0bc199fc5d
This replaces uses of BUFSIZ with a new _GLIBCXX_BUFSIZ macro that can be overridden in target-specific config headers. That allows the mingw and mingw-w64 targets to override it, because BUFSIZ is apparently defined to 512, resulting in poor performance. The MSVCRT stdio apparently uses 4096, so we use that too. libstdc++-v3/ChangeLog: PR libstdc++/94268 * config/os/mingw32-w64/os_defines.h (_GLIBCXX_BUFSIZ): Define. * config/os/mingw32/os_defines.h (_GLIBCXX_BUFSIZ): Define. * include/bits/fstream.tcc: Use _GLIBCXX_BUFSIZ instead of BUFSIZ. * include/ext/stdio_filebuf.h: Likewise. * include/std/fstream (_GLIBCXX_BUFSIZ): Define.
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