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From: zhou@brazil.psych.purdue.edu (Albert Zhou)
Newsgroups: comp.lang.pascal
Subject: Re: Having problem with Make
Message-ID: <11677@j.cc.purdue.edu>
Date: 12 Jan 91 14:02:05 GMT
References: <91010.090837F0O@psuvm.psu.edu>
Sender: news@j.cc.purdue.edu
Reply-To: zhou@brazil.psych.purdue.edu (Albert Zhou)
Organization: Purdue University
Lines: 15

If you have modify a unit (say A) which was used by another unit (say B),
you'll have to recompile unit B when your main program use both A and B.
The compiler will not automatically recompile it for you, but it will give
you that error message you mentioned. That's because the compiled program
must only contain one copy of each subroutine in A, which will cause con-
tradition if unit A is different from the one that unit B used.

Example:

Suppose procedure anything(x: real) was in unit A which unit B used. Now
you modify it to procedure anything(x: integer). And in main program
you use this procedure in unit A. If only one copy of this procedure is
included in the compiled .EXE program, should x be integer or real?  It
can be solved only by recompile (or even modify the source code of ) unit
B.