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This sections lists the remaining incompatibilities of GPC to BP, and the problems you might encounter when porting BP programs from 16-bit Dos to other platforms, and gives solutions for them.
By incompatibilites we mean problems that can arise when
trying to compile a valid BP program with GPC. Of course, there are
many features in GPC that BP doesn't know, but we call them
extensions unless they can break valid BP programs, so they are not
mentioned here. The subsequent sections of the Borland Pascal
chapter mention a number of useful extensions that you might want to
know about but which will not break your BP code.
Some of the differences can be “overcome” by command-line switches. As a summary:
--borland-pascal -w --uses=System -D__BP_TYPE_SIZES__ --pack-struct -D__BP_RANDOM__ -D__BP_UNPORTABLE_ROUTINES__ -D__BP_PARAMSTR_0__
But please read the following notes, and don't use these switches indiscriminately when not necessary. There are reasons why they are not GPC's defaults.