From d9531a0d93f63a8e67e56419e0aadf25a0edd43a Mon Sep 17 00:00:00 2001
From: Gary Guo <gary@garyguo.net>
Date: Wed, 7 Jun 2023 21:00:56 +0100
Subject: [PATCH] Remove wrongly emitted `.eh_frame` in `-Cpanic=abort`

---
 compiler/rustc_mir_transform/src/check_alignment.rs |  7 ++++++-
 tests/run-make/panic-abort-eh_frame/Makefile        | 10 ++++++++++
 tests/run-make/panic-abort-eh_frame/foo.rs          | 10 ++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 tests/run-make/panic-abort-eh_frame/Makefile
 create mode 100644 tests/run-make/panic-abort-eh_frame/foo.rs

diff --git a/compiler/rustc_mir_transform/src/check_alignment.rs b/compiler/rustc_mir_transform/src/check_alignment.rs
index 1fe8ea0789286..ef64f70fdf349 100644
--- a/compiler/rustc_mir_transform/src/check_alignment.rs
+++ b/compiler/rustc_mir_transform/src/check_alignment.rs
@@ -9,6 +9,7 @@ use rustc_middle::mir::{
 };
 use rustc_middle::ty::{Ty, TyCtxt, TypeAndMut};
 use rustc_session::Session;
+use rustc_target::spec::PanicStrategy;
 
 pub struct CheckAlignment;
 
@@ -236,7 +237,11 @@ fn insert_alignment_check<'tcx>(
                 required: Operand::Copy(alignment),
                 found: Operand::Copy(addr),
             }),
-            unwind: UnwindAction::Terminate,
+            unwind: if tcx.sess.panic_strategy() == PanicStrategy::Unwind {
+                UnwindAction::Terminate
+            } else {
+                UnwindAction::Unreachable
+            },
         },
     });
 }
diff --git a/tests/run-make/panic-abort-eh_frame/Makefile b/tests/run-make/panic-abort-eh_frame/Makefile
new file mode 100644
index 0000000000000..1cb7bf575cbdf
--- /dev/null
+++ b/tests/run-make/panic-abort-eh_frame/Makefile
@@ -0,0 +1,10 @@
+# only-linux
+#
+# This test ensures that `panic=abort` code (without `C-unwind`, that is) should not have any
+# unwinding related `.eh_frame` sections emitted.
+
+include ../tools.mk
+
+all:
+	$(RUSTC) foo.rs --crate-type=lib --emit=obj=$(TMPDIR)/foo.o -Cpanic=abort
+	objdump --dwarf=frames $(TMPDIR)/foo.o | $(CGREP) -v 'DW_CFA'
diff --git a/tests/run-make/panic-abort-eh_frame/foo.rs b/tests/run-make/panic-abort-eh_frame/foo.rs
new file mode 100644
index 0000000000000..e185352945538
--- /dev/null
+++ b/tests/run-make/panic-abort-eh_frame/foo.rs
@@ -0,0 +1,10 @@
+#![no_std]
+
+#[panic_handler]
+fn handler(_: &core::panic::PanicInfo<'_>) -> ! {
+    loop {}
+}
+
+pub unsafe fn oops(x: *const u32) -> u32 {
+    *x
+}