Re: How to build gcc to support wchar_t and wstring on Cygwin

[fwgx <paul dot phillips at ultra-scs dot com>]

Match Point wrote:
> 
> Hi,
> 
> wstring is not supported on my Cygwin 1.5.25. When I a declare 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 
> 

I'm having a similar issue related to using wchar_t in Cygwin trying to
build log4cxx.  Did you ever get the bottom of this issue and find a
solution?

Regards,

Paul
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