enable dlopen feature with env var RUST_JACK_DLOPEN

build.rs

@@ -0,0 +1,7 @@
+fn main() {
+ println!("cargo:rerun-if-env-changed=RUST_JACK_DLOPEN");
+ let dlopen = std::env::var("RUST_JACK_DLOPEN").is_ok();
+ if dlopen {
+ println!("cargo:rustc-cfg=feature=\"dlopen\"");
+ }
+}

jack-sys/build.rs

@@ -1,8 +1,14 @@
 fn main() {
- // pkg-config is required to find PipeWire's implementation of libjack
- // Refer to https://github.com/RustAudio/rust-jack/issues/142 for details.
- // Do not unwrap this because linking might still work if pkg-config is
- // not installed, for example on Windows.
- #[cfg(not(feature = "dlopen"))]
- let _ = pkg_config::probe_library("jack");
+ println!("cargo:rerun-if-env-changed=RUST_JACK_DLOPEN");
+ let dlopen = std::env::var("RUST_JACK_DLOPEN").is_ok();
+ if dlopen {
+ println!("cargo:rustc-cfg=feature=\"dlopen\"");
+ }
+ if !(dlopen || cfg!(feature = "dlopen")) {
+ // pkg-config is required to find PipeWire's implementation of libjack
+ // Refer to https://github.com/RustAudio/rust-jack/issues/142 for details.
+ // Do not unwrap this because linking might still work if pkg-config is
+ // not installed, for example on Windows.
+ pkg_config::find_library("jack").unwrap();
+ }
 }

src/lib.rs

@@ -32,6 +32,10 @@
 //! jack = { version = "0.9", default-features = false }
 //! ```
 //!
+//! You can set the environment variable `RUST_JACK_DLOPEN` to `on` to enable the `dlopen` feature
+//! without needing to edit your application's Cargo.toml. This can be useful for cross compiling
+//! to Linux with a different CPU architecture.
+//!
 //! # Server
 //!
 //! JACK provides a high priority server to manipulate audio and midi across applications. The rust