Hi Matthias,

Its right in time. I am facing "Undefined Symbol" errors with XLC 13.1 due to 
"-qvisibility=hidden" which hides all symbols by default. I workaround that by 
removing this flag

-bash-4.4$ xlC -qversion
IBM XL C/C++ for AIX, V13.1.3 (5725-C72, 5765-J07)
Version: 13.01.0003.0000

Looks like there are many function declarations that require changes to make 
function visible.

Thanks,
Bhaktavatsal Reddy

  

-----"core-libs-dev" <core-libs-dev-boun...@openjdk.java.net> wrote: -----
To: "'build-...@openjdk.java.net'" <build-...@openjdk.java.net>, 
"ppc-aix-port-...@openjdk.java.net" <ppc-aix-port-...@openjdk.java.net>, 
"core-libs-dev@openjdk.java.net" <core-libs-dev@openjdk.java.net>
From: "Baesken, Matthias" 
Sent by: "core-libs-dev" 
Date: 04/26/2018 07:45PM
Cc: "Simonis, Volker" <volker.simo...@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://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.openjdk.java.net_browse_JDK-2D8202322&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=KUVGEwJiRVpNtQ9wUhGP6BKqzSTV1OWX31WWPdQMmqg&m=F6_aATE7bsRWZG5lPZhJUESHNGqST5MNbkULllIH8l4&s=M4IJ-YdB3dfN7lj0DEWozQbipDXmgKtSu3pEyMcJF_E&e=

Change :

https://urldefense.proofpoint.com/v2/url?u=http-3A__cr.openjdk.java.net_-7Embaesken_webrevs_8202322_&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=KUVGEwJiRVpNtQ9wUhGP6BKqzSTV1OWX31WWPdQMmqg&m=F6_aATE7bsRWZG5lPZhJUESHNGqST5MNbkULllIH8l4&s=gb0OP9fQTAWWJbBZDK6L_0gTKf1pwna8aXaYr_uVv8Q&e=


Best regards, Matthias



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