RFR : 8202322: AIX: symbol visibility flags not support on xlc 12.1 (original) (raw)

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.

Thanks, 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 :

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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