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

Baesken, Matthias matthias.baesken at sap.com
Thu Apr 26 14:52:34 UTC 2018


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<mailto:build-dev at openjdk.java.net>>; ppc-aix-port-dev at openjdk.java.net<mailto:ppc-aix-port-dev at openjdk.java.net>; core-libs-dev at openjdk.java.net<mailto:core-libs-dev at openjdk.java.net>
Cc: Langer, Christoph <christoph.langer at sap.com<mailto:christoph.langer at sap.com>>; Simonis, Volker <volker.simonis at sap.com<mailto: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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