From a17c3c7ca9a53b31e9ed0c8332031ffc17c1eebe Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Sun, 18 Feb 2018 00:27:57 +0300
Subject: [PATCH] Disable LTO by default. Add CMake option TD_ENABLE_LTO to
 enable it.

GitOrigin-RevId: 53fd2d4573946bfac27c10953874f96b2e8491d1
---
 CMakeLists.txt | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 211db32f..34d0d6ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,14 +16,18 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 enable_testing()
 
 if (POLICY CMP0069)
-  cmake_policy(SET CMP0069 NEW)
-  include(CheckIPOSupported)
-  check_ipo_supported(RESULT IPO_SUPPORTED)
-  if (IPO_SUPPORTED)
-    #set_property(DIRECTORY PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE) do not work?
-    string(REPLACE ";" " " CXX_FLAGS_IPO "${CMAKE_CXX_COMPILE_OPTIONS_IPO}")
-    message(STATUS "Use link time optimizations: ${CXX_FLAGS_IPO}")
-    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CXX_FLAGS_IPO}")
+  option(TD_ENABLE_LTO "Use \"ON\" to enable Link Time Optimization.")
+
+  if (TD_ENABLE_LTO)
+    cmake_policy(SET CMP0069 NEW)
+    include(CheckIPOSupported)
+    check_ipo_supported(RESULT IPO_SUPPORTED)
+    if (IPO_SUPPORTED)
+      #set_property(DIRECTORY PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE) do not work?
+      string(REPLACE ";" " " CXX_FLAGS_IPO "${CMAKE_CXX_COMPILE_OPTIONS_IPO}")
+      message(STATUS "Use link time optimizations: ${CXX_FLAGS_IPO}")
+      set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${CXX_FLAGS_IPO}")
+    endif()
   endif()
 endif()