Add feature flags for static builds

.github/workflows/cargo.yml

@@ -44,5 +44,9 @@ jobs:
       run: cargo build --all
     - name: Cargo test
       run: cargo test --all
+    - name: Cargo build with static feature
+      run: cargo build --all --features static
+    - name: Cargo test with static feature
+      run: cargo test --all --features static
     - name: Cargo Publish (dry run)
       run: cargo publish --dry-run --allow-dirty

Cargo.toml

@@ -44,6 +44,10 @@ include = [
     "/THIRD-PARTY-NOTICES",
 ]
 
+[features]
+default = []
+static = []
+
 [build-dependencies]
 cmake = "0.1"
 

scripts/build.rs

@@ -13,13 +13,19 @@ fn main() {
     }
 
     let target = env::var("TARGET").unwrap();
+    let out_dir = env::var("OUT_DIR").unwrap();
+    // The output directory for the native MsQuic library.
+    let quic_output_dir = Path::new(&out_dir).join("lib");
 
     // Builds the native MsQuic and installs it into $OUT_DIR.
     let mut config = Config::new(".");
     config
         .define("QUIC_ENABLE_LOGGING", logging_enabled)
         .define("QUIC_TLS", "openssl")
-        .define("QUIC_OUTPUT_DIR", "../lib");
+        .define("QUIC_OUTPUT_DIR", quic_output_dir.to_str().unwrap());
+    if cfg!(feature = "static") {
+        config.define("QUIC_BUILD_SHARED", "off");
+    }
 
     // macos-latest's cargo automatically specify --target=${ARCH}-apple-macosx14.5
     // which conflicts with -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}.
@@ -38,4 +44,7 @@ fn main() {
     let dst = config.build();
     let lib_path = Path::join(Path::new(&dst), Path::new(path_extra));
     println!("cargo:rustc-link-search=native={}", lib_path.display());
+    if cfg!(feature = "static") {
+        println!("cargo:rustc-link-lib=static=msquic");
+    }
 }