From 32d1a4b025716727bb9b350fcbddaad16ee1ab17 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@google.com>
Date: Tue, 5 May 2020 12:41:23 -0700
Subject: [PATCH] Use -fvisibility=hidden for libunwind

We don't want to export any symbols from Rust's version of libunwind
as these may collide with other copies of libunwind e.g. when linking
Rust staticlib together C/C++ libraries that have their own version.
---
 src/libunwind/build.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libunwind/build.rs b/src/libunwind/build.rs
index c8d2419ab4514..1462639259cb8 100644
--- a/src/libunwind/build.rs
+++ b/src/libunwind/build.rs
@@ -89,6 +89,7 @@ mod llvm_libunwind {
             cfg.flag("-fno-rtti");
             cfg.flag("-fstrict-aliasing");
             cfg.flag("-funwind-tables");
+            cfg.flag("-fvisibility=hidden");
         }
 
         let mut unwind_sources = vec![