Fix rustdoc help message when no args are passed

Author: bjorn3

scripts/rustc-clif.rs

@@ -26,9 +26,10 @@ fn main() {
         codegen_backend_arg.push(cg_clif_dylib_path);
         args.push(codegen_backend_arg);
     }
-    if !passed_args.iter().any(|arg| {
-        arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot="))
-    }) {
+    if !passed_args
+        .iter()
+        .any(|arg| arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot=")))
+    {
         args.push(OsString::from("--sysroot"));
         args.push(OsString::from(sysroot.to_str().unwrap()));
     }

scripts/rustdoc-clif.rs

@@ -26,12 +26,18 @@ fn main() {
         codegen_backend_arg.push(cg_clif_dylib_path);
         args.push(codegen_backend_arg);
     }
-    if !passed_args.iter().any(|arg| {
-        arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot="))
-    }) {
+    if !passed_args
+        .iter()
+        .any(|arg| arg == "--sysroot" || arg.to_str().is_some_and(|s| s.starts_with("--sysroot=")))
+    {
         args.push(OsString::from("--sysroot"));
         args.push(OsString::from(sysroot.to_str().unwrap()));
     }
+    if passed_args.is_empty() {
+        // Don't pass any arguments when the user didn't pass any arguments
+        // either to ensure the help message is shown.
+        args.clear();
+    }
     args.extend(passed_args);
 
     let rustdoc = if let Some(rustdoc) = option_env!("RUSTDOC") {

scripts/test_rustc_tests.sh

@@ -99,9 +99,6 @@ rm tests/ui/mir/mir_raw_fat_ptr.rs # same
 rm tests/ui/consts/issue-33537.rs # same
 rm tests/ui/consts/const-mut-refs-crate.rs # same
 
-# rustdoc-clif passes extra args, suppressing the help message when no args are passed
-rm -r tests/run-make/issue-88756-default-output
-
 # doesn't work due to the way the rustc test suite is invoked.
 # should work when using ./x.py test the way it is intended
 # ============================================================