[Bug libstdc++/43738] basic_file_stdio.cc uses ioctl on a fd, but not available on mingw32

[sherpya at netfarm dot it]

------- Comment #7 from sherpya at netfarm dot it  2010-04-15 10:03 -------
the correct way should be
#if defined(FIONREAD) && !defined(_WIN32)

or if you prefer __MINGW32__

(note _WIN32 is not defined on cygwin)

ioctlsocket is not suitable because it does not work on file descriptors
also it will need ws2_32 library at link time


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43738