RFR (tedious) 8216022: Use #pragma once

[Erik Österlund]

Hi Matthias,

The #pragma once support was added in Oracle Studio 12u5, which is what 
I have been patiently been waiting for. Having said that, I would 
recommend using 12u6.

Thanks for confirming that xlc 12.1 / AIX works.

/Erik

On 2019-01-04 08:57, Baesken, Matthias wrote:
> Hello   Coleen,   on Solaris  Sparc   with  Oracle Studio  12u4  Oct2017  version   we get
>
> " line 25: Error: Unrecognized #pragma once"
>
> Which  Oracle Studio version do you recommend to use  ?
>
>
> (good news is  that xlc 12.1  / AIX  works )
>
>
> Best regards, Matthias
>
>
>> Message: 2
>> Date: Wed, 2 Jan 2019 21:16:59 -0500
>> From: coleen.phillimore at oracle.com
>> To: hotspot-dev developers <hotspot-dev at openjdk.java.net>, John Paul
>> 	Adrian Glaubitz <glaubitz at physik.fu-berlin.de>
>> Subject: RFR (tedious) 8216022: Use #pragma once
>> Message-ID: <9250036e-8696-6103-6c3f-513fa11ffebd at oracle.com>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> Summary: change include guards to #pragma once, except in generated
>> header files.
>>
>> Tested with mach5 for linux-x64{-debug}, solaris-sparc, macosx-x64,
>> windows-x64, built aarch64 with cross compiler, and zero.
>>
>> Ran tier1 and 2 tests.
>>
>> The webrev is huge but there are only 3 lines changed in each header
>> file.? So click on the patch.
>>
>> I'll update the copyright headers with a script with the commit. Also,
>> will do this after the shenandoah copyright headers are fixed.
>>
>> Adrian: I included you to check your platforms.
>>
>> Happy New Year!
>> Coleen
>>
>>
>> ------------------------------
> ....
>
>> Here is the webrev and bug link.
>>
>> open webrev at http://cr.openjdk.java.net/~coleenp/8216022.01/webrev
>> bug link https://bugs.openjdk.java.net/browse/JDK-8216022
>>