Move some early config checks to the compiletest lib

Author: jieyouxu

src/tools/compiletest/src/lib.rs

@@ -1111,3 +1111,18 @@ fn check_for_overlapping_test_paths(found_path_stems: &HashSet<Utf8PathBuf>) {
         );
     }
 }
+
+pub fn early_config_check(config: &Config) {
+    if !config.has_html_tidy && config.mode == Mode::Rustdoc {
+        eprintln!("warning: `tidy` (html-tidy.org) is not installed; diffs will not be generated");
+    }
+
+    if !config.profiler_runtime && config.mode == Mode::CoverageRun {
+        let actioned = if config.bless { "blessed" } else { "checked" };
+        eprintln!(
+            r#"
+WARNING: profiler runtime is not available, so `.coverage` files won't be {actioned}
+help: try setting `profiler = true` in the `[build]` section of `bootstrap.toml`"#
+        );
+    }
+}

src/tools/compiletest/src/main.rs

@@ -2,8 +2,7 @@ use std::env;
 use std::io::IsTerminal;
 use std::sync::Arc;
 
-use compiletest::common::Mode;
-use compiletest::{log_config, parse_config, run_tests};
+use compiletest::{early_config_check, log_config, parse_config, run_tests};
 
 fn main() {
     tracing_subscriber::fmt::init();
@@ -18,18 +17,7 @@ fn main() {
 
     let config = Arc::new(parse_config(env::args().collect()));
 
-    if !config.has_html_tidy && config.mode == Mode::Rustdoc {
-        eprintln!("warning: `tidy` (html-tidy.org) is not installed; diffs will not be generated");
-    }
-
-    if !config.profiler_runtime && config.mode == Mode::CoverageRun {
-        let actioned = if config.bless { "blessed" } else { "checked" };
-        eprintln!(
-            r#"
-WARNING: profiler runtime is not available, so `.coverage` files won't be {actioned}
-help: try setting `profiler = true` in the `[build]` section of `bootstrap.toml`"#
-        );
-    }
+    early_config_check(&config);
 
     log_config(&config);
     run_tests(config);