Add option to build rust api without linking to core

Author: negasora

rust/Cargo.toml

@@ -12,6 +12,9 @@ no_exports = []
 # Add this if you want to support the demo version of the product.
 # This will disable certain functions that do not exist in the demo build.
 demo = ["no_exports"]
+# Add this to build without linking to binaryninjacore.
+# This option is only for shared libraries that will later be loaded in the same process as binaryninjacore.
+no_core = []
 
 [dependencies]
 log = { version = "0.4", features = ["std"] }

rust/build.rs

@@ -1,21 +1,23 @@
 use std::path::PathBuf;
 
 fn main() {
-    let link_path =
-        std::env::var_os("DEP_BINARYNINJACORE_PATH").expect("DEP_BINARYNINJACORE_PATH specified");
+    if std::env::var("CARGO_FEATURE_NO_CORE").is_err() {
+        let link_path = std::env::var_os("DEP_BINARYNINJACORE_PATH")
+            .expect("DEP_BINARYNINJACORE_PATH not specified");
 
-    println!("cargo::rustc-link-lib=dylib=binaryninjacore");
-    println!("cargo::rustc-link-search={}", link_path.to_str().unwrap());
+        println!("cargo::rustc-link-lib=dylib=binaryninjacore");
+        println!("cargo::rustc-link-search={}", link_path.to_str().unwrap());
 
-    #[cfg(not(target_os = "windows"))]
-    {
-        println!(
-            "cargo::rustc-link-arg=-Wl,-rpath,{0},-L{0}",
-            link_path.to_string_lossy()
-        );
+        #[cfg(not(target_os = "windows"))]
+        {
+            println!(
+                "cargo::rustc-link-arg=-Wl,-rpath,{0},-L{0}",
+                link_path.to_string_lossy()
+            );
+        }
     }
 
-    let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR specified");
+    let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR not specified");
     let out_dir_path = PathBuf::from(out_dir);
 
     // Copy all binaries to OUT_DIR for unit tests.