1 files changed, 168 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/compile-test.rs b/src/tools/clippy/tests/compile-test.rs
new file mode 100644
index 00000000000..de2cf6d7873
--- /dev/null
+++ b/src/tools/clippy/tests/compile-test.rs
@@ -0,0 +1,168 @@
+#![feature(test)] // compiletest_rs requires this attribute
+
+use compiletest_rs as compiletest;
+use compiletest_rs::common::Mode as TestMode;
+
+use std::env::{self, set_var};
+use std::ffi::OsStr;
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+mod cargo;
+
+fn host_lib() -> PathBuf {
+    if let Some(path) = option_env!("HOST_LIBS") {
+        PathBuf::from(path)
+    } else {
+        cargo::CARGO_TARGET_DIR.join(env!("PROFILE"))
+    }
+}
+
+fn clippy_driver_path() -> PathBuf {
+    if let Some(path) = option_env!("CLIPPY_DRIVER_PATH") {
+        PathBuf::from(path)
+    } else {
+        cargo::TARGET_LIB.join("clippy-driver")
+    }
+}
+
+// When we'll want to use `extern crate ..` for a dependency that is used
+// both by the crate and the compiler itself, we can't simply pass -L flags
+// as we'll get a duplicate matching versions. Instead, disambiguate with
+// `--extern dep=path`.
+// See https://github.com/rust-lang/rust-clippy/issues/4015.
+//
+// FIXME: We cannot use `cargo build --message-format=json` to resolve to dependency files.
+//        Because it would force-rebuild if the options passed to `build` command is not the same
+//        as what we manually pass to `cargo` invocation
+fn third_party_crates() -> String {
+    use std::collections::HashMap;
+    static CRATES: &[&str] = &["serde", "serde_derive", "regex", "clippy_lints"];
+    let dep_dir = cargo::TARGET_LIB.join("deps");
+    let mut crates: HashMap<&str, PathBuf> = HashMap::with_capacity(CRATES.len());
+    for entry in fs::read_dir(dep_dir).unwrap() {
+        let path = match entry {
+            Ok(entry) => entry.path(),
+            _ => continue,
+        };
+        if let Some(name) = path.file_name().and_then(OsStr::to_str) {
+            for dep in CRATES {
+                if name.starts_with(&format!("lib{}-", dep)) && name.ends_with(".rlib") {
+                    crates.entry(dep).or_insert(path);
+                    break;
+                }
+            }
+        }
+    }
+
+    let v: Vec<_> = crates
+        .into_iter()
+        .map(|(dep, path)| format!("--extern {}={}", dep, path.display()))
+        .collect();
+    v.join(" ")
+}
+
+fn default_config() -> compiletest::Config {
+    let mut config = compiletest::Config::default();
+
+    if let Ok(name) = env::var("TESTNAME") {
+        config.filter = Some(name);
+    }
+
+    if let Some(path) = option_env!("RUSTC_LIB_PATH") {
+        let path = PathBuf::from(path);
+        config.run_lib_path = path.clone();
+        config.compile_lib_path = path;
+    }
+
+    config.target_rustcflags = Some(format!(
+        "-L {0} -L {1} -Dwarnings -Zui-testing {2}",
+        host_lib().join("deps").display(),
+        cargo::TARGET_LIB.join("deps").display(),
+        third_party_crates(),
+    ));
+
+    config.build_base = if cargo::is_rustc_test_suite() {
+        // This make the stderr files go to clippy OUT_DIR on rustc repo build dir
+        let mut path = PathBuf::from(env!("OUT_DIR"));
+        path.push("test_build_base");
+        path
+    } else {
+        host_lib().join("test_build_base")
+    };
+    config.rustc_path = clippy_driver_path();
+    config
+}
+
+fn run_mode(cfg: &mut compiletest::Config) {
+    cfg.mode = TestMode::Ui;
+    cfg.src_base = Path::new("tests").join("ui");
+    compiletest::run_tests(&cfg);
+}
+
+#[allow(clippy::identity_conversion)]
+fn run_ui_toml_tests(config: &compiletest::Config, mut tests: Vec<tester::TestDescAndFn>) -> Result<bool, io::Error> {
+    let mut result = true;
+    let opts = compiletest::test_opts(config);
+    for dir in fs::read_dir(&config.src_base)? {
+        let dir = dir?;
+        if !dir.file_type()?.is_dir() {
+            continue;
+        }
+        let dir_path = dir.path();
+        set_var("CARGO_MANIFEST_DIR", &dir_path);
+        for file in fs::read_dir(&dir_path)? {
+            let file = file?;
+            let file_path = file.path();
+            if file.file_type()?.is_dir() {
+                continue;
+            }
+            if file_path.extension() != Some(OsStr::new("rs")) {
+                continue;
+            }
+            let paths = compiletest::common::TestPaths {
+                file: file_path,
+                base: config.src_base.clone(),
+                relative_dir: dir_path.file_name().unwrap().into(),
+            };
+            let test_name = compiletest::make_test_name(&config, &paths);
+            let index = tests
+                .iter()
+                .position(|test| test.desc.name == test_name)
+                .expect("The test should be in there");
+            result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+        }
+    }
+    Ok(result)
+}
+
+fn run_ui_toml(config: &mut compiletest::Config) {
+    config.mode = TestMode::Ui;
+    config.src_base = Path::new("tests").join("ui-toml").canonicalize().unwrap();
+
+    let tests = compiletest::make_tests(&config);
+
+    let res = run_ui_toml_tests(&config, tests);
+    match res {
+        Ok(true) => {},
+        Ok(false) => panic!("Some tests failed"),
+        Err(e) => {
+            println!("I/O failure during tests: {:?}", e);
+        },
+    }
+}
+
+fn prepare_env() {
+    set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
+    set_var("CLIPPY_TESTS", "true");
+    //set_var("RUST_BACKTRACE", "0");
+}
+
+#[test]
+fn compile_test() {
+    prepare_env();
+    let mut config = default_config();
+    run_mode(&mut config);
+    run_ui_toml(&mut config);
+}