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

Bhaktavatsal R Maram bhamaram at in.ibm.com
Thu Apr 26 14:32:04 UTC 2018

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.

Bhaktavatsal Reddy


-----"core-libs-dev" <core-libs-dev-bounces at openjdk.java.net> wrote: -----
To: "'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" 
Sent by: "core-libs-dev" 
Date: 04/26/2018 07:45PM
Cc: "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 :


Setting it  only generates  hundreds  of warnings  in the build log , warnings look like this :

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 :


Change :


Best regards, Matthias

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