Failed assertion dialog box

[Duncan Roe]

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.
>
> --
> William M. (Mike) Miller | Edison Design Group
> william.m.miller@gmail.com
> --

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?

Cheers ... Duncan.