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The higher-level input/output, such as the functions
and the C++ object
std::cout, are not target-dependent.
However, the higher-level functions perform input/output by calling
lower-level functions that are target-dependent. To retarget input/output,
you can either avoid these higher-level functions or redefine the lower-level
rt_sys.h for more information on
See also Writing reentrant and thread-safe code.