From bbc66332fe8b966770290f784045b9757d66d126 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Steinbrink?= <bsteinbr@gmail.com>
Date: Sun, 24 Aug 2014 00:03:56 +0200
Subject: [PATCH] Enable the MergeFunc pass

Fixes #9536
---
 src/librustc/back/link.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index 7c2b0ba6168..9ce0e3a3357 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -536,6 +536,13 @@ pub mod write {
         llvm::LLVMPassManagerBuilderPopulateFunctionPassManager(builder, fpm);
         llvm::LLVMPassManagerBuilderPopulateModulePassManager(builder, mpm);
         llvm::LLVMPassManagerBuilderDispose(builder);
+
+        match opt {
+            llvm::CodeGenLevelDefault | llvm::CodeGenLevelAggressive => {
+                "mergefunc".with_c_str(|s| llvm::LLVMRustAddPass(mpm, s));
+            }
+            _ => {}
+        };
     }
 }