GCC 7.1, cygwin, undefined reference to ___divmoddi4

[Thomas Plank]

JonY wrote:
> Looks like something wrong with libgcc? Check the libgcc symbols from
> 7.1.0 and the installed version. Not sure if you can workaround by
> installing libgcc first.
>
I solved in in the way, that I took the oppurtunity to switch to 
cygwin64 and start completely from scratch.
So my ~15 year old cygwin installation got refreshed.

Compilation worked with the new setup without problems.