[CMakeLists.txt] Fix BUILD_ARCH option#5
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The CMake option function is intended for ON/OFF operations. When using "native" as a default, option would set BUILD_ARCH to "OFF" if not used on the command line. This would cause the build architecture detection to fail. In this fix the option function is used properly and, if not used on the command line, sets a default of "native". Also, if neither -march or -mcpu work successfully, "native" is used as a fall-back.
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@ztuowen The BUILD_ARCH option was buggy when the default of 'native' was suppose to be selected. This fixes it. |
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The CMake option function is intended for ON/OFF operations. When using
"native" as a default, option would set BUILD_ARCH to "OFF" if not used
on the command line. This would cause the build architecture detection
to fail.
In this fix the option function is used properly and, if not used on the
command line, sets a default of "native". Also, if neither -march or
-mcpu work successfully, "native" is used as a fall-back.