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Re: [Qemu-trivial] [Qemu-devel] [PATCH] trace/simple: Fix warning and wr

From: Eric Blake
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] trace/simple: Fix warning and wrong trace file name for MinGW
Date: Mon, 28 Sep 2015 09:50:31 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

On 09/28/2015 09:19 AM, Stefan Weil wrote:
> 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.

If getpid() always returns int, then defining pid_t to __int64 feels
wrong.  I still claim its a mingw bug to have a mismatch in types.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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