> From: Achim Gratz > To: cygwin > Cc: > Date: 2019/3/6, Wed 04:24 > Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4) > >T atsuro MATSUOKA writes: >> I contacted with Enrico who tells me the patch that I have shown. > > Yes, but that monkeys around the real problem. What Yaakov is telling > you is that there are two options and we don't know yet which one we > have to deal with. > > If O_NONBLOCK is needed, but does not work correctly under Cygwin, then > that's a bug in Cygwin. For this case, Corinna asks you to create an > STC that demonstrates the bug so it can be triaged without having to > work with something as complex as the Qt terminal in Cygwin. > > If on the other hand O_NONBLOCK is in fact not needed and just shows > different behaviour on different systems without a bug in the > implementation being present, then upstream should remove that argument. > > > Regards, > Achim.
Here I desribe another discussion on Bug tracker on gnuplot https://sourceforge.net/p/gnuplot/bugs/2147/ My summary from searching through the history shown in the links above: * gnuplot calls QLocalSocket::connectToServer("name") * Qt tries to open a named pipe for the socket using O_NONBLOCK * This fails because Cygwin has problems with non-blocking named pipes. Back in 2010 Enrico Forestieri posted some simple examples of this (standalone tests, no involvement of gnuplot code) but this apparently did not lead to a fix. * the Qt patch at the head of this bug report would make gnuplot work, but needs to be wrapped in a conditional test for CYGWIN. I can understand why upstream Qt would not want to deal with this. Conclusion: We probably can't fix it in the gnuplot code. There is a trivial work-around that requires modifying the Qt source code, but this would only make sense for the purpose of making a Qt package specifically for Cygwin. Tatsuro -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
