Rollup merge of #138139 - xizheyin:issue-137384, r=ChrisDenton

Emit warning while outputs is not exe and prints linkage info

cc #137384

```bash
$ rustc +stage1 /dev/null --print native-static-libs --crate-type staticlib  --emit metadata
warning: skipping link step due to conflict: cannot output linkage information without emitting executable

note: consider emitting executable to print link information

warning: 1 warning emitted
```

1 files changed, 19 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index c5792da2678..b802284eb32 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -68,6 +68,23 @@ pub fn ensure_removed(dcx: DiagCtxtHandle<'_>, path: &Path) {
     }
 }
 
+fn check_link_info_print_request(sess: &Session, crate_types: &[CrateType]) {
+    let print_native_static_libs =
+        sess.opts.prints.iter().any(|p| p.kind == PrintKind::NativeStaticLibs);
+    let has_staticlib = crate_types.iter().any(|ct| *ct == CrateType::Staticlib);
+    if print_native_static_libs {
+        if !has_staticlib {
+            sess.dcx()
+                .warn(format!("cannot output linkage information without staticlib crate-type"));
+            sess.dcx()
+                .note(format!("consider `--crate-type staticlib` to print linkage information"));
+        } else if !sess.opts.output_types.should_link() {
+            sess.dcx()
+                .warn(format!("cannot output linkage information when --emit link is not passed"));
+        }
+    }
+}
+
 /// Performs the linkage portion of the compilation phase. This will generate all
 /// of the requested outputs for this compilation session.
 pub fn link_binary(
@@ -180,6 +197,8 @@ pub fn link_binary(
         }
     }
 
+    check_link_info_print_request(sess, &codegen_results.crate_info.crate_types);
+
     // Remove the temporary object file and metadata if we aren't saving temps.
     sess.time("link_binary_remove_temps", || {
         // If the user requests that temporaries are saved, don't delete any.