🚀 go-pugleaf

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
Reading specs from /usr/local/lib/gcc-lib/sparc-sun-sunos4.1.1/2.4.5/specs
gcc version 2.4.5
 /usr/local/lib/gcc-lib/sparc-sun-sunos4.1.1/2.4.5/cpp -lang-c -v -undef
-D__GNU
C__=2 -Dsparc -Dsun -Dunix -D__GCC_NEW_VARARGS__ -D__sparc__ -D__sun__
-D__unix_
_ -D__GCC_NEW_VARARGS__ -D__sparc -D__sun -D__unix -D__GCC_NEW_VARARGS__ -Wall
f
oo.c /usr/tmp/cca12774.i
GNU CPP version 2.4.5 (sparc)
 /usr/local/lib/gcc-lib/sparc-sun-sunos4.1.1/2.4.5/cc1 /usr/tmp/cca12774.i
-quie
t -dumpbase foo.c -Wall -version -o /usr/tmp/cca12774.s
GNU C version 2.4.5 (sparc) compiled by GNU C version 2.4.5.
foo.c: In function `foo':
foo.c:6: warning: control reaches end of non-void function
 as -o foo.o /usr/tmp/cca12774.s
mallet@skye%

I assume that strange warning is telling me that I should have add a return 
statement cause my function is not declared as returning void.

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
);

Is it that gcc cannot properly handle function's typedefs or am I doing
something 
wrong?

Any help would be greatly appreciated.
-- 
     Lionel Mallet - mallet@simpolis.fr - Simulog - FRANCE