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Unlike COMPILE_OPTIONS, COMPILE_DEFINITIONS CMake property assumes values without the -D prefix, such as NAME or NAME=VAL. Previously, IDF build system was passing COMPILE_DEFINITIONS build property to CMake COMPILE_OPTIONS property, so -D prefix was not a problem. Now that COMPILE_DEFINITIONS CMake property is used, -D prefix has to be removed. (Note that this doesn't affect 'target_compile_definitions' function, which strips -D prefix before adding the definition to the property.)