printf before assert doesn't work

Question

I think I've seen this issue before and I bet there's better solution out there so asking..

During debugging I found that any printf before assert don't work well. They're simply not printed most of the time. I tried adding fflush(stdout ) but it doesn't seem to help.

Any other thoughts or alternatives?

Example:

printf... <- not printed
printf... <- not printed due to the assert. stdout not flushed?

do something

assert()

Answer 1

Call fflush(stdout) before assert . Or, if stdout has not been redirected and refers to the terminal, just writing a newline at the end of your message should be sufficient. By default, stdout is buffered (line buffered on terminals; fully buffered otherwise) and thus output will not actually be written until the output buffer overflows or a newline (in line-buffered mode) or fflush is encountered.

Answer 2

您是否正在进行优化编译-因为printfs / assert的实际顺序可能不符合您的期望。