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Use native instruction set on build system

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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.
This commit is contained in:
Roland Kaufmann 2012-12-12 10:13:09 +01:00
parent 31fae50628
commit 7976b95983
1 changed files with 9 additions and 0 deletions
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9
cmake/Modules/UseOptimization.cmake
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@ -23,6 +23,15 @@ if (CMAKE_COMPILER_IS_GNUCXX)
list (APPEND _opt_flags "-flto")
endif (HAVE_LINK_OPTS)
# native instruction set tuning
option (WITH_NATIVE "Use native instruction set" ON)
if (WITH_NATIVE)
check_cxx_accepts_flag ("-mtune=native" HAVE_MTUNE)
if (HAVE_MTUNE)
list (APPEND _opt_flags "-mtune=native")
endif (HAVE_MTUNE)
endif (WITH_NATIVE)
# use these options for release builds - full optimization
add_options (
ALL_LANGUAGES