Hi Steve,

from my experience the  situation is similar to Linux  (small  performance change).

Best regards, Matthias

From: Steve Groeger <GROEGES@uk.ibm.com>
Sent: Mittwoch, 16. Januar 2019 10:49
To: Baesken, Matthias <matthias.baesken@sap.com>
Cc: 'build-dev@openjdk.java.net' <build-dev@openjdk.java.net>; ppc-aix-port-dev@openjdk.java.net; ppc-aix-port-dev <ppc-aix-port-dev-bounces@openjdk.java.net>
Subject: Re: RFR [XS] 8217233: Update build settings for AIX/xlc

Hi Matthias,

The change looks OK.

The docs state: "This option is disabled by default because it can cause performance degradation."
Do you know whether using this option actually causes any performance degradation on AIX?

Thanks
Steve Groeger
IBM Runtime Technologies
Hursley, Winchester
Tel: (44) 1962 816911  Mobex: 279990  Mobile: 07718 517 129
Fax (44) 1962 816800
Lotus Notes: Steve Groeger/UK/IBM
Internet: groeges@uk.ibm.com

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU



From:        "Baesken, Matthias" <matthias.baesken@sap.com>
To:        "'build-dev@openjdk.java.net'" <build-dev@openjdk.java.net>, "ppc-aix-port-dev@openjdk.java.net" <ppc-aix-port-dev@openjdk.java.net>
Date:        16/01/2019 09:26
Subject:        RFR [XS] 8217233: Update build settings for AIX/xlc
Sent by:        "ppc-aix-port-dev" <ppc-aix-port-dev-bounces@openjdk.java.net>

---

Hello,  please review this small fix .

It adds  stack protection compile flags for xlc/AIX .

See :

https://www.ibm.com/support/knowledgecenter/SSGH2K_12.1.0/com.ibm.xlc121.aix.doc/compiler_ref/opt_stackprotect.html


"Provides protection against malicious code or programming errors that overwrite or corrupt the stack."
The patch will set the stack protection flags .


(  Similar changes have been done for Linux :   8199552: Update to build scripts
https://hg.openjdk.java.net/jdk-updates/jdk11u/rev/8b060cdf0251
Introduced stack protection compile flags for Linux/gcc ( -fstack-protector ) .   )


Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8217233

http://cr.openjdk.java.net/~mbaesken/webrevs/8217233.0/


Thanks, Matthias


Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU