RFR: 8199736: Define WIN32_LEAN_AND_MEAN before including windows.h

[David Holmes]

Hi Robin,

On 23/03/2018 10:37 PM, Robin Westberg wrote:
> Hi Kim & Erik,
> 
> Certainly makes sense to define it from the build system, I’ve updated the patch accordingly:
> 
> Full: http://cr.openjdk.java.net/~rwestberg/8199736/webrev.01/ <http://cr.openjdk.java.net/~rwestberg/8199736/webrev.01/>
> Incremental: http://cr.openjdk.java.net/~rwestberg/8199736/webrev.00-01/ <http://cr.openjdk.java.net/~rwestberg/8199736/webrev.00-01/>

I'm a little unclear on the hotspot changes. If we define 
WIN32_LEAN_AND_MEAN then certain APIs like sockets are excluded from 
windows.h so we then have to include the specific header files like 
winsock2.h - is that right?

src/hotspot/share/interpreter/bytecodes.cpp

I'm curious about this change. u_short comes from types.h on 
non-Windows, is it simply missing on Windows (at least once we have 
WIN32_LEAN_AND_MEAN defined) ?

src/hotspot/share/utilities/ostream.cpp

1029 #endif
1030 #if defined(_WINDOWS)

Using elif could be marginally faster given the two sets of conditions 
are mutually exclusive.

Thanks,
David

> (Not quite sure if the definition belongs where I put it or a bit later where most other windows-specific JVM flags are defined, but seemed reasonable to put it close to where it is defined for the JDK libraries).
> 
> Best regards,
> Robin
> 
>> On 22 Mar 2018, at 16:52, Kim Barrett <kim.barrett at oracle.com> wrote:
>>
>>> On Mar 22, 2018, at 10:34 AM, Robin Westberg <robin.westberg at oracle.com> wrote:
>>>
>>> Hi all,
>>>
>>> Please review the following change that defines WIN32_LEAN_AND_MEAN [1] before including windows.h. This marginally improves build times, and makes it possible to include winsock2.h.
>>>
>>> Issue: https://bugs.openjdk.java.net/browse/JDK-8199736 <https://bugs.openjdk.java.net/browse/JDK-8199736>
>>> Webrev: http://cr.openjdk.java.net/~rwestberg/8199736/webrev.00/ <http://cr.openjdk.java.net/~rwestberg/8199736/webrev.00/>
>>> Testing: hs-tier1
>>>
>>> Best regards,
>>> Robin
>>>
>>> [1] https://msdn.microsoft.com/en-us/library/windows/desktop/aa383745%28v=vs.85%29.aspx#faster_builds_with_smaller_header_files <https://msdn.microsoft.com/en-us/library/windows/desktop/aa383745(v=vs.85).aspx#faster_builds_with_smaller_header_files>
>>
>> I think the addition of the WIN32_LEAN_AND_MEAN definition should be done through the build
>> system, so that it applies everywhere.
>>
>