On Fri, Nov 13, 2020 at 11:21:12PM -0500, cygwin wrote: > On Fri, Nov 13, 2020 at 10:45 PM Duncan Roe <duncan_...@optusnet.com.au> > wrote: > > > Hi William, > > > > On Fri, Nov 13, 2020 at 12:27:57PM -0500, cygwin wrote: > > > I've run into a problem running a collection of tests under Cygwin and I > > > wonder if anyone can suggest a way around it. > > > > > > The problem occurs when a program being run fails a C/C++ runtime > > > assertion. Ordinarily, this just writes an error message on stderr and > > > aborts. Under Cygwin, however, if both stdin and stderr are redirected to > > > files, the program instead pops up a dialog box that must be > > interactively > > > dismissed before the failed program will exit - holding up all the tests > > > that follow it. > > > > > > Specifically, if I have the following as assert.cpp: > > > > > > #include <assert.h> > > > int main() { > > > assert(false); > > > } > > > > > > and say > > > > > > gcc assert.cpp > > > ./a.exe < /dev/null > output 2>&1 > > > > > > I get an error dialog box saying > > > > > > Failed assertion > > > false > > > at line 3 of file assert.cpp > > > in function int main() > > > > > > If I omit either the stdin or the stderr redirection, the program behaves > > > as desired with no dialog box. > > > > > > Is there an environment setting or compiler command-line option I can > > give > > > to suppress the dialog box and always just write a message to stderr and > > > abort? Thanks for any insights. > > > > Your example WFFM, (Cygwin64, gcc 10.2.0, everything else also up to date). > > > > Do you still see this behaviour if you run the installer? > > > > Thanks for your reply; unfortunately, yes, it does. I had refreshed > the installation fairly recently, and running the installer only updated a > few things, not cygwin.dll and not gcc; my installation is the same as > yours. I've tried it with three different shells (tcsh, bash, mksh) and > with both gcc and clang, and all have the same behavior. (Interestingly, if > I compile the example with MSVC and run it in a Cygwin shell, it does _not_ > pop up an error dialog box, so presumably it's in the Cygwin runtime, > specifically the definition of __assert_func.) > > -- > William M. (Mike) Miller | Edison Design Group > william.m.mil...@gmail.com
Sorry, should have mentioned running on Win7 Home. When I try it on my wife's Win10 system, I get the dialog box same as you. Cheers ... Duncan. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple