According to Robert Ketzscher:

first of all I hope this is the right address to pose my problem.

It is. Welcome to the GNU Pascal mailing list!

I get the message Overflow in implicit constant conversion at the end of the interface part (i.e. where implementation starts). I only use a handful constants and even after I commented them out I got the same message. I wrote a small unit typedefs as follows:

unit typedefs;

interface

type longint = __long__ Integer; byte = __byte__ Integer; extended = __long__ Real; word = __short__ Integer; longstring = String[255]; shortint = __byte__ Integer;

implementation

begin end.

Is this the unit which causes problems? It compiles well with all versions of GPC I have at hand. Which version do you use?

If not, I only can guess that your problems come from initialized `Byte' variables (typed constants) initialized with values above 127 because you define `Byte' as a signed type. To get an unsigned `Byte', use

Type ByteInt = __byte__ Integer; Byte = __unsigned__ ByteInt;

If you have more problems and you are using gpc-2.0 or earlier, you should upgrade to a more recent beta version of GPC, available at ftp://agnes.dida.physik.uni-essen.de/gnu-pasal/beta/. The latest official beta release is gpc-970714; the next one is in preparation. This new GPC has the following types - and more - built in:

Type LongInt = __long__ Integer; (* 64 bits *) ShortInt = __short__ Integer; (* 16 bits; `Integer' has 32 *) ByteInt = __byte__ Integer; (* 8 bits *) LongWord = __unsigned__ LongInt; (* 64 bits, unsigned *) Word = __unsigned__ Integer; (* 32 bits, unsigned *) ShortWord = __unsigned__ ShortInt; (* 16 bits, unsigned *) Byte = __unsigned__ ByteInt; (* 8 bits, unsigned *) Extended = __long__ Real; (* 80 bits *)

Hope this helps,

Peter

Dipl.-Phys. Peter Gerwinski, Essen, Germany, free physicist and programmer peter.gerwinski@uni-essen.de - http://home.pages.de/~peter.gerwinski/ [970201] maintainer GNU Pascal [970714] - http://home.pages.de/~gnu-pascal/ [970125]