Re: VS 2015 support in src/tools/msvc

I wrote:
> Andrew Dunstan <andrew@dunslane.net> writes:
>> On 04/23/2016 05:30 PM, Christian Ullrich wrote:
>>> In this case, I would prefer this:
>>> 
>>> #ifdef WIN32_ONLY_COMPILER
>>> -typedef int pid_t;
>>> +typedef intptr_t pid_t;
>>> #endif

>> That's a change that will have a pretty wide effect. Everything up to 
>> now has been pretty low risk, but this worries me rather more. Maybe 
>> it's safe, but I'd like to hear others' comments.

> Yeah, it makes me a bit nervous too.

One other thought: even if this is safe for HEAD, I think we could
*not* back-patch it into 9.5, because it would amount to an ABI
break on Windows anywhere that pid_t is used in globally visible
structs or function signatures.  (Maybe there are no such places,
but I doubt it.)  So we'd need to go with the messy-cast solution
for 9.5.
        regards, tom lane