don't use `ld -r` with `-C codegen-units=1`
diff --git a/src/librustc/back/write.rs b/src/librustc/back/write.rs
index 506d358..627d455 100644
--- a/src/librustc/back/write.rs
+++ b/src/librustc/back/write.rs
@@ -476,6 +476,9 @@
sess.fatal("can't perform LTO when using multiple codegen units");
}
+ // Sanity check
+ assert!(trans.modules.len() == sess.opts.cg.codegen_units);
+
unsafe {
configure_llvm(sess);
}
@@ -607,6 +610,15 @@
};
let link_obj = |output_path: &Path| {
+ // Running `ld -r` on a single input is kind of pointless.
+ if sess.opts.cg.codegen_units == 1 {
+ fs::copy(&crate_output.with_extension("0.o"),
+ output_path).unwrap();
+ // Leave the .0.o file around, to mimic the behavior of the normal
+ // code path.
+ return;
+ }
+
// Some builds of MinGW GCC will pass --force-exe-suffix to ld, which
// will automatically add a .exe extension if the extension is not
// already .exe or .dll. To ensure consistent behavior on Windows, we
