RFR: 8166189: Fix for Bug 8165524 breaks AIX build

[Volker Simonis]

Hi Christoph,

I think your change is fine as a quick-fix to fix the build. But
you're completely right that this should be reworked in the long term.
I hate to see that we now have the third version of these routines in
the OpenJDK. Unfortunately a clean solution is not trivial.

libjli is not linked against libjvm because libjli is actually used to
load libjvm. So we can not put the dladdr routines for AIX there. But
I think we should at least consolidate the two versions which will be
in the class library after your change. Initially I intentionally put
porting_aix.{c,h} into jdk/aix/porting with the intent to make it
available to ALL jdk native libraries.

Unfortunately, with the source code reorganization due to the modular
changes, the common, top-level aix repository had to go away and the
code was moved to src/java.desktop/aix/native/libawt/porting_aix.c.
With the reorganized, modularized source code layout and build system
it is not possible to share code between modules. We somehow have to
fix this although I currently don't know how. IF somebody has an idea,
please let me know :)

Regarding your change:

- can you please move

+#if defined(_AIX)
+#include "java_md_aix.h"
+#endif
+

from java_md_common.c to the end of
java.base/unix/native/libjli/java_md.h. It will then be automatically
included into java_md_common.c trough java.h which includes java_md.h

Also, this version of dladdr is inherently not thread safe. I don't
think that's a problem here, but it would be nice if you could quickly
check if that's indeed true.

Besides that, looks good.

Thanks for fixing,
Volker




On Fri, Sep 16, 2016 at 11:58 AM, Langer, Christoph
<christoph.langer at sap.com> wrote:
> Hi,
>
> the fix for https://bugs.openjdk.java.net/browse/JDK-8165524 breaks the AIX build as function dladdr is not available on AIX.
>
> There already exist ports of that API in hotspot and awt. With the proposed change I duplicate the awt port to libjli. This is maybe only a quick fix - eventually we should think about consolidating and using the hotspot port in all places by exporting it from libjvm.so for AIX.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8166189
> Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8166189.0/
>
> Thanks
> Christoph
>
>
>> -----Original Message-----
>> From: core-libs-dev [mailto:core-libs-dev-bounces at openjdk.java.net] On Behalf
>> Of Kumar Srinivasan
>> Sent: Montag, 12. September 2016 22:57
>> To: core-libs-dev <core-libs-dev at openjdk.java.net>; Mandy Chung
>> <mandy.chung at oracle.com>; Chris Bensen <chris.bensen at oracle.com>
>> Subject: RFR: 8165524: Better detect JRE that Linux JLI will be using
>>
>> Hello,
>>
>> I am sponsoring this changeset for Chris Bensen of the java packager
>> team, please review  fix for the launcher to  better locate java.home.
>>
>> http://cr.openjdk.java.net/~ksrini/8165524/
>>
>> Thanks
>> Kumar
>