Please add maximum_data_size parameter value (RAM size) of board to gcc call with -D option flag

Hi!

Please add a "-D option flag" for the gcc call,
to check/detect the RAM size of MCU.

e.g.: On arduino uno: -DRAMSIZE=2048
maximum_data_size=2048

Best regards

No files or tests are named. Start by locating the board configuration and the gcc invocation used for Arduino builds, then trace how each board's maximum_data_size is represented. Done means the selected board's RAM value is passed to gcc as a -D definition such as RAMSIZE=2048.

Written by the indexing model from the issue text.