feat: allow load pam library dynamic

Cargo.toml

@@ -11,16 +11,19 @@ repository = "https://github.com/1wilkens/pam-sys.git"
 documentation = "https://docs.rs/pam-sys/"
 readme = "README.md"
 include = [ "LICENSE-*", "README.md", "CHANGELOG.md", "src/lib.rs", "build.rs", "wrapper.h"]
-
 edition = "2018"
+
 build = "build.rs"
-links = "pam"
 
 [badges]
 azure-devops = { project = "1wilkens/ci", pipeline = "pam-sys" }
 
 [dependencies]
 libc = "^0.2.65"
+libloading = { version = "0.8", optional = true }
 
 [build-dependencies]
 bindgen = { version = "0.69", default-features = false }
+
+[features]
+dylib = ["dep:libloading"]

build.rs

@@ -17,7 +17,14 @@ fn main() {
     println!("cargo:rerun-if-changed=wrapper.h");
 
     // Prepare bindgen builder
-    let mut builder = bindgen::Builder::default()
+    let mut builder = bindgen::Builder::default();
+
+    #[cfg(feature = "dylib")]
+    {
+        builder = builder.dynamic_library_name("pam");
+    }
+
+    builder = builder
         // Our header
         .header("wrapper.h")
         // Use libc for c-types