From bcde3b0e5396f3ea560d3429b8fab1d69a18a55a Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Thu, 14 Jul 2016 12:54:41 +0100
Subject: [PATCH] [Feature] Use -flto if possible when optimizations are
 enabled

---
 CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22704af4e..5d126659d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -793,7 +793,13 @@ ENDIF(SUPPORT_FPIC)
  # Optimization flags
 IF(NOT CMAKE_C_OPT_FLAGS)
 	IF(ENABLE_OPTIMIZATION MATCHES "ON")
-		SET(CMAKE_C_OPT_FLAGS "-O3 -fstrict-aliasing")
+		CHECK_C_COMPILER_FLAG(-flto SUPPORT_FLTO)
+		IF(SUPPORT_FLTO)
+			SET(CMAKE_C_OPT_FLAGS "-O3 -fstrict-aliasing -flto")
+			SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -flto")
+		ELSE()
+			SET(CMAKE_C_OPT_FLAGS "-O3 -fstrict-aliasing")
+		ENDIF()
 	ELSE(ENABLE_OPTIMIZATION MATCHES "ON")
 		IF(DEBUG_MODE MATCHES "ON")
 			SET(CMAKE_C_OPT_FLAGS "-g -O0 -fstrict-aliasing")
-- 
2.39.5