Add x.py option to --force-rerun compiletest tests

src/bootstrap/builder/tests.rs

@@ -486,6 +486,7 @@ mod dist {
             fail_fast: true,
             doc_tests: DocTests::No,
             bless: false,
+            force_rerun: false,
             compare_mode: None,
             rustfix_coverage: false,
             pass: None,
@@ -527,6 +528,7 @@ mod dist {
             fail_fast: true,
             doc_tests: DocTests::No,
             bless: false,
+            force_rerun: false,
             compare_mode: None,
             rustfix_coverage: false,
             pass: None,
@@ -583,6 +585,7 @@ mod dist {
             fail_fast: true,
             doc_tests: DocTests::Yes,
             bless: false,
+            force_rerun: false,
             compare_mode: None,
             rustfix_coverage: false,
             pass: None,

src/bootstrap/flags.rs

@@ -102,6 +102,7 @@ pub enum Subcommand {
         paths: Vec<PathBuf>,
         /// Whether to automatically update stderr/stdout files
         bless: bool,
+        force_rerun: bool,
         compare_mode: Option<String>,
         pass: Option<String>,
         run: Option<String>,
@@ -284,6 +285,7 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`",
                 opts.optflag("", "no-doc", "do not run doc tests");
                 opts.optflag("", "doc", "only run doc tests");
                 opts.optflag("", "bless", "update all stderr/stdout files of failing ui tests");
+                opts.optflag("", "force-rerun", "rerun tests even if the inputs are unchanged");
                 opts.optopt(
                     "",
                     "compare-mode",
@@ -558,6 +560,7 @@ Arguments:
             "test" | "t" => Subcommand::Test {
                 paths,
                 bless: matches.opt_present("bless"),
+                force_rerun: matches.opt_present("force-rerun"),
                 compare_mode: matches.opt_str("compare-mode"),
                 pass: matches.opt_str("pass"),
                 run: matches.opt_str("run"),
@@ -726,6 +729,13 @@ impl Subcommand {
         }
     }
 
+    pub fn force_rerun(&self) -> bool {
+        match *self {
+            Subcommand::Test { force_rerun, .. } => force_rerun,
+            _ => false,
+        }
+    }
+
     pub fn rustfix_coverage(&self) -> bool {
         match *self {
             Subcommand::Test { rustfix_coverage, .. } => rustfix_coverage,

src/bootstrap/test.rs

@@ -1315,6 +1315,10 @@ note: if you're sure you want to do this, please open an issue as to why. In the
             cmd.arg("--bless");
         }
 
+        if builder.config.cmd.force_rerun() {
+            cmd.arg("--force-rerun");
+        }
+
         let compare_mode =
             builder.config.cmd.compare_mode().or_else(|| {
                 if builder.config.test_compare_mode { self.compare_mode } else { None }

src/tools/compiletest/src/common.rs

@@ -362,6 +362,9 @@ pub struct Config {
     pub nodejs: Option<String>,
     /// Path to a npm executable. Used for rustdoc GUI tests
     pub npm: Option<String>,
+
+    /// Whether to rerun tests even if the inputs are unchanged.
+    pub force_rerun: bool,
 }
 
 impl Config {

src/tools/compiletest/src/main.rs

@@ -144,6 +144,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
             "enable this to generate a Rustfix coverage file, which is saved in \
                 `./<build_base>/rustfix_missing_coverage.txt`",
         )
+        .optflag("", "force-rerun", "rerun tests even if the inputs are unchanged")
         .optflag("h", "help", "show this message")
         .reqopt("", "channel", "current Rust channel", "CHANNEL");
 
@@ -289,6 +290,8 @@ pub fn parse_config(args: Vec<String>) -> Config {
         llvm_components: matches.opt_str("llvm-components").unwrap(),
         nodejs: matches.opt_str("nodejs"),
         npm: matches.opt_str("npm"),
+
+        force_rerun: matches.opt_present("force-rerun"),
     }
 }
 
@@ -644,13 +647,15 @@ fn make_test(config: &Config, testpaths: &TestPaths, inputs: &Stamp) -> Vec<test
             let test_name = crate::make_test_name(config, testpaths, revision);
             let mut desc = make_test_description(config, test_name, &test_path, src_file, cfg);
             // Ignore tests that already run and are up to date with respect to inputs.
-            desc.ignore |= is_up_to_date(
-                config,
-                testpaths,
-                &early_props,
-                revision.map(|s| s.as_str()),
-                inputs,
-            );
+            if !config.force_rerun {
+                desc.ignore |= is_up_to_date(
+                    config,
+                    testpaths,
+                    &early_props,
+                    revision.map(|s| s.as_str()),
+                    inputs,
+                );
+            }
             test::TestDescAndFn { desc, testfn: make_test_closure(config, testpaths, revision) }
         })
         .collect()