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GNU GPC is such a compiler. It will take switches that configure it for either ISO 7185 use or Borland use. Note that several of the differences between the languages are compatible between the languages without the need for an option. Here is a list of ISO 7185 to Delphi differences, and whether they require a configuration option, and why. See the section "Differences between the languages", for details on each difference.
1. Procedure and function parameters.
Requires a configuration option: No
Reason: In delphi mode, the keyword procedure or function in a procedure or function header is an error. In ISO 7185 Pascal, it introduces a procedure or function parameter. This makes it essentially an extension to Delphi.
2. Interprocedural gotos.
Requires a configuration option: No
Reason: Such gotos cause an error in Delphi, so it behaves as simple extension.
3. File buffer access, "get" and "put" procedures.
Requires a configuration option: No
Reason: There are no get or put procedures in Delphi, and access to a file variable is illegal, so both of these act as simple extensions.
4. Sized variant record allocation.
Requires a configuration option: No
Reason: Allocating a variant record with new with Delphi is illegal, so it behaves as a simple extension.
5. "pack" and "unpack" functions.
Requires a configuration option: No
Reason: There are no pack or unpack procedures in Delphi, so it behaves as a simple extension. Note that in most cases, pack and unpack don't need to actually do anything, since arrays are allocated to the nearest byte on most microprocessors.
6. { and (*, } and *) are not synonyms.
Requires a configuration option: Yes
Reason: There is no way to have a single behavior that covers both the ISO 7185 and Delphi definition of how comments work.
7. Requires compiler directives to make a standard program.
Requires a configuration option: No
Reason: The compiler can simply ignore this comment.
8. End of line returns ASCII codes.
Requires a configuration option: Yes (or a different runtime library)
Reason: There is no way to satisfy both program standards. An eoln is either a space or the underlying ASCII characters.
9. Default field widths.
Requires a configuration option: Yes (or a different runtime library)
Reason: The basic behavior of the compiler must be changed.
So of the 9 basic differences between the standards, 3 of them are mutually incompatible between the two languages, and require options to change the basic workings of the compiler. The 6 remaining differences that are simply additions to the Delphi language can also be thought of as "freebies" that can be added to any Delphi compatible compiler in order to enable it to be closer to the ISO 7185 standard without compromising its Delphi processing in any way.
