Auto merge of #56397 - petrhosek:file-search, r=cramertj

Search other library paths when loking for link objects

Support the case when link objects are not located in Rust sysroot
but in other locations which could be specify through library paths.

1 files changed, 19 insertions, 5 deletions

diff --git a/src/librustc_codegen_llvm/back/link.rs b/src/librustc_codegen_llvm/back/link.rs
index f1c0464f5f2..55ab0724e94 100644
--- a/src/librustc_codegen_llvm/back/link.rs
+++ b/src/librustc_codegen_llvm/back/link.rs
@@ -457,6 +457,21 @@ fn print_native_static_libs(sess: &Session, all_native_libs: &[NativeLibrary]) {
     }
 }
 
+fn get_file_path(sess: &Session, name: &str) -> PathBuf {
+    let fs = sess.target_filesearch(PathKind::Native);
+    let file_path = fs.get_lib_path().join(name);
+    if file_path.exists() {
+        return file_path
+    }
+    for search_path in fs.search_paths() {
+        let file_path = search_path.dir.join(name);
+        if file_path.exists() {
+            return file_path
+        }
+    }
+    PathBuf::from(name)
+}
+
 // Create a dynamic library or executable
 //
 // This will invoke the system linker/cc to create the resulting file. This
@@ -472,7 +487,6 @@ fn link_natively(sess: &Session,
     // The invocations of cc share some flags across platforms
     let (pname, mut cmd) = get_linker(sess, &linker, flavor);
 
-    let root = sess.target_filesearch(PathKind::Native).get_lib_path();
     if let Some(args) = sess.target.target.options.pre_link_args.get(&flavor) {
         cmd.args(args);
     }
@@ -500,12 +514,12 @@ fn link_natively(sess: &Session,
         &sess.target.target.options.pre_link_objects_dll
     };
     for obj in pre_link_objects {
-        cmd.arg(root.join(obj));
+        cmd.arg(get_file_path(sess, obj));
     }
 
     if crate_type == config::CrateType::Executable && sess.crt_static() {
         for obj in &sess.target.target.options.pre_link_objects_exe_crt {
-            cmd.arg(root.join(obj));
+            cmd.arg(get_file_path(sess, obj));
         }
     }
 
@@ -529,11 +543,11 @@ fn link_natively(sess: &Session,
         cmd.args(args);
     }
     for obj in &sess.target.target.options.post_link_objects {
-        cmd.arg(root.join(obj));
+        cmd.arg(get_file_path(sess, obj));
     }
     if sess.crt_static() {
         for obj in &sess.target.target.options.post_link_objects_crt {
-            cmd.arg(root.join(obj));
+            cmd.arg(get_file_path(sess, obj));
         }
     }
     if let Some(args) = sess.target.target.options.post_link_args.get(&flavor) {