Cmake build: Select use of interprocedural optimization

[features.git] / 3rdparty / zlib / CMakeLists.txt

diff --git a/3rdparty/zlib/CMakeLists.txt b/3rdparty/zlib/CMakeLists.txt
index a9fad6fa5453d11394fe04df5e2a038da8cf98b8..9bc1d0dbee7c1dee2ad29e23400e0359a68c0176 100644 (file)
--- a/3rdparty/zlib/CMakeLists.txt
+++ b/3rdparty/zlib/CMakeLists.txt
@@ -1,4 +1,13 @@
-cmake_minimum_required(VERSION 2.4.4)
+cmake_minimum_required(VERSION 3.1)
+
+set(LYX_IPO_SUPPORTED FALSE)
+if (POLICY CMP0069)
+  cmake_policy(SET CMP0069 NEW)
+  if (LYX_USE_IPO MATCHES "ON")
+    set(LYX_IPO_SUPPORTED YES)
+  endif()
+endif()
+
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
 
 project(zlib C)
@@ -158,4 +167,6 @@ set(ZLIB_LIBRARY zlibstatic CACHE STRING "Zlib library" FORCE)
 set(ZLIB_INCLUDE_DIR  ${SRCDIR} CACHE STRING "Zlib include dir" FORCE)
 set(ZLIB_FOUND CACHE STRING "Zlib found" FORCE )
 
-set_target_properties(zlibstatic PROPERTIES FOLDER "3rd_party")
+set_target_properties(zlibstatic PROPERTIES
+       FOLDER "3rd_party"
+       INTERPROCEDURAL_OPTIMIZATION ${LYX_IPO_SUPPORTED})