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CMake: Re-enable LTO for Release builds with CMake >= 3.9 

If you're using an earlier version, I suggest you upgrade, CMake 3.9 was
released in 2017....
This commit is contained in:
Connor McLaughlin 2020-09-25 22:00:53 +10:00
parent e7cfc69975
commit fa46ba16bf
1 changed files with 13 additions and 1 deletions
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14
CMakeLists.txt
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@ -145,7 +145,19 @@ if(MSVC)
# Enable LTO/LTCG on Release builds.
if(${CMAKE_BUILD_TYPE} STREQUAL "Release")
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
if (${CMAKE_VERSION} VERSION_LESS "3.9.0")
message(WARNING "CMake version is less than 3.9.0, we can't enable LTCG/IPO. This will make the build slightly slower, consider updating your CMake version.")
else()
cmake_policy(SET CMP0069 NEW)
include(CheckIPOSupported)
check_ipo_supported(RESULT IPO_IS_SUPPORTED)
if(IPO_IS_SUPPORTED)
message(STATUS "Enabling LTCG/IPO.")
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
else()
message(WARNING "LTCG/IPO is not supported, this will make the build slightly slower.")
endif()
endif()
endif()
endif()