Auto merge of #133899 - scottmcm:strip-mir-debuginfo, r=oli-obk

We don't need `NonNull::as_ptr` debuginfo

In order to stop pessimizing the use of local variables in core, skip debug info for MIR temporaries in tiny (single-BB) functions.

For functions as simple as this -- `Pin::new`, etc -- nobody every actually wants debuginfo for them in the first place.  They're more like intrinsics than real functions, and stepping over them is good.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index 6e848628e5c..96d3162a8c5 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -1203,6 +1203,11 @@ impl Builder<'_> {
             // even if we're not going to output debuginfo for the crate we're currently building,
             // so that it'll be available when downstream consumers of std try to use it.
             rustflags.arg("-Zinline-mir-preserve-debug");
+
+            // FIXME: always pass this after the next `#[cfg(bootstrap)]` update.
+            if compiler.stage != 0 {
+                rustflags.arg("-Zmir_strip_debuginfo=locals-in-tiny-functions");
+            }
         }
 
         Cargo {