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Hi! #include <stdio.h> int main(void) { putc('1', stderr); putc('2', stderr); } does not work properly in glibc 2.1.91 ('2' is not printed at all). Seems like '2' is just recorded into the write buffer in _IO_putc_unlocked (glibc 2.1 does the same, I wonder though, is it right when the FILE is unbuffered?), so most probably just exit optimizes and does not flush unbuffered streams. fflush(stderr) after the last putc helps, BTW. Jakub
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