From e4d30dd7f6c8b9de7eb9445717a7c314556b06da Mon Sep 17 00:00:00 2001
From: Kornel Benko <kornel@lyx.org>
Date: Tue, 30 Jul 2019 15:19:56 +0200
Subject: [PATCH] Cmake build: Disable interprocedural optimization if
 debugging

---
 3rdparty/hunspell/CMakeLists.txt |  6 +++++-
 3rdparty/mythes/CMakeLists.txt   |  6 +++++-
 CMakeLists.txt                   | 12 ++++--------
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/3rdparty/hunspell/CMakeLists.txt b/3rdparty/hunspell/CMakeLists.txt
index dfa9a287c0..ad67b43865 100644
--- a/3rdparty/hunspell/CMakeLists.txt
+++ b/3rdparty/hunspell/CMakeLists.txt
@@ -2,7 +2,11 @@
 cmake_minimum_required(VERSION 3.1)
 
 if (POLICY CMP0069)
-  cmake_policy(SET CMP0069 NEW)
+  if (LYX_DEBUG)
+    cmake_policy(SET CMP0069 OLD)
+  else()
+    cmake_policy(SET CMP0069 NEW)
+  endif()
 endif()
 
 project(hunspell)
diff --git a/3rdparty/mythes/CMakeLists.txt b/3rdparty/mythes/CMakeLists.txt
index 9457df2b73..d970ef23c3 100644
--- a/3rdparty/mythes/CMakeLists.txt
+++ b/3rdparty/mythes/CMakeLists.txt
@@ -1,7 +1,11 @@
 cmake_minimum_required(VERSION 3.1)
 
 if (POLICY CMP0069)
-  cmake_policy(SET CMP0069 NEW)
+  if (LYX_DEBUG)
+    cmake_policy(SET CMP0069 OLD)
+  else()
+    cmake_policy(SET CMP0069 NEW)
+  endif()
 endif()
 
 set(VERSION "1.2.5")
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4e2789084..f759d8f45b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,16 +81,12 @@ if(NOT help AND NOT HELP)
       message(FATAL_ERROR "Exiting")
     endif()
   endif()
-  # Enable LTO if supported
+  # Enable LTO if supported and not debugging
   if (POLICY CMP0069)
-    cmake_policy(SET CMP0069 NEW)
-    include(CheckIPOSupported)
-    check_ipo_supported(RESULT result OUTPUT reason LANGUAGES CXX)
-    if(result)
-      message(STATUS "Setting IPO True")
-      set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+    if (LYX_DEBUG)
+      cmake_policy(SET CMP0069 OLD)
     else()
-      message(STATUS "Not setting IPO , result = ${result}, reason = ${reason}")
+      cmake_policy(SET CMP0069 NEW)
     endif()
   endif()
 endif()