I would like to implement a gcc plugin that can compress an __attribute__((format(printf, x, y))) const char array before storage so that the formats can be size reduced when stored and expanded appropriately before use.
As this is the first plugin I am trying to implement, I'm a bit lost in details and I am looking for guidance. Basically: Take the printf_format_type CONST_DECL format being verified by gcc/c-format-main.c and after the verification, compress the format and its length before storage into its .read_only section. A custom vsnprintf routine would expand the compressed format to its original form before use. All tips to necessary gcc plugin implementation details appreciated.
