Convert run-make/windows-safeseh to rmake

Author: ChrisDenton

src/tools/run-make-support/src/rustc.rs

@@ -203,6 +203,12 @@ impl Rustc {
         self
     }
 
+    /// Specify the linker
+    pub fn linker(&mut self, linker: &str) -> &mut Self {
+        self.cmd.arg(format!("-Clinker={linker}"));
+        self
+    }
+
     /// Get the [`Output`] of the finished process.
     #[track_caller]
     pub fn command_output(&mut self) -> ::std::process::Output {

tests/run-make/windows-safeseh/Makefile

@@ -0,0 +1,15 @@
+//@ only-windows
+//@ needs-rust-lld
+
+use run_make_support::rustc;
+
+fn main() {
+    // Ensure that LLD can link when an .rlib contains a synthetic object
+    // file referencing exported or used symbols.
+    rustc().input("foo.rs").linker("rust-lld").run();
+
+    // Ensure that LLD can link when /WHOLEARCHIVE: is used with an .rlib.
+    // Previously, lib.rmeta was not marked as (trivially) SAFESEH-aware.
+    rustc().input("baz.rs").run();
+    rustc().input("bar.rs").linker("rust-lld").link_arg("/WHOLEARCHIVE:libbaz.rlib").run();
+}