On Tue, Mar 05, 2002 at 07:38:08PM +0800, a wrote: > From: "Eric G. Miller" <egm2@jps.net> > > On Tue, Mar 05, 2002 at 03:20:12PM +0800, a wrote: > > > in my c++ program i write: > > > XtAddCallback(entry, XtNcallback, print_string, "one"); > > > > > > g++ 2.9 complains: > > > xzip.cpp: In function `int main(int, char **)': > > > xzip.cpp:35: passing `const char *' as argument 4 of > > > `XtAddCallback(_WidgetRec *, const char *, > > > void (*)(_WidgetRec *, void *, void *), void *)' discards qualifiers > > > > > > earlier g++ does not complain > > > > Well, it's a valid warning. If the callback tried to modify the > > argument... Segfault? I presume, it didn't actually cause the program > > not to compile. > > thanks! > but it's not warning; it doesn't compile.
You'll need to fix your program, then, as the function prototype of XtAddCallback() does say that the fourth argument might be modified. Perhaps put the string in a buffer somewhere rather than passing it as a constant. -- Colin Watson [EMAIL PROTECTED]
