6.6.10.1 -specs=file
Process file after the compiler reads in the standard specs file, in
order to override the defaults that the xc-dsc-gcc driver program uses when determining what switches to pass
to xc-dsc-cc1, xc-dsc-as, xc-dsc-ld, etc. More than one
-specs=file can be specified on the command
line, and they are processed in order, from left to right.