Add init method to force linking

src/lib.rs

@@ -2,6 +2,12 @@
 
 extern crate libc;
 
+/// Call this somewhere to force Rust to link this module.
+/// The call doesn't need to execute, just exist.
+///
+/// See https://github.com/rust-lang/rust/issues/47384
+pub fn init() {}
+
 #[no_mangle]
 extern "C" fn posix_memalign(
     memptr: *mut *mut libc::c_void,