🚀 go-pugleaf

ksedgwic@netcom.COM (Ken Sedgwick) writes:

>Is there a way to make gcc require prototypes for all
>functions?

It depends a bit on what you mean.  You can use -Wimplicit to warn
about functions which are used without being declared.  You can use
-Wstrict-prototypes to warn about functions which are declared in the
old non-prototype style.  I can't think of any warning given for
functions defined (rather than declared) in the old style.

Another thing you might mean is to require a prototype for a function
definition, rather than a function use.  Here is a patch we use
locally to do exactly this when compiling with -Wstrict-prototypes.  I
sent this to RMS last year sometime, and he said something like this
would go into gcc 2.0.  The code is in #ifdef __AMOS__, which you will
want to change.  As written, it only warns about externally visible
functions (not static functions) and does not warn about the function
main.

*** ../gcc-1.40/c-decl.c	Fri Jun 14 17:19:48 1991
--- c-decl.c	Mon Jan  6 12:05:14 1992
***************
*** 1017,1022 ****
--- 1017,1035 ----
  	    }
  	  return t;
  	}
+ 
+ #ifdef __AMOS__ /* Warn for functions with no prototypes */
+       /* If this is a function definition for which no prototype has
+ 	 been seen, maybe give a warning, unless it's static.  */
+       if (t == 0
+ 	  && TREE_CODE (x) == FUNCTION_DECL
+ 	  && ! TREE_EXTERNAL (x)
+ 	  && TREE_PUBLIC (x)
+ 	  && warn_strict_prototypes
+ 	  && strcmp (IDENTIFIER_POINTER (name), "main"))
+ 	warning_with_decl (x,
+ 			   "%s: no prototype for externally visible function definition");
+ #endif /* __AMOS__ warn if no prototype */
  
        /* If declaring a type as a typedef, and the type has no known
  	 typedef name, install this TYPE_DECL as its typedef name.  */
-- 
Ian Taylor | ian@airs.com | First to identify quote wins free e-mail message:
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