Support linking an external build (#11)

* Support linking an external build
DoumanAsh · Oct 19, 2021 · 6c8dfba · 6c8dfba
1 parent 49001f0
commit 6c8dfba
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diff --git a/README.md b/README.md
@@ -8,6 +8,11 @@ Bindings to [libopus](https://github.com/xiph/opus)
 
 Target version [1.3.1](https://github.com/xiph/opus/releases/tag/v1.3.1)
 
+## Setup
+
+If the `OPUS_LIB_DIR` environment variable is set, it will be searched for the opus
+library. Otherwise, a static library will be built automatically.
+
 ## Android build
 
 When building for android, library requires presence of env variable `ANDROID_NDK_HOME` in order to supply

diff --git a/build.rs b/build.rs
@@ -140,7 +140,14 @@ fn build() {
 fn run() {
     generate_lib();
 
-    build();
+    println!("cargo:rerun-if-env-changed=OPUS_LIB_DIR");
+    if let Ok(dir) = std::env::var("OPUS_LIB_DIR") {
+        assert!(std::path::Path::new(&dir).exists(), "OPUS_LIB_DIR ({}) does not exist!", dir);
+        println!("cargo:rustc-link-search={}", dir);
+        println!("cargo:rustc-link-lib=opus");
+    } else {
+        build();
+    }
 }
 
 fn main() {