How to build gcc to support wchar_t and wstring on Cygwin

[Match Point <qihongwang at gmail dot com>]

Hi,

wstring is not supported on my Cygwin 1.5.25. When I  declare a
wstring variable my g++ 3.4.4 complains wstring is undeclared. After
reading some posted message I figured out wstring is not supported on
Cygwin 1.5 or even 1.7. To fix this I have to rebuild entire gcc. So I
downloaded gcc 4.4.0 and built it on my Cygwin. I didn't setup --
enable-wchar_t for libstdc++, because the default value is enabled. I
didn't have any configure options. The build was successful. But
wstring still could not pass the compilation of g++ 4.4.0. I checked
libstdc++ head file ../c++/4.4.0/i686-pc-cygwin/bits/c++config.h,
_GLIBCXX_USE_WCHAR_T
is still not defined. This leads to no "typedef basic_string<wchar_t>
wstring;" in stringfwd.h. In my c++config.h on my Linux machine with
gcc 4.1.2, _GLIBCXX_USE_WCHAR_T is defined. So I don't have wstring
support problem on Linux. My question now are
1. Is it possible to have Cygwin 1.5 or 1.7 to support wstring?
2. If it's possible how to build entire gcc or just libstdc++ if that
works. Seems like Mingw works. But I can't use that. My program have
to run on both Cygwin and Linux.

I prefer the formal approach instead of hacker one. I have a big
program which depends on other big libraries. Those libraries are also
needed to compile.

Best regards,

Qihong Wang 
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