RFR : 8218136: minor hotspot adjustments for xlclang++ from xlc16 on AIX

[Baesken, Matthias]

Hi  David,  I  want to follow your suggestion 😊 .
I adjusted the comment , see  globalDefinitions_xlc.hpp  .

Additionally I removed a  strange ifdef  handling pre-xlc10 versions  that are not useful  today any more for OpenJDK  
( we  most likely cannot build jdk/jdk  with xlc versions < 10).

New webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8218136.2/


Best regards, Matthias



> -----Original Message-----
> From: David Holmes <david.holmes at oracle.com>
> Sent: Freitag, 1. Februar 2019 13:49
> To: Baesken, Matthias <matthias.baesken at sap.com>; 'hotspot-
> dev at openjdk.java.net' <hotspot-dev at openjdk.java.net>;
> 'magnus.ihse.bursie at oracle.com' <magnus.ihse.bursie at oracle.com>
> Cc: 'build-dev at openjdk.java.net' <build-dev at openjdk.java.net>
> Subject: Re: RFR : 8218136: minor hotspot adjustments for xlclang++ from
> xlc16 on AIX
> 
> Hi Matthias,
> 
> On 1/02/2019 10:36 pm, Baesken, Matthias wrote:
> > New webrev :
> >
> > http://cr.openjdk.java.net/~mbaesken/webrevs/8218136.1/
> >
> > - adjusted  globalDefinitions_xlc.hpp
> 
> I don't think it makes sense to keep the comment which was obviously
> copied from the gcc file:
> 
>   // On Linux NULL is defined as a special type '__null'. Assigning
> __null to
>    // integer variable will cause gcc warning. Use NULL_WORD in places
> where a
>    // pointer is stored as integer value.  On some platforms,
> sizeof(intptr_t) >
>    // sizeof(void*), so here we want something which is integer type,
> but has the
>    // same size as a pointer.
> 
> Rather something like:
> 
> // Some platform/tool-chain combinations can't assign NULL to an integer
> // type so we define NULL_WORD to use in those contexts. For xlc they
> // are the same.
> 
> Thanks,
> David
> 
>