Dimitrij Mijoski 1616fbaccf
[libc++] Fix checks for terminal and flushes in std::print() (#70321)
The check whether a stream is associated with a terminal or not and the
flushing of the stream in `std::print()` is needed only on Windows.
Additionally, the correct flush should be used. When `std::print` is
called with a C stream, `std::fflush()` should be used. When it is
called with C++ `ostream`, `ostream::flush()` should be called.

Because POSIX does not have a separate Unicode API for terminal output,
checking for terminal (`isatty`) and flushing is not needed at all.
Moreover, `isatty` has noticeable performance cost.

See also https://wg21.link/LWG4044.

Fixes #70142
2026-03-12 10:58:36 +01:00
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