in the above link it seam the toolset is GNUARm eclipse that has suport for semithosting
in SW4STM32 typcial project the syscall.c is different and seam suporting the semihosting
it call __io_putchar(*ptr++);
by steping at assembly level it seam it just does nohting
maybe some lib or configuration is missing to get the io done via semihosting ?
i’m also interested in using semihotsing (with posibility to switch it on and off ) so i’ll folow your thread