I have just updated the 32bit mingw-w64 cross compilers Cygwin 32bit and
64bit to mingw64-i686-gcc-5.4.0-4.

This new update contains a patch by Martin Jambor to fix stack
adjustments on i686:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77333#c17

==== PLEASE RECOMPILE ALL YOUR C++ CODE FOR ABI COMPATIBILITY ====

The cross compiler can produce Win32 and Win64 native binaries. As a
cross compiler, you may use --host=i686-w64-mingw32 or
--host=x86_64-w64-mingw32 for autotools based source packages to build
for Windows.

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