You have same versions of cygwin1.dll and libstdc++ dll?
Wonder if it has something to do with machine, its 64 core amd threadripper
box, (128 logical cpu's with hyperthreading
Some other observations:
1) Compiling the test program on other box with older Cygwin, where problem
does not happen, and copying the .exe, still reproduces
2) With older cygwin problem goes away (I did not reinstall older cygwin, but
moved just made a directory with older cygwin1.dll and two other DLL's and the
executable and set path to it)
3) if I use fopen() problem also reproduces, but only if I include <iostream>.
The difference between executable that includes <iostream> vs one that does
not, is that the one including <iostream> links cygstdc++.6.dll and
cyggcc_s-seh-1.dll but one without does not
So problem I'm having is related to some static initialization code thats
triggered by presence of cygstdc++.6.dll, likely in the area of
ios_base::sync_with_stdio logic.
For now I'll just let this go and workaround by adding dummy
fstream("whatever") on top of my main program, if there is a real bug I'm sure
other people will hit it too sooner or later
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