🚀 go-pugleaf

In article <55192@sophia.inria.fr>, Lionel Mallet <mallet@gaia.inria.fr> wrote:
>Assume the following C file (foo.c):
>#include <X11/Intrinsic.h>
>XtCallbackProc foo(Widget w, XtPointer client_data, XtPointer call_data)
>{
>	/* nothing inside */
>}
>When compiling this code with gcc -Wall I get the following message:
>mallet@skye% gcc -c -v -Wall foo.c
>foo.c: In function `foo':
>foo.c:6: warning: control reaches end of non-void function
>But in fact my function *IS* declared as returning void as the XtCallbackProc 
>type is a typedef of this kind:
>typedef void (*XtCallbackProc)(
>#if NeedFunctionPrototypes
>    Widget              /* widget */,
>    XtPointer           /* closure */,  /* data the application registered */
>    XtPointer           /* call_data */ /* callback specific data */
>#endif
>);

So foo() is returning an XtCallbackProc, which is definitely not
equivalent to void. foo() is returning a pointer to a function
that returns void.

I think what you mean is:

void foo(Widget w, XtPointer client_data, XtPointer call_data) {
}

XtCallbackProc bar = foo;

	-Don

\-----------------------------------------------------------------------/
| Don Erway			   			 derway@ndc.com	|
| NDC Systems								|
| Monrovia, CA			   Opinions expressed herein apparently	|
| (Somewhere Near Pasadena)	   spontaneously organized  themselves.	|
/-----------------------------------------------------------------------\