CMAKE_<LANG>_GHS_KERNEL_FLAGS_MINSIZEREL
GHS kernel flags for MinSizeRel build type or configuration.
<LANG> flags used when CMAKE_BUILD_TYPE is MinSizeRel (short for minimum size release).
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https://cmake.org/cmake/help/v3.5/variable/CMAKE_LANG_GHS_KERNEL_FLAGS_MINSIZEREL.html