From:	"A.Appleyard" <A DOT APPLEYARD AT fs2 DOT mt DOT umist DOT ac DOT uk>
Organization:	Materials Science Centre
To:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>, DJGPP AT delorie DOT com
Date:	Mon, 24 Feb 1997 15:50:44 GMT
Subject:	Re: How to find all references?
Message-ID:	<334FBF9568F@fs2.mt.umist.ac.uk>

  A.Appleyard asked "how to find unused global variables and functions in a
big multi-file program"?

  Eli Zaretski replied:-
> ... using optimization switches makes gcc warn about more unused stuff, so
> try it.

  I tried this:-
  redir -o ++ -e + gcc main.cc display.cc macros.cc keyf.cc em.cc cc.cc zip.cc
-lpc -O2 -Wall               (as all one line)
  It gave 38 warnings of the type "variable `class line * J' might be
clobbered by `longjmp' or `vfork'" and 2 of the type "`int m' might be used
uninitialized in this function". I did this before, and examination of my
logic showed that the compiler's fears were unjustified.

  Eli Zaretski replied:-
> How about grep: can you look at all the places the variables and functions
> are mentioned, then see whether any of them is a function call (for a
> function) or if a variable is getting a value?

  But I use functions and variables in hundreds of places!

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