Add test skip support

libtest already supports a "--skip SUBSTRING" arg which excludes any
test names matching SUBSTRING.

This adds a "--skip" argument to compiletest and bootstrap which is
forwarded to libtest.

src/bootstrap/builder/tests.rs

@@ -495,6 +495,7 @@ mod dist {
         config.stage = 0;
         config.cmd = Subcommand::Test {
             paths: vec!["library/std".into()],
+            skip: vec![],
             test_args: vec![],
             rustc_args: vec![],
             fail_fast: true,
@@ -565,6 +566,7 @@ mod dist {
         let mut config = configure(&["A"], &["A"]);
         config.cmd = Subcommand::Test {
             paths: vec![],
+            skip: vec![],
             test_args: vec![],
             rustc_args: vec![],
             fail_fast: true,

src/bootstrap/flags.rs

@@ -111,6 +111,7 @@ pub enum Subcommand {
         compare_mode: Option<String>,
         pass: Option<String>,
         run: Option<String>,
+        skip: Vec<String>,
         test_args: Vec<String>,
         rustc_args: Vec<String>,
         fail_fast: bool,
@@ -261,6 +262,7 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`",
         match subcommand {
             Kind::Test => {
                 opts.optflag("", "no-fail-fast", "Run all tests regardless of failure");
+                opts.optmulti("", "skip", "skips tests matching SUBSTRING, if supported by test tool. May be passed multiple times", "SUBSTRING");
                 opts.optmulti(
                     "",
                     "test-args",
@@ -545,6 +547,7 @@ Arguments:
                 compare_mode: matches.opt_str("compare-mode"),
                 pass: matches.opt_str("pass"),
                 run: matches.opt_str("run"),
+                skip: matches.opt_strs("skip"),
                 test_args: matches.opt_strs("test-args"),
                 rustc_args: matches.opt_strs("rustc-args"),
                 fail_fast: !matches.opt_present("no-fail-fast"),
@@ -689,12 +692,26 @@ impl Subcommand {
     }
 
     pub fn test_args(&self) -> Vec<&str> {
+        let mut args = vec![];
+
+        match *self {
+            Subcommand::Test { ref skip, .. } => {
+                for s in skip {
+                    args.push("--skip");
+                    args.push(s.as_str());
+                }
+            }
+            _ => (),
+        };
+
         match *self {
             Subcommand::Test { ref test_args, .. } | Subcommand::Bench { ref test_args, .. } => {
-                test_args.iter().flat_map(|s| s.split_whitespace()).collect()
+                args.extend(test_args.iter().flat_map(|s| s.split_whitespace()))
             }
-            _ => Vec::new(),
+            _ => (),
         }
+
+        args
     }
 
     pub fn rustc_args(&self) -> Vec<&str> {

src/tools/compiletest/src/common.rs

@@ -246,6 +246,10 @@ pub struct Config {
     /// Only run tests that match these filters
     pub filters: Vec<String>,
 
+    /// Skip tests tests matching these substrings. Corresponds to
+    /// `test::TestOpts::skip`. `filter_exact` does not apply to these flags.
+    pub skip: Vec<String>,
+
     /// Exactly match the filter, rather than a substring
     pub filter_exact: bool,
 

src/tools/compiletest/src/main.rs

@@ -91,6 +91,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
         )
         .optopt("", "run", "whether to execute run-* tests", "auto | always | never")
         .optflag("", "ignored", "run tests marked as ignored")
+        .optmulti("", "skip", "skip tests matching SUBSTRING. Can be passed multiple times", "SUBSTRING")
         .optflag("", "exact", "filters match exactly")
         .optopt(
             "",
@@ -236,6 +237,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
         debugger: None,
         run_ignored,
         filters: matches.free.clone(),
+        skip: matches.opt_strs("skip"),
         filter_exact: matches.opt_present("exact"),
         force_pass_mode: matches.opt_str("pass").map(|mode| {
             mode.parse::<PassMode>()
@@ -312,6 +314,7 @@ pub fn log_config(config: &Config) {
     logv(c, format!("mode: {}", config.mode));
     logv(c, format!("run_ignored: {}", config.run_ignored));
     logv(c, format!("filters: {:?}", config.filters));
+    logv(c, format!("skip: {:?}", config.skip));
     logv(c, format!("filter_exact: {}", config.filter_exact));
     logv(
         c,
@@ -506,7 +509,7 @@ pub fn test_opts(config: &Config) -> test::TestOpts {
         shuffle: false,
         shuffle_seed: None,
         test_threads: None,
-        skip: vec![],
+        skip: config.skip.clone(),
         list: false,
         options: test::Options::new(),
         time_options: None,
@@ -595,6 +598,7 @@ fn collect_tests_from_dir(
             debug!("found test file: {:?}", file_path.display());
             let paths =
                 TestPaths { file: file_path, relative_dir: relative_dir_path.to_path_buf() };
+
             tests.extend(make_test(config, &paths, inputs))
         } else if file_path.is_dir() {
             let relative_file_path = relative_dir_path.join(file.file_name());