GCC reports the following warning about ignoring the return value of
write() (to the console/UART in this instance).
common/MockUART.cpp: In function ‘void uart_do_write_char(int, char)’:
common/MockUART.cpp:67:8: warning: ignoring return value of ‘ssize_t write(int, const void*, size_t)’, declared with attribute warn_unused_result [-Wunused-result]
write(uart_nr + 1, &c, 1);
~~~~~^~~~~~~~~~~~~~~~~~~~
Add a simple warning printout to STDERR which may not be the same as the
UART stream and could succeed.
82da5c76b9