other),
+            };
+
             csproj.push_str(
-                r#"
+                &format!(
+                    r#"
                 <ItemGroup>
                     <PackageReference Include="Microsoft.DotNet.ILCompiler.LLVM" Version="10.0.0-*" />
-                    <PackageReference Include="runtime.win-x64.Microsoft.DotNet.ILCompiler.LLVM" Version="10.0.0-*" />
+                    <PackageReference Include="runtime.{os}-x64.Microsoft.DotNet.ILCompiler.LLVM" Version="10.0.0-*" />
                 </ItemGroup>
-                "#,
+                "#),
             );
 
             fs::write(

tests/runtime/main.rs

@@ -659,7 +659,7 @@ fn tests(name: &str, dir_name: &str) -> Result<Vec<PathBuf>> {
     }
 
     #[cfg(feature = "csharp")]
-    if cfg!(windows) && !c_sharp.is_empty() {
+    if !c_sharp.is_empty() {
         let (resolve, world) = resolve_wit_dir(&dir);
         for path in c_sharp.iter() {
             let world_name = &resolve.worlds[world].name;