So I committed the patch with two modifications at revision 197168 as
* config/i386/cygwin-stdint.h: Add support for cygwin x64 target.
* config/i386/t-cygwin-w64: New file.
* config/i386/cygwin-w64.h: New file.
* config/i386/cygwin.h (EXTRA_OS_CPP_BUILTINS): Extend
and add support for x64-cygwin target.
(CPP_SPEC): Likewise.
(CXX_WRAP_SPEC_LIST): Undefine before define.
(LIBGCJ_SONAME): Use 15 as version.
First I removed useless undef in cygwin.h header. Also I removed
this version-number calculation and changed version to use 15 for
libjava's DLL.
Regards,
Kai
