Re: [Qemu-trivial] [Qemu-devel] [PATCH] trace/simple: Fix warning and wrong trace file name for MinGW

[Stefan Weil]

Am 28.09.2015 um 17:06 schrieb Eric Blake:
> On 09/28/2015 02:26 AM, Stefan Weil wrote:
>
>>> Can you explain why osdep.h's
>>>
>>>     #define FMT_pid "%" PRId64
>>>
>>> is appropriate for Windows?
>> Don't blame me for any strangeness which you might find in Windows. :-)
>>
>> Mingw-w64 sys/types.h defines pid_t to be either an int or an __int64.
>> FMT_pid must match these definitions.
>>
>> But getpid returns an int, not a pid_t...
> Can we 1) file a bug against mingw for their buggy getpid(), and 2)
> write a wrapper that makes getpid() always return pid_t in the meantime?

1) No, because MinGW and Mingw-w64 use the same declaration as MS.
They cannot change that, of course. Nor will MS correct this after many
years, for obvious reasons.

2) We could use a wrapper qemu_getpid or #define getpid() ((pid_t)getpid()).
But that would require several other code changes.