minion: fix linking path errors

solvers/minion/build.rs

@@ -10,10 +10,25 @@ use std::process::Command;
 fn main() {
  println!("cargo:rustc-rerun-if-changed=vendor");
  println!("cargo:rerun-if-changed=build.rs");
+
+ // must be ./ to be recognised as relative path
+ // from project root
+ println!("cargo:rustc-link-search=all=./solvers/minion/vendor/build/");
+ println!("cargo:rustc-link-lib=static=minion");
+
+ // also need to (dynamically) link to c++ stdlib
+ // https://flames-of-code.netlify.app/blog/rust-and-cmake-cplusplus/
+ let target = env::var("TARGET").unwrap();
+ if target.contains("apple") {
+ println!("cargo:rustc-link-lib=dylib=c++");
+ } else if target.contains("linux") {
+ println!("cargo:rustc-link-lib=dylib=stdc++");
+ } else {
+ unimplemented!();
+ }
+
  build();
  bind();
- println!("cargo:rustc-link-lib=libminion");
- println!("cargo:rustc-link-search=vendor/build");
 }
 
 fn build() {