Rollup merge of #126072 - Zalathar:run-flags, r=jieyouxu

compiletest: Allow multiple `//@ run-flags:` headers

While working on some tests, I was annoyed to find that multiple `// `@run-flags:`` headers do not combine with each other (as `//@ compile-flags:` headers do), and instead all but one are silently discarded.

This makes it impossible to split long flag lists into multiple lines.

Fortunately it's easy to just recycle the existing logic from the other command-line-flags headers.

src/tools/compiletest/src/header.rs

@@ -94,7 +94,7 @@ pub struct TestProps {
     // Extra flags to pass to the compiler
     pub compile_flags: Vec<String>,
     // Extra flags to pass when the compiled code is run (such as --bench)
-    pub run_flags: Option<String>,
+    pub run_flags: Vec<String>,
     // If present, the name of a file that this test should match when
     // pretty-printed
     pub pp_exact: Option<PathBuf>,
@@ -262,7 +262,7 @@ pub fn new() -> Self {
             error_patterns: vec![],
             regex_error_patterns: vec![],
             compile_flags: vec![],
-            run_flags: None,
+            run_flags: vec![],
             pp_exact: None,
             aux_builds: vec![],
             aux_bins: vec![],
@@ -399,7 +399,9 @@ fn split_flags(flags: &str) -> Vec<String> {
 
                     config.parse_and_update_revisions(ln, &mut self.revisions);
 
-                    config.set_name_value_directive(ln, RUN_FLAGS, &mut self.run_flags, |r| r);
+                    if let Some(flags) = config.parse_name_value_directive(ln, RUN_FLAGS) {
+                        self.run_flags.extend(split_flags(&flags));
+                    }
 
                     if self.pp_exact.is_none() {
                         self.pp_exact = config.parse_pp_exact(ln, testfile);

src/tools/compiletest/src/runtest.rs

@@ -2355,7 +2355,7 @@ fn make_run_args(&self) -> ProcArgs {
         args.push(exe_file.into_os_string());
 
         // Add the arguments in the run_flags directive
-        args.extend(self.split_maybe_args(&self.props.run_flags));
+        args.extend(self.props.run_flags.iter().map(OsString::from));
 
         let prog = args.remove(0);
         ProcArgs { prog, args }
@@ -4174,10 +4174,12 @@ fn get_mir_dump_dir(&self) -> PathBuf {
     }
 
     fn normalize_output(&self, output: &str, custom_rules: &[(String, String)]) -> String {
-        let rflags = self.props.run_flags.as_ref();
+        // Crude heuristic to detect when the output should have JSON-specific
+        // normalization steps applied.
+        let rflags = self.props.run_flags.join(" ");
         let cflags = self.props.compile_flags.join(" ");
-        let json = rflags
+        let json = rflags.contains("--format json")
-            .map_or(false, |s| s.contains("--format json") || s.contains("--format=json"))
+            || rflags.contains("--format=json")
             || cflags.contains("--error-format json")
             || cflags.contains("--error-format pretty-json")
             || cflags.contains("--error-format=json")

src/tools/rustdoc-gui-test/src/main.rs

@@ -123,9 +123,7 @@ fn main() -> Result<(), ()> {
                     cargo.env("RUSTDOCFLAGS", test_props.compile_flags.join(" "));
                 }
 
-                if let Some(flags) = &test_props.run_flags {
+                cargo.args(&test_props.run_flags);
-                    cargo.arg(flags);
-                }
             }
 
             if try_run(&mut cargo, config.verbose).is_err() {