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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: PLEASE EXPLAIN v2.953
Date: Sun, 19 Dec 2004 10:11:59 CST
Organization: Rice University, Houston, TX
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> Since you are up on this, PLEASE explain why the
> %U  and %D mentioned in libc.txt (or libc.info)
> when it is actually flagged as a non-existing entity...
> What is/was the purpose of %D, %U ?

The DJGPP specific libc supports them for backward compatibility with
old DOS compilers.  The warning comes from GCC which is just giving
a helpful warning about the contents of your format string based on 
what a "standard" library should support.  It doesn't actually know
what the library will support.