compiletest: Allow using a specific debugger when running debuginfo tests

Author: clubby789

Diff for: src/tools/compiletest/src/lib.rs

@@ -37,7 +37,7 @@ use walkdir::WalkDir;
 
 use self::header::{EarlyProps, make_test_description};
 use crate::common::{
-    CompareMode, Config, Mode, PassMode, TestPaths, UI_EXTENSIONS, expected_output_path,
+    CompareMode, Config, Debugger, Mode, PassMode, TestPaths, UI_EXTENSIONS, expected_output_path,
     output_base_dir, output_relative_path,
 };
 use crate::header::HeadersCache;
@@ -183,7 +183,13 @@ pub fn parse_config(args: Vec<String>) -> Config {
             "What custom diff tool to use for displaying compiletest tests.",
             "COMMAND",
         )
-        .reqopt("", "minicore-path", "path to minicore aux library", "PATH");
+        .reqopt("", "minicore-path", "path to minicore aux library", "PATH")
+        .optopt(
+            "",
+            "debugger",
+            "only test a specific debugger in debuginfo tests",
+            "gdb | lldb | cdb",
+        );
 
     let (argv0, args_) = args.split_first().unwrap();
     if args.len() == 1 || args[1] == "-h" || args[1] == "--help" {
@@ -302,7 +308,11 @@ pub fn parse_config(args: Vec<String>) -> Config {
         stage_id: matches.opt_str("stage-id").unwrap(),
         mode,
         suite: matches.opt_str("suite").unwrap(),
-        debugger: None,
+        debugger: matches.opt_str("debugger").map(|debugger| {
+            debugger
+                .parse::<Debugger>()
+                .unwrap_or_else(|_| panic!("unknown `--debugger` option `{debugger}` given"))
+        }),
         run_ignored,
         with_rustc_debug_assertions,
         with_std_debug_assertions,
@@ -475,9 +485,16 @@ pub fn run_tests(config: Arc<Config>) {
     if let Mode::DebugInfo = config.mode {
         // Debugging emscripten code doesn't make sense today
         if !config.target.contains("emscripten") {
-            configs.extend(debuggers::configure_cdb(&config));
-            configs.extend(debuggers::configure_gdb(&config));
-            configs.extend(debuggers::configure_lldb(&config));
+            match config.debugger {
+                Some(Debugger::Cdb) => configs.extend(debuggers::configure_cdb(&config)),
+                Some(Debugger::Gdb) => configs.extend(debuggers::configure_gdb(&config)),
+                Some(Debugger::Lldb) => configs.extend(debuggers::configure_lldb(&config)),
+                None => {
+                    configs.extend(debuggers::configure_cdb(&config));
+                    configs.extend(debuggers::configure_gdb(&config));
+                    configs.extend(debuggers::configure_lldb(&config));
+                }
+            }
         }
     } else {
         configs.push(config.clone());