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From: davis AT space DOT mit DOT edu (John E. Davis)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Prototype Checking
Date: 11 Oct 1995 19:25:53 GMT
Organization: Center for Space Research
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On Wed, 11 Oct 1995 16:03:43 GMT, kagel AT quasar DOT bloomberg DOT com
<kagel AT quasar DOT bloomberg DOT com> wrote: 
 :        -Wmissing-prototypes
 :            Warn if a global function is defined without a previous prototype
 :            declaration.  This warning is issued even if the definition
 :            itself provides a prototype.  The aim is to detect global
 :            functions that fail to be declared in header files.

I would like to see this extended to variable declarations as well.  Let me
be more specific.  Consider two files: header.h amd file.c:

/* header.h */
extern int function_one (void);
extern int Variable_One;

/* file.c */
#include "header.h"
int Variable_One;
static int Variable_Two;
int function_one (void) { ... }
int function_two (void) { ... }
static int function_three (void) {...}


Now, if compiled with -Wmissing-prototypes, a warning is generated for
function_two saying that a previous prototype does not exist.  However,
since function_three is static, no warning is generated.  This means that
one can use -Wmissing-prototypes to see which functions should be made
static.  I would like to have the ability to do this for variables as well.
That is, I would like to see a warning for Variable_One but not for
Variable_Two.

Comments?
--John