4.6.1.4 Config Option

The -mconfig option can be used to have the compiler program default values for those configuration bits that have not been specified in the code using the config pragma. The alternate form of this option is -mdefault-config-bits.

The default operation is to not program unspecified bits, and this can be made explicit using the -mno-config option (or its equivalent, -mno-default-config-bits).