From: peter AT agnes DOT dida DOT physik DOT uni-essen DOT de (Peter Gerwinski)
Newsgroups: comp.lang.pascal.misc,comp.os.msdos.djgpp
Subject: Re: A couple quick questions invloving GNU Pascal: Books, Accessing memory and Ports
Followup-To: comp.lang.pascal.misc,comp.os.msdos.djgpp
Date: 12 Jan 1997 11:39:25 GMT
Organization: Universitaet Essen, Germany
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Message-ID: <5baihd$3v9@sun3.uni-essen.de>
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Reply-To: peter DOT gerwinski AT uni-essen DOT de
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To: djgpp AT delorie DOT com
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> program foo;
> uses crt;  <---legal in TP & BP ;GNU ???

Parts of CRT are ported in a library `BO5'.  Check the
`contrib' subdirectory of the GNU Pascal distribution at 
ftp://kampi.hut.fi/jtv/gnu-pascal/.  From the BO5 file
`djgpp.icl' you can also learn about direct memory access etc.

It should not be too difficult to write a CRT Unit for
GNU Pascal using the stuff already in BO5.  Any volunteer
out there?

> and another thingy: TP & BP don't make OBJ's,the linking is automatic.Is
> this a feature of Pascal or just the borland products?

It is a *mis*feature of Borland Pascal that it cannot produce `.obj'
files and thus you cannot access functions written in Borland Pascal,
say, from Borland C.  However automatic linking *is* a feature of
Borland Pascal; use the commmand-line option `--automake' to get this
with GNU Pascal.

> Can I link GNU Pascal code in GCC progs?

Yes.  Just take care of the Capitalization Of The First Letter In
Each External Pascal Identifier.  E.g., if you have a Unit

    Unit Foo;

    Interface

    Function FooBar ( Var Bar: Integer ): Boolean;

    Implementation

       (* ... ! *)

    end.

then you can use the Function `FooBar' from C using the following
header `foo.h':

    #define BOOLEAN char

    extern BOOLEAN Foobar ( int *bar );

Note that this does not only work on DOS (with DJGPP or EMX) but
on *any* platform supported by GNU Pascal.

Hope this helps,

    Peter

      e-mail:  peter DOT gerwinski AT uni-essen DOT de
home address:  D\"usseldorfer Str. 35, 45145 Essen, Germany
         WWW:  http://agnes.dida.physik.uni-essen.de/~peter/