RFR : 8202322: AIX: symbol visibility flags not support on xlc 12.1

Bhaktavatsal R Maram bhamaram at in.ibm.com
Thu Apr 26 14:59:14 UTC 2018


Hi Matthias,

At this point, I think we can remove the flag as you found that it is not supported in XLC < 13. And with XLC 13, it require more work to use this flag.

Thanks,
Bhaktavatsal Reddy

  

-----"Baesken, Matthias" <matthias.baesken at sap.com> wrote: -----
To: "Langer, Christoph" <christoph.langer at sap.com>, "'build-dev at openjdk.java.net'" <build-dev at openjdk.java.net>, "ppc-aix-port-dev at openjdk.java.net" <ppc-aix-port-dev at openjdk.java.net>, "core-libs-dev at openjdk.java.net" <core-libs-dev at openjdk.java.net>
From: "Baesken, Matthias" <matthias.baesken at sap.com>
Date: 04/26/2018 08:23PM
Cc: "Simonis, Volker" <volker.simonis at sap.com>, Bhaktavatsal R Maram	<bhamaram at in.ibm.com>
Subject: RE: RFR : 8202322: AIX: symbol visibility flags not support on xlc 12.1

       
 Hello Christoph,   I think  all XLC versions  < 12.1   are unsupported  (and probably not working anyway)  for the OpenJDK  build .
 I am only aware   of  XLC  versions  12.1  and 13.1    which  work / in case of 13.1  “might” work   for OpenJDK compilation .
 And for 12.1  I want to remove the flags  .
  
 ( waiting for the feedback  of   Bhaktavatsal Reddy ,  in case he  prefers it  I remove them for all xlC versions including 13.1 )
  
 Best regards, Matthias
  
  
  
 
 
 
 From: Langer, Christoph 
 Sent: Donnerstag, 26. April 2018 16:38
 To: Baesken, Matthias <matthias.baesken at sap.com>; 'build-dev at openjdk.java.net' <build-dev at openjdk.java.net>; ppc-aix-port-dev at openjdk.java.net; core-libs-dev at openjdk.java.net
 Cc: Simonis, Volker <volker.simonis at sap.com>
 Subject: RE: RFR : 8202322: AIX: symbol visibility flags not support on xlc 12.1
    
 Hi Matthias,
  
 to me the change in principal looks good.
  
 I’m wondering if it is possible to do a comparison like xlc < 13 (e.g. extract major number before the first dot, then compare numerically) – but maybe it is too complicated and the current single version compare suits  our needs ?
  
 Best regards
 Christoph
  
  
 
 
 From: Baesken, Matthias 
 Sent: Donnerstag, 26. April 2018 16:14
 To: 'build-dev at openjdk.java.net' <build-dev at openjdk.java.net>; ppc-aix-port-dev at openjdk.java.net; core-libs-dev at openjdk.java.net
 Cc: Langer, Christoph <christoph.langer at sap.com>; Simonis, Volker <volker.simonis at sap.com>
 Subject: RFR : 8202322: AIX: symbol visibility flags not support on xlc 12.1
    
 Hello  ,  could you please review this small adjustment to  the symbol visibility compilation settings on AIX ?
 Currently  we use  XLC 12.1  to compile  JDK on AIX .
  
 However XLC 12.1   does not support  the “-qvisibility=hidden”  setting currently set on AIX.
 It was introduced with  XLC 13.1 . Christoph found some info about it here :
  
 https://www.ibm.com/developerworks/aix/library/au-aix-symbol-visibility-part2/index.html
  
 Setting it  only generates  hundreds  of warnings  in the build log , warnings look like this :
 XlC12.1
  
 bash-4.4$ xlC -qversion
 IBM XL C/C++ for AIX, V12.1 (5765-J02, 5725-C72)
 Version: 12.01.0000.0019
  
 bash-4.4$ xlC -qvisibility=hidden sizeof.c -o sizeof_aixxlc
 1506-173 (W) Option visibility=hidden is not valid. Enter xlC for list of valid options.
  
 Compare to XLC13.1
  
 bash-3.00$ xlC -qversion
 IBM XL C/C++ for AIX, V13.1 (5725-C72, 5765-J07)
 Version: 13.01.0000.0008
 bash-3.00$ xlC -qvisibility=default sizeof.c -o sizeof_aixxlc
 bash-3.00$ xlC -qvisibility=hidden sizeof.c -o sizeof_aixxlc
  
  
 So it is better to avoid  setting these flags when using xlc12.1   .
 Please review :
  
 Bug :
  
 https://bugs.openjdk.java.net/browse/JDK-8202322
  
 Change :
  
 http://cr.openjdk.java.net/~mbaesken/webrevs/8202322/
  
  
 Best regards, Matthias
  
  
      



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