Properly parse '--extern-private' with name and path

src/tools/compiletest/src/header.rs

@@ -286,6 +286,9 @@ pub struct TestProps {
     // directory as the test, but for backwards compatibility reasons
     // we also check the auxiliary directory)
     pub aux_builds: Vec<String>,
+    // A list of crates to pass '--extern-private name:PATH' flags for
+    // This should be a subset of 'aux_build'
+    pub extern_private: Vec<String>,
     // Environment settings to use for compiling
     pub rustc_env: Vec<(String, String)>,
     // Environment settings to use during execution
@@ -353,6 +356,7 @@ impl TestProps {
             run_flags: None,
             pp_exact: None,
             aux_builds: vec![],
+            extern_private: vec![],
             revisions: vec![],
             rustc_env: vec![],
             exec_env: vec![],
@@ -469,6 +473,10 @@ impl TestProps {
                 self.aux_builds.push(ab);
             }
 
+            if let Some(ep) = config.parse_extern_private(ln) {
+                self.extern_private.push(ep);
+            }
+
             if let Some(ee) = config.parse_env(ln, "exec-env") {
                 self.exec_env.push(ee);
             }
@@ -610,6 +618,10 @@ impl Config {
             .map(|r| r.trim().to_string())
     }
 
+    fn parse_extern_private(&self, line: &str) -> Option<String> {
+        self.parse_name_value_directive(line, "extern-private")
+    }
+
     fn parse_compile_flags(&self, line: &str) -> Option<String> {
         self.parse_name_value_directive(line, "compile-flags")
     }

src/tools/compiletest/src/runtest.rs

@@ -74,6 +74,17 @@ pub fn dylib_env_var() -> &'static str {
     }
 }
 
+/// The platform-specific library file extension
+pub fn lib_extension() -> &'static str {
+    if cfg!(windows) {
+        ".dll"
+    } else if cfg!(target_os = "macos") {
+        ".dylib"
+    } else {
+        ".so"
+    }
+}
+
 #[derive(Debug, PartialEq)]
 pub enum DiffLine {
     Context(String),
@@ -1585,6 +1596,13 @@ impl<'test> TestCx<'test> {
             create_dir_all(&aux_dir).unwrap();
         }
 
+        for priv_dep in &self.props.extern_private {
+            let lib_name = format!("lib{}{}", priv_dep, lib_extension());
+            rustc
+                .arg("--extern-private")
+                .arg(format!("{}={}", priv_dep, aux_dir.join(lib_name).to_str().unwrap()));
+        }
+
         for rel_ab in &self.props.aux_builds {
             let aux_testpaths = self.compute_aux_test_paths(rel_ab);
             let aux_props =