From 1c7fc3e3aee6f1f71065ce516a85bdeed71d5565 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 6 Apr 2015 14:51:01 +0000
Subject: [PATCH] Don't pass -O3 to the linker in debug builds.

This takes linking clang in a debug build with gold form 19.518925697 to
16.406388685 seconds.

llvm-svn: 234160
---
 llvm/cmake/modules/AddLLVM.cmake | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 5d906bbc1be2..af51f731ceea 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -159,8 +159,10 @@ endif()
 
 function(add_link_opts target_name)
   # Pass -O3 to the linker. This enabled different optimizations on different
-  # linkers.
-  if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32))
+  # linkers. Don't do it in debug builds since it slows down the linker
+  # in a context where the optimizations are not important.
+  if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32) AND
+     NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
     set_property(TARGET ${target_name} APPEND_STRING PROPERTY
                  LINK_FLAGS " -Wl,-O3")
   endif()