[avr-libc-dev] [bug #52181] assert should make Serial.flush() before calling abort()

[Hannes Studeny]

URL:
  <http://savannah.nongnu.org/bugs/?52181>

                 Summary: assert should make Serial.flush() before calling
abort()
                 Project: AVR C Runtime Library
            Submitted by: pukuri
            Submitted on: Sat 07 Oct 2017 02:58:08 AM UTC
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: libc code
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Any
           Fixed Release: None

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Details:

I'm quite new to this project, hopefully I'm submitting this bug at the corect
place, if not, please point me in the right direction...

if the expression in the assert function fails, a fprintf to stderr is made
and then the function abort() is called which runs in an endless loop.

The problem is, because the abort() function disables all interrupts (which is
fine), the remaining bytes in the buffer for the serial interface will not be
printed (not so good). Only the very first couple of bytes will be seen.

recomended solution: just before calling abort think about calling
Serial.flush(), or similar...

Problem with this solution is, that Serial.flush comes from the Arduino
environment and has nothing to do with libc, but on the other hand fflush()
does nothing

So, I have no real solution for this problem, but hopefully the insiders might
come up with something.

Right now the assert function is useless, because one get no information where
and why the program stops.




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