[Qemu-devel] [Bug 1798659] Re: A typo in trace/simple.c

[Thomas Huth]

It's perfect valid C to terminate a statement with "," instead of ";" -
it just has a different meaning. Consider this:

#include <stdio.h>

int main()
{
    if (0)
        printf("Hello!\n"),
        
    printf("Good bye!\n");

    return 0;
}

At a first glance, you'd expect this program to print "Good bye!" - but
it does not. Actually, the "," is used here to put the two printf
statements into the same block, so this program is the same as:

    if (0) {
        printf("Hello!\n");
        printf("Good bye!\n");
    }

Thus, there is no real bug in simple.c here, but of course it would be
better style to clean this up and use ";" instead.

By the way, two lines earlier there is another line ending in ",":

    dropped.rec.event = DROPPED_EVENT_ID,

** Summary changed:

- A typo in trace/simple.c
+ Replace comma with semicolon in trace/simple.c

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https://bugs.launchpad.net/bugs/1798659

Title:
  Replace comma with semicolon in trace/simple.c

Status in QEMU:
  New

Bug description:
  In the master branch in trace/simple.c in writeout_thread 
(https://github.com/qemu/qemu/blob/master/trace/simple.c#L174) we currently 
have:
    dropped.rec.length = sizeof(TraceRecord) + sizeof(uint64_t),
    dropped.rec.pid = trace_pid;

  It seems to me like a typo that the first line ends with a comma.
  Currently this causes no harm, but I think this should be fixed.

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