GPC supports "ISO-7185 Standard Pascal (level 0 and level 1)" and large parts of "ISO-10206 Extended Pascal".
Yes. See the online documentation or the ISO Standards themselves (a link is on our home page).
Someone (at Slashdot?) uses to quote Tanenbaum:
"I like standards, there are so many to choose from"
Will try to find out and poke a bit on this one:
--standard-pascal
Thanks for the references! Marc