Skip `dsymutil` by default for compiler bootstrap

`dsymutil` adds time to builds on Apple platforms for no clear benefit, and also
makes it more difficult for debuggers to find debug info. The compiler currently
defaults to running `dsymutil` to preserve its historical default, but when
compiling the compiler itself, we skip it by default since we know it's safe to
do so in that case.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs
index 9af79e20630..ab0c4a5c31b 100644
--- a/src/bootstrap/builder.rs
+++ b/src/bootstrap/builder.rs
@@ -1126,6 +1126,19 @@ impl<'a> Builder<'a> {
             },
         );
 
+        // `dsymutil` adds time to builds on Apple platforms for no clear benefit, and also makes
+        // it more difficult for debuggers to find debug info. The compiler currently defaults to
+        // running `dsymutil` to preserve its historical default, but when compiling the compiler
+        // itself, we skip it by default since we know it's safe to do so in that case.
+        // See https://github.com/rust-lang/rust/issues/79361 for more info on this flag.
+        if target.contains("apple") {
+            if self.config.rust_run_dsymutil {
+                rustflags.arg("-Zrun-dsymutil=yes");
+            } else {
+                rustflags.arg("-Zrun-dsymutil=no");
+            }
+        }
+
         if self.config.cmd.bless() {
             // Bless `expect!` tests.
             cargo.env("UPDATE_EXPECT", "1");