Add CI step for checking each icrate feature separately

.github/workflows/ci.yml

@@ -282,6 +282,30 @@ jobs:
     - name: Verify that no files changed
       run: git diff --exit-code --submodule=diff
 
+  check-icrate-features:
+    name: Check icrate features
+    runs-on: macos-12
+    needs:
+    - fmt
+    - lint
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+
+    - name: Use system Rust
+      run: cargo --version
+
+    - name: Cache Cargo
+      uses: actions/cache@v3
+      with:
+        path: ${{ env.CARGO_CACHE_PATH }}
+        key: cargo-${{ github.job }}-${{ matrix.name }}-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Check `icrate` with each feature enabled separately
+      run: cargo run --bin=check_icrate_features --features=run-icrate-check
+
   test-macos:
     name: Test macOS 12
     runs-on: macos-12

crates/header-translator/Cargo.toml

@@ -17,6 +17,10 @@ run = [
     "tracing-subscriber",
     "tracing-tree",
 ]
+run-icrate-check = [
+    "toml",
+    "serde",
+]
 
 [dependencies]
 clang = { version = "2.0", features = ["runtime", "clang_10_0"], optional = true }
@@ -31,3 +35,7 @@ proc-macro2 = "1.0.49"
 [[bin]]
 name = "header-translator"
 required-features = ["run"]
+
+[[bin]]
+name = "check_icrate_features"
+required-features = ["run-icrate-check"]

crates/header-translator/src/bin/check_icrate_features.rs

@@ -0,0 +1,48 @@
+use std::collections::BTreeMap;
+use std::error::Error;
+use std::fs;
+use std::path::Path;
+use std::process::Command;
+
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug, Clone, PartialEq, Eq)]
+struct CargoToml {
+    features: BTreeMap<String, Vec<String>>,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
+    let crates_dir = manifest_dir.parent().unwrap();
+    let cargo_toml = fs::read_to_string(crates_dir.join("icrate").join("Cargo.toml"))?;
+
+    let CargoToml { features } = toml::from_str(&cargo_toml)?;
+
+    println!("Testing all Foundation features in `icrate`");
+
+    for feature in features.keys() {
+        if feature.contains("gnustep") {
+            // Skip GNUStep-related features
+            continue;
+        }
+        if feature.contains("_all") || feature.contains("unstable-frameworks-") {
+            // Skip "_all" features for now
+            continue;
+        }
+        if !feature.contains("Foundation") {
+            // Skip all other than "Foundation" features for now
+            continue;
+        }
+
+        println!("Testing {feature:?}");
+
+        let status = Command::new("cargo")
+            .args(["check", "--package=icrate", "--features=Foundation", "--features", feature])
+            .current_dir(crates_dir)
+            .status()?;
+
+        assert!(status.success(), "failed running cargo check");
+    }
+
+    Ok(())
+}