add optional cmake builds

Cargo.toml

@@ -8,8 +8,12 @@ edition = "2018"
 license = "MIT"
 build = "build.rs"
 
+[features]
+default = ["autotools"]
+
 [dependencies]
 libc = "0.2"
 
 [build-dependencies]
-autotools = "0.2"
+autotools = {version = "0.2", optional = true}
+cmake = {version = "0.1", optional = true}

README.md

@@ -12,6 +12,13 @@ This crate is for use cases in which developers need to integrate [`bdwgc`][bdwg
 
 See [`examples`](examples) directory.
 
+By default [`bdwgc`][bdwgc] is built with autotools. To build with cmake enable the `cmake` feature in `Cargo.toml`:
+
+    [dependencies.bdwgc-alloc]
+    version = "0.4"
+    default-features = false
+    features = ["cmake"]
+
 ## License
 
 [MIT](LICENSE)

build.rs

@@ -1,6 +1,7 @@
 const LIB_ATOMIC_OPS_DIR: &str = "vendor/libatomic_ops";
 const LIB_GC_DIR: &str = "vendor/bdwgc";
 
+#[cfg(feature = "autotools")]
 fn main() {
     for dir in &[LIB_ATOMIC_OPS_DIR, LIB_GC_DIR] {
         std::process::Command::new("sh")
@@ -41,3 +42,29 @@ fn main() {
             .unwrap();
     }
 }
+
+#[cfg(feature = "cmake")]
+fn main() {
+    use cmake::Config;
+    use std::path::Path;
+
+    let libatomic_include_path = Path::new(LIB_ATOMIC_OPS_DIR)
+        .join("src")
+        .canonicalize()
+        .unwrap()
+        .display()
+        .to_string()
+        .replace(r"\\?\", "");
+
+    let dst = Config::new(LIB_GC_DIR)
+        .profile("Release")
+        .define("BUILD_SHARED_LIBS", "FALSE")
+        .cflag(format!("-I{}", libatomic_include_path))
+        .build();
+
+    println!(
+        "cargo:rustc-link-search=native={}",
+        dst.join("lib").display()
+    );
+    println!("cargo:rustc-link-lib=static=gc");
+}