From 2e8f7051e4714f51ecc9e1eaeb5af878fbd5d262 Mon Sep 17 00:00:00 2001
From: Josh Triplett <josh@joshtriplett.org>
Date: Thu, 1 Oct 2020 11:13:13 -0700
Subject: [PATCH] Add comment explaining why libunwind doesn't need to link
 libgcc_eh

---
 library/unwind/src/lib.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/library/unwind/src/lib.rs b/library/unwind/src/lib.rs
index d34abb7e73dba..e7fa37bc9db19 100644
--- a/library/unwind/src/lib.rs
+++ b/library/unwind/src/lib.rs
@@ -42,6 +42,9 @@ cfg_if::cfg_if! {
 #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
 extern "C" {}
 
+// When building with crt-static, we get `gcc_eh` from the `libc` crate, since
+// glibc needs it, and needs it listed later on the linker command line. We
+// don't want to duplicate it here.
 #[cfg(all(target_os = "linux", target_env = "gnu", not(feature = "llvm-libunwind")))]
 #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
 extern "C" {}