From 02249e813ebb93d41f1a745a2836212ec8f68c8f Mon Sep 17 00:00:00 2001
From: Robin Kruppe <robin.kruppe@gmail.com>
Date: Mon, 28 Nov 2016 12:23:57 +0100
Subject: [PATCH] Define VISIBILITY_HIDDEN when compiling compiler-rt

This is cherry-picked from #37817 which seems to be stalled and currently needs to be rebased anyway.

r? @alexcrichton (who authored this change)
---
 src/libcompiler_builtins/build.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libcompiler_builtins/build.rs b/src/libcompiler_builtins/build.rs
index acbd39bb1630c..f61e2281a5c30 100644
--- a/src/libcompiler_builtins/build.rs
+++ b/src/libcompiler_builtins/build.rs
@@ -94,6 +94,7 @@ fn main() {
         cfg.flag("-fvisibility=hidden");
         cfg.flag("-fomit-frame-pointer");
         cfg.flag("-ffreestanding");
+        cfg.define("VISIBILITY_HIDDEN", None);
     }
 
     let mut sources = Sources::new();