SetupOptimizationLevel.cmake 952 Bytes
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#################################################################################
# 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
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if (NOT CMAKE_BUILD_TYPE)
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    set(CMAKE_BUILD_TYPE Release)
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endif ()
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message("-- Using Build Type: " ${CMAKE_BUILD_TYPE})


# Enable optimizations in release builds
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if (CMAKE_BUILD_TYPE STREQUAL "Release")
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    # Link time optimization
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    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
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    # -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.
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    set(CMAKE_CXX_FLAGS_RELEASE "-O2 -march=native")
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    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
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else ()
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    set(CMAKE_CXX_FLAGS_DEBUG "-g -O0")
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endif ()