RFR: Update build documentation to reflect compiler upgrades at Oracle

[Erik Joelsson]

Hello,

We will most likely need to drop support for older VS in JDK 12 as there 
is much interest to move to a later C++ standard in Hotspot. That change 
has not happened yet though and will certainly require a JEP (the C++ 
standard change part). In the meantime, if you need JDK 12 to work on 
VS2013, I think your change makes sense (unless it's a step backwards 
from a standards perspective, hopefully Kim or someone better versed in 
language and standard libs can answer that).

I would recommend upgrading your build environment to VS2017 instead if 
possible. You only need the "BuildTools" distribution to build OpenJDK. 
The community edition also works. Installing it in parallel with VS2013 
works fine. JDK 11/12 builds will automatically pick 2017 and JDK 8/9/10 
will automatically pick 2013.

/Erik


On 2018-07-23 23:06, Michal Vala wrote:
> Aha, this is for 11. It's ok then.
>
> On 07/24/2018 08:02 AM, Michal Vala wrote:
>> Hi,
>>
>> On 07/23/2018 07:13 PM, Erik Joelsson wrote:
>>> The build documentation needs to be updated to reflect the compiler 
>>> updates that took place at Oracle for JDK 11.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8208096
>>>
>>> Webrev: http://cr.openjdk.java.net/~erikj/8208096/webrev.01/
>>>
>>> /Erik
>>>
>>
>> OpenJDK is currently not buildable with Visual Studio <2015 due to 
>> missing `snprintf`[1].
>>
>> We should either update the doc to minimal version 2015, or commit 
>> JDK-8208084 from another RFR[2].
>>
>> [1] - https://bugs.openjdk.java.net/browse/JDK-8208084
>> [2] - 
>> http://mail.openjdk.java.net/pipermail/build-dev/2018-July/022748.html
>