On Thu, Jan 7, 2016 at 10:08 PM, Charles Campbell <[email protected]> wrote: > Hello: > > I just noticed that there's a warning when compiling with gcc under > scientific linux: > > misc2.c: In function 'put_time': > misc2.c:6312: warning: ignoring return value of 'fwrite', declared with > attribute warn_unused_result > > In grep'ing through the patches, I see this one must have creeped in > back with patch#649, which in turn was trying to get rid of an annoying > compiler message for whatever compiler Michael Jarvis used. The > solution was to use (void)fwrite(...) in the put_time() function, but > gcc v4.4.7 gets grumpy even when explicitly told not to worry by the > (void) cast. IMHO gcc should let explicitly specified ignored values go > unmentioned, but there it is. > > Presumably, given the optimization and fortify settings, the function is > prototyped with __attribute_warn_unused_result__ . > > There are two solutions: > > * apply given patch: this removes the warning using gcc at the price of > a "silly" variable assignment. I'm afraid that I wouldn't be surprised > if some compiler out there flags silly as an unused variable, though. > * specify either -U_FORTIFY_SOURCE or -D_FORTIFY_SOURCE=0 . Probably > won't want to do that, I'd guess. > > I didn't see any -W... settings to turn this message off, btw. > > Regards, > Chip Campbell
Since the compiler handles only one source file at a time, it would probably not complain for an assignment to a silly _global_ variable (visible to the linker I mean), but then the name would have to be well chosen indeed to avoid any conflict at link time. And BTW I'm not sure that proliferation of silly external names is a good idea, unless we reserve one area of memory for silly assignments in some initial module, and always assign to that whenever we would otherwise want to cast to (void). Overwriting of something we don't want to reuse is of course no problem. Best regards, Tony. -- -- You received this message from the "vim_dev" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
