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In SPLIT build mode, nuttx_add_kernel_library(mm SPLIT) creates two targets: mm (system library) and kmm (kernel library). The compile options were being applied to the mm target via target_compile_options(mm ...), but the kasan instrumentation is compiled as part of the kmm target. Change target_compile_options(mm ...) to target_compile_options(kmm ...) so that FLAGS (including -fno-builtin and NO_LTO) are correctly applied to the kernel target where kasan code is compiled. Signed-off-by: leisiji <2265215145@qq.com>