SetupOptimizationLevel.cmake

#################################################################################
# Setup compiler flags to enable or disable optimization
# By default: Release with -O3, Debug -O0
#################################################################################

# make sure a build type is set, default to release
if (NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif ()
message("-- Using Build Type: " ${CMAKE_BUILD_TYPE})


# Enable optimizations in release builds
if (CMAKE_BUILD_TYPE STREQUAL "Release")
    # Link time optimization
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
    # -O2 is often seen as 'the most speed',
    # but inlining functions and SIMD/Vectorization is
    # only enabled by -O3, thus it's way faster in some
    # array calculations.
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -march=native")
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
else ()
    set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
endif ()