rustbuild: Add ./x.py test --no-fail-fast

This option forwards to each `cargo test` invocation, and applies the
same logic across all test steps to keep going after failures.  At the
end, a brief summary line reports how many commands failed, if any.

Note that if a test program fails to even start at all, or if an
auxiliary build command related to testing fails, these are still left
to stop everything right away.

Fixes #40219.

src/bootstrap/check.rs

@@ -58,6 +58,28 @@ impl fmt::Display for TestKind {
     }
 }
 
+fn try_run(build: &Build, cmd: &mut Command) {
+    if build.flags.cmd.no_fail_fast() {
+        if !build.try_run(cmd) {
+            let failures = build.delayed_failures.get();
+            build.delayed_failures.set(failures + 1);
+        }
+    } else {
+        build.run(cmd);
+    }
+}
+
+fn try_run_quiet(build: &Build, cmd: &mut Command) {
+    if build.flags.cmd.no_fail_fast() {
+        if !build.try_run_quiet(cmd) {
+            let failures = build.delayed_failures.get();
+            build.delayed_failures.set(failures + 1);
+        }
+    } else {
+        build.run_quiet(cmd);
+    }
+}
+
 /// Runs the `linkchecker` tool as compiled in `stage` by the `host` compiler.
 ///
 /// This tool in `src/tools` will verify the validity of all our links in the
@@ -67,8 +89,8 @@ pub fn linkcheck(build: &Build, host: &str) {
     let compiler = Compiler::new(0, host);
 
     let _time = util::timeit();
-    build.run(build.tool_cmd(&compiler, "linkchecker")
-                   .arg(build.out.join(host).join("doc")));
+    try_run(build, build.tool_cmd(&compiler, "linkchecker")
+                        .arg(build.out.join(host).join("doc")));
 }
 
 /// Runs the `cargotest` tool as compiled in `stage` by the `host` compiler.
@@ -87,10 +109,10 @@ pub fn cargotest(build: &Build, stage: u32, host: &str) {
     let _time = util::timeit();
     let mut cmd = Command::new(build.tool(&Compiler::new(0, host), "cargotest"));
     build.prepare_tool_cmd(compiler, &mut cmd);
-    build.run(cmd.arg(&build.cargo)
-                 .arg(&out_dir)
-                 .env("RUSTC", build.compiler_path(compiler))
-                 .env("RUSTDOC", build.rustdoc(compiler)))
+    try_run(build, cmd.arg(&build.cargo)
+                      .arg(&out_dir)
+                      .env("RUSTC", build.compiler_path(compiler))
+                      .env("RUSTDOC", build.rustdoc(compiler)));
 }
 
 /// Runs `cargo test` for `cargo` packaged with Rust.
@@ -107,6 +129,9 @@ pub fn cargo(build: &Build, stage: u32, host: &str) {
 
     let mut cargo = build.cargo(compiler, Mode::Tool, host, "test");
     cargo.arg("--manifest-path").arg(build.src.join("src/tools/cargo/Cargo.toml"));
+    if build.flags.cmd.no_fail_fast() {
+        cargo.arg("--no-fail-fast");
+    }
 
     // Don't build tests dynamically, just a pain to work with
     cargo.env("RUSTC_NO_PREFER_DYNAMIC", "1");
@@ -115,7 +140,7 @@ pub fn cargo(build: &Build, stage: u32, host: &str) {
     // available.
     cargo.env("CFG_DISABLE_CROSS_TESTS", "1");
 
-    build.run(cargo.env("PATH", newpath));
+    try_run(build, cargo.env("PATH", newpath));
 }
 
 /// Runs the `tidy` tool as compiled in `stage` by the `host` compiler.
@@ -135,7 +160,7 @@ pub fn tidy(build: &Build, host: &str) {
     if build.config.quiet_tests {
         cmd.arg("--quiet");
     }
-    build.run(&mut cmd);
+    try_run(build, &mut cmd);
 }
 
 fn testdir(build: &Build, host: &str) -> PathBuf {
@@ -286,7 +311,7 @@ pub fn compiletest(build: &Build,
     build.ci_env.force_coloring_in_ci(&mut cmd);
 
     let _time = util::timeit();
-    build.run(&mut cmd);
+    try_run(build, &mut cmd);
 }
 
 /// Run `rustdoc --test` for all documentation in `src/doc`.
@@ -362,9 +387,9 @@ fn markdown_test(build: &Build, compiler: &Compiler, markdown: &Path) {
     cmd.arg("--test-args").arg(test_args);
 
     if build.config.quiet_tests {
-        build.run_quiet(&mut cmd);
+        try_run_quiet(build, &mut cmd);
     } else {
-        build.run(&mut cmd);
+        try_run(build, &mut cmd);
     }
 }
 
@@ -419,6 +444,9 @@ pub fn krate(build: &Build,
     cargo.arg("--manifest-path")
          .arg(build.src.join(path).join("Cargo.toml"))
          .arg("--features").arg(features);
+    if test_kind.subcommand() == "test" && build.flags.cmd.no_fail_fast() {
+        cargo.arg("--no-fail-fast");
+    }
 
     match krate {
         Some(krate) => {
@@ -478,7 +506,7 @@ pub fn krate(build: &Build,
         krate_remote(build, &compiler, target, mode);
     } else {
         cargo.args(&build.flags.cmd.test_args());
-        build.run(&mut cargo);
+        try_run(build, &mut cargo);
     }
 }
 
@@ -499,7 +527,7 @@ fn krate_emscripten(build: &Build,
         if build.config.quiet_tests {
             cmd.arg("--quiet");
         }
-        build.run(&mut cmd);
+        try_run(build, &mut cmd);
     }
 }
 
@@ -521,7 +549,7 @@ fn krate_remote(build: &Build,
             cmd.arg("--quiet");
         }
         cmd.args(&build.flags.cmd.test_args());
-        build.run(&mut cmd);
+        try_run(build, &mut cmd);
     }
 }
 
@@ -637,6 +665,9 @@ pub fn bootstrap(build: &Build) {
        .current_dir(build.src.join("src/bootstrap"))
        .env("CARGO_TARGET_DIR", build.out.join("bootstrap"))
        .env("RUSTC", &build.rustc);
+    if build.flags.cmd.no_fail_fast() {
+        cmd.arg("--no-fail-fast");
+    }
     cmd.arg("--").args(&build.flags.cmd.test_args());
-    build.run(&mut cmd);
+    try_run(build, &mut cmd);
 }

src/bootstrap/flags.rs

@@ -61,6 +61,7 @@ pub enum Subcommand {
     Test {
         paths: Vec<PathBuf>,
         test_args: Vec<String>,
+        no_fail_fast: bool,
     },
     Bench {
         paths: Vec<PathBuf>,
@@ -141,7 +142,10 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`");
 
         // Some subcommands get extra options
         match subcommand.as_str() {
-            "test"  => { opts.optmulti("", "test-args", "extra arguments", "ARGS"); },
+            "test"  => {
+                opts.optflag("", "no-fail-fast", "Run all tests regardless of failure");
+                opts.optmulti("", "test-args", "extra arguments", "ARGS");
+            },
             "bench" => { opts.optmulti("", "test-args", "extra arguments", "ARGS"); },
             _ => { },
         };
@@ -263,6 +267,7 @@ Arguments:
                 Subcommand::Test {
                     paths: paths,
                     test_args: matches.opt_strs("test-args"),
+                    no_fail_fast: matches.opt_present("no-fail-fast"),
                 }
             }
             "bench" => {
@@ -342,6 +347,13 @@ impl Subcommand {
             _ => Vec::new(),
         }
     }
+
+    pub fn no_fail_fast(&self) -> bool {
+        match *self {
+            Subcommand::Test { no_fail_fast, .. } => no_fail_fast,
+            _ => false,
+        }
+    }
 }
 
 fn split(s: Vec<String>) -> Vec<String> {

src/bootstrap/lib.rs

@@ -79,6 +79,7 @@ extern crate toml;
 #[cfg(unix)]
 extern crate libc;
 
+use std::cell::Cell;
 use std::cmp;
 use std::collections::HashMap;
 use std::env;
@@ -88,7 +89,7 @@ use std::io::Read;
 use std::path::{PathBuf, Path};
 use std::process::Command;
 
-use build_helper::{run_silent, run_suppressed, output, mtime};
+use build_helper::{run_silent, run_suppressed, try_run_silent, try_run_suppressed, output, mtime};
 
 use util::{exe, libdir, add_lib_path, OutputFolder, CiEnv};
 
@@ -180,6 +181,7 @@ pub struct Build {
     is_sudo: bool,
     src_is_git: bool,
     ci_env: CiEnv,
+    delayed_failures: Cell<usize>,
 }
 
 #[derive(Debug)]
@@ -274,6 +276,7 @@ impl Build {
             is_sudo: is_sudo,
             src_is_git: src_is_git,
             ci_env: CiEnv::current(),
+            delayed_failures: Cell::new(0),
         }
     }
 
@@ -784,6 +787,22 @@ impl Build {
         run_suppressed(cmd)
     }
 
+    /// Runs a command, printing out nice contextual information if it fails.
+    /// Exits if the command failed to execute at all, otherwise returns its
+    /// `status.success()`.
+    fn try_run(&self, cmd: &mut Command) -> bool {
+        self.verbose(&format!("running: {:?}", cmd));
+        try_run_silent(cmd)
+    }
+
+    /// Runs a command, printing out nice contextual information if it fails.
+    /// Exits if the command failed to execute at all, otherwise returns its
+    /// `status.success()`.
+    fn try_run_quiet(&self, cmd: &mut Command) -> bool {
+        self.verbose(&format!("running: {:?}", cmd));
+        try_run_suppressed(cmd)
+    }
+
     /// Prints a message if this build is configured in verbose mode.
     fn verbose(&self, msg: &str) {
         if self.flags.verbose() || self.config.verbose() {

src/bootstrap/step.rs

@@ -28,6 +28,7 @@
 
 use std::collections::{BTreeMap, HashSet, HashMap};
 use std::mem;
+use std::process;
 
 use check::{self, TestKind};
 use compile;
@@ -1174,8 +1175,8 @@ invalid rule dependency graph detected, was a rule added and maybe typo'd?
         let (kind, paths) = match self.build.flags.cmd {
             Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
             Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
-            Subcommand::Test { ref paths, test_args: _ } => (Kind::Test, &paths[..]),
-            Subcommand::Bench { ref paths, test_args: _ } => (Kind::Bench, &paths[..]),
+            Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
+            Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
             Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
             Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
             Subcommand::Clean => panic!(),
@@ -1268,6 +1269,13 @@ invalid rule dependency graph detected, was a rule added and maybe typo'd?
             self.build.verbose(&format!("executing step {:?}", step));
             (self.rules[step.name].run)(step);
         }
+
+        // Check for postponed failures from `test --no-fail-fast`.
+        let failures = self.build.delayed_failures.get();
+        if failures > 0 {
+            println!("\n{} command(s) did not execute successfully.\n", failures);
+            process::exit(1);
+        }
     }
 
     /// From the top level targets `steps` generate a topological ordering of

src/build_helper/lib.rs

@@ -42,35 +42,49 @@ pub fn run(cmd: &mut Command) {
 }
 
 pub fn run_silent(cmd: &mut Command) {
+    if !try_run_silent(cmd) {
+        std::process::exit(1);
+    }
+}
+
+pub fn try_run_silent(cmd: &mut Command) -> bool {
     let status = match cmd.status() {
         Ok(status) => status,
         Err(e) => fail(&format!("failed to execute command: {:?}\nerror: {}",
                                 cmd, e)),
     };
     if !status.success() {
-        fail(&format!("command did not execute successfully: {:?}\n\
-                       expected success, got: {}",
-                      cmd,
-                      status));
+        println!("\n\ncommand did not execute successfully: {:?}\n\
+                  expected success, got: {}\n\n",
+                 cmd,
+                 status);
     }
+    status.success()
 }
 
 pub fn run_suppressed(cmd: &mut Command) {
+    if !try_run_suppressed(cmd) {
+        std::process::exit(1);
+    }
+}
+
+pub fn try_run_suppressed(cmd: &mut Command) -> bool {
     let output = match cmd.output() {
         Ok(status) => status,
         Err(e) => fail(&format!("failed to execute command: {:?}\nerror: {}",
                                 cmd, e)),
     };
     if !output.status.success() {
-        fail(&format!("command did not execute successfully: {:?}\n\
-                       expected success, got: {}\n\n\
-                       stdout ----\n{}\n\
-                       stderr ----\n{}\n",
-                      cmd,
-                      output.status,
-                      String::from_utf8_lossy(&output.stdout),
-                      String::from_utf8_lossy(&output.stderr)));
+        println!("\n\ncommand did not execute successfully: {:?}\n\
+                  expected success, got: {}\n\n\
+                  stdout ----\n{}\n\
+                  stderr ----\n{}\n\n",
+                 cmd,
+                 output.status,
+                 String::from_utf8_lossy(&output.stdout),
+                 String::from_utf8_lossy(&output.stderr));
     }
+    output.status.success()
 }
 
 pub fn gnu_target(target: &str) -> String {