7976b95983
CMake files are in general not portable between systems anyway, so we may as well take full advantage of the native instruction set. There must be a companion option to switch this off in case anyone wants to build a package for distribution.
42 lines
1.1 KiB
CMake
42 lines
1.1 KiB
CMake
# - Turn on optimizations based on build type
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include(TestCXXAcceptsFlag)
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include (AddOptions)
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# if we are building a debug target, then disable all optimizations
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# otherwise, turn them on. indicate to the code what we have done
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# so it can turn on assertions etc.
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if (CMAKE_COMPILER_IS_GNUCXX)
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# use these options for debug builds - no optimizations
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add_options (
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ALL_LANGUAGES
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"Debug"
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"-O0" "-DDEBUG"
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)
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# extra flags passed for optimization
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set (_opt_flags "")
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# link-time (a.k.a. global) optimizations
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check_cxx_accepts_flag ("-flto" HAVE_LINK_OPTS)
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if (HAVE_LINK_OPTS)
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list (APPEND _opt_flags "-flto")
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endif (HAVE_LINK_OPTS)
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# native instruction set tuning
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option (WITH_NATIVE "Use native instruction set" ON)
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if (WITH_NATIVE)
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check_cxx_accepts_flag ("-mtune=native" HAVE_MTUNE)
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if (HAVE_MTUNE)
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list (APPEND _opt_flags "-mtune=native")
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endif (HAVE_MTUNE)
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endif (WITH_NATIVE)
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# use these options for release builds - full optimization
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add_options (
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ALL_LANGUAGES
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"Release;RelWithDebInfo;MinSizeRel"
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"-O3" "-DNDEBUG" ${_opt_flags}
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)
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endif (CMAKE_COMPILER_IS_GNUCXX)
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