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CMake: fix LTO on Linux

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LTO/IPO with non-Intel compilers on Linux requires policy CMP0069 to be set to NEW.
Set it explicitly until cmake_minimum_required is raised to >= 3.9

Also explicitly check whether the current environment actually supports IPO.
This commit is contained in:
Maximilian Federle 2020-10-21 00:07:32 +02:00 committed by phkahler
parent f3f33d3f26
commit 8a2e77d035
1 changed files with 7 additions and 0 deletions
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7
CMakeLists.txt
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@ -11,6 +11,11 @@ cmake_minimum_required(VERSION 3.7.2 FATAL_ERROR)
if(NOT CMAKE_VERSION VERSION_LESS 3.11.0) if(NOT CMAKE_VERSION VERSION_LESS 3.11.0)
cmake_policy(VERSION 3.11.0) cmake_policy(VERSION 3.11.0)
endif() endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.9)
# LTO/IPO with non-Intel compilers on Linux requires policy CMP0069 to be set to NEW.
# Set it explicitly until cmake_minimum_required is raised to >= 3.9.
cmake_policy(SET CMP0069 NEW)
endif()
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
"${CMAKE_SOURCE_DIR}/cmake/") "${CMAKE_SOURCE_DIR}/cmake/")
set(CMAKE_CXX_STANDARD 11) set(CMAKE_CXX_STANDARD 11)
@ -102,6 +107,8 @@ if(CMAKE_SYSTEM_PROCESSOR STREQUAL "i686" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "X8
endif() endif()
if(ENABLE_LTO) if(ENABLE_LTO)
include(CheckIPOSupported)
check_ipo_supported()
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE) set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
endif() endif()