[omniORB] [External] Re: Exception not caught - omniORB-4.2.0

Tue Aug 4 04:14:46 UTC 2020

Hi Duncan,

Sorry for bothering you.

As you are aware, we have been facing issue on using omniORB-4.2.0 library in gcc-8 due to that exception is not caught properly after we upgraded from gcc-4.8 to gcc-8.2.
Then we found the reason for the issue is gcc when using it on AIX. So, we raised this issue to gcc (please see the below mail) but we didn’t get any valid fix till now.

Meanwhile, we understand that the new released omniORB-4.2.4 version has fixes which is related to exception specifier to support latest C++17.
So, we believed the latest version might have been tested with gcc-8.2 on AIX and we tried to check whether the exception handling issue (when we use with gcc-8.2 on AIX) is fixed within omniORB in the latest version.
We compiled and checked the call_back examples and facing the same termination issue on throwing COMM_FAILURE exception.

Could you please let us know whether the latest omniORB-4.2.4 provides support to gcc-8.2 on AIX? If not, what is the maximum supported and tested gcc version on AIX?
Or do you have any plan for supporting that latest gcc version on AIX?

We are eagerly waiting for your response. Kindly suggest us to move forward in this issue.

Thanks & Regards,
P. Prasath.
_____________________________________________
From: Prasath Palaniappan
Sent: Thursday, December 12, 2019 2:56 PM
To: Duncan Grisby <duncan at grisby.org>; omniorb-list at omniorb-support.com
Cc: Shankar Chinnusamy <Shankar_Chinnusamy at amat.com>
Subject: RE: [External] Re: [omniORB] Exception not caught - omniORB-4.2.0

Hi Duncan,

We posted this query to gcc and got the response i.e. this is a bug in gcc on AIX. Please find the below link,
https://www.spinics.net/lists/gcchelp/msg49970.html

Thank you so much for your prompt support.

Thanks & Regards,
P. Prasath.
_____________________________________________
From: Prasath Palaniappan
Sent: Wednesday, December 11, 2019 7:32 PM
To: 'Duncan Grisby' <duncan at grisby.org<mailto:duncan at grisby.org>>; omniorb-list at omniorb-support.com<mailto:omniorb-list at omniorb-support.com>
Cc: Shankar Chinnusamy <Shankar_Chinnusamy at amat.com<mailto:Shankar_Chinnusamy at amat.com>>
Subject: RE: [External] Re: [omniORB] Exception not caught - omniORB-4.2.0

Hi Duncan,

As you suggested, I am looking into it on compiler and C++ runtime.
I recompiled the gcc-8.2.0 with "--enable-threads" option in order to fix the issue as mentioned in gcc page https://gcc.gnu.org/install/configure.html

I compiled omniORB and examples with this newly built gcc and tested the call_back example and ran into the same issue.
Gone through the traces and observed that omniDynamic library is not linked but this library does get linked and get initialized when we run the omniORB which is compiled with gcc-4.8.3.
omniORB with gcc-4.8.3:
omniORB: Initialising omniDynamic library.
omniORB with gcc-8.2.0:
omniORB: (0) 2019-12-11 01:33:35.484672: Information: the omniDynamic library is not linked.

I agree this is an information, but curious to know whether it impacts anything since it is named as dynamic library.
I looked into forum and found the same post in below link,
https://omniorb-list.realvnc.narkive.com/3WcwVC6I/omniorb-information-the-omnidynamic-library-is-not-linked
and tried your solution by setting "export ORBendPointPublish=ipv4".
It gets reflected in configuration as below but still the omniDynamic is not linked.
omniORB:   endPointPublish = ipv6
And also another query in below link which seems the same, but not answered yet.
https://www.omniorb-support.com/pipermail/omniorb-list/2010-February/030534.html

I am not blaming omni code. I am looking forward to you throwing some light to proceed further in this issue.

Thanks & Regards,
P. Prasath.

-----Original Message-----
From: Duncan Grisby <duncan at grisby.org<mailto:duncan at grisby.org>>
Sent: Wednesday, November 6, 2019 9:53 PM
To: Prasath Palaniappan <Prasath_Palaniappan at amat.com<mailto:Prasath_Palaniappan at amat.com>>; omniorb-list at omniorb-support.com<mailto:omniorb-list at omniorb-support.com>
Cc: Shankar Chinnusamy <Shankar_Chinnusamy at amat.com<mailto:Shankar_Chinnusamy at amat.com>>
Subject: [External] Re: [omniORB] Exception not caught - omniORB-4.2.0

CAUTION: EXTERNAL EMAIL. Verify before you click links or open attachments. Questions? Contact GIS.

On Tue, 2019-11-05 at 18:06 +0000, Prasath via omniORB-list wrote:

[...]
> But when we run the omniORB + application which is compiled with gcc-
> 8.2.0, omniORB gets crashed because it unable to catch the Exception
> “CommFailure” and lead into termination.

This is exactly the same thing you reported back in April:

https://www.omniorb-support.com/pipermail/omniorb-list/2019-April/032050.html

The answer now is the same as the answer then. omniORB's code is correct. It has code that catches the exception. For some reason in your system it is not being caught, but that is not omniORB's fault.

[...]
> But the exception does not get caught with the catch when compiled
> omniORB with gcc-8.2.0.
> Could you please clarify us the cause for this issue and why ominORB
> unable to handle the exception if gcc-8.2.0 and also provide your
> suggestions to fix this issue?

Why do you insist on thinking that omniORB is to blame here?  As you say yourself, the same code works totally fine when you use gcc 4.8.3.
The one thing you have changed is the compiler version. THAT is the culprit, not omniORB. My suggestion to fix the issue is to find a compiler that works.

Duncan.

--
 -- Duncan Grisby         --
  -- duncan at grisby.org<mailto:duncan at grisby.org>     --
   -- http://www.grisby.org --

The content of this message is APPLIED MATERIALS CONFIDENTIAL. If you are not the intended recipient, please notify me, delete this email and do not use or distribute this email.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.omniorb-support.com/pipermail/omniorb-list/attachments/20200804/d72e3dee/attachment-0001.html>