RFR (XXS): 8067865 : Changes 8066780/8066782 broke the non-PCH build

Volker Simonis volker.simonis at gmail.com
Sat Dec 20 08:03:37 UTC 2014

Hi Vladimir,

would be nice if you could push it to that hs repository which gets synced
next with jdk9/dev.
And it must already have the changes 8066780/8066782.

Other than that I don't have any preferences.

Thanks again,

On Friday, December 19, 2014, Vladimir Kozlov <vladimir.kozlov at oracle.com>

> Looks fine. Where do you want it to be pushed?
> Thanks,
> Vladimir
> On 12/19/14 9:44 AM, Volker Simonis wrote:
>> Hi,
>> could somebody please have a quick look at this fix and sponsor it?
>> It breaks our AIX build.
>> Thank you and best regards,
>> Volker
>> On Thu, Dec 18, 2014 at 5:31 PM, Volker Simonis
>> <volker.simonis at gmail.com> wrote:
>>> Hi,
>>> could sombody please review and sponsor this little change which fixes
>>> the build on AIX after 8066780/8066782:
>>> http://cr.openjdk.java.net/~simonis/webrevs/8067865
>>> https://bugs.openjdk.java.net/browse/JDK-8067865
>>> Here's the full story: 8066780/8066782 did some code refactoring and
>>> introduced the new files cardGeneration.{hpp,cpp,inline.hpp}.
>>> Unfortunately, the changes forgot to include cardGeneration.inline.hpp
>>> into tenuredGeneration.cpp and concurrentMarkSweepGeneration.cpp which
>>> use the methods defined therein.
>>> This problem doesn't show up on Linux (even if build with
>>> '--disable-precompiled-headers') because for some reason GCC places
>>> weak references of the corresponding symbols in cardGeneration.o. So
>>> later when linking libjvm.so the references can still be resolved. Sun
>>> Studio also places global instantiations of the corresponding inline
>>> functions into cardGeneration.o so we don't see any problems there as
>>> well.
>>> xlC on AIX only puts a locally visible reference of the neede inline
>>> functions into cardGeneration.o if he can't inline them (which is
>>> perfectly legal because they are declared 'inline'). However, later
>>> one during linking no globally visible versions of the corresponding
>>> inline functions can be found and the link fails.
>>> The final fix is trivial - just include the corresponding
>>> cardGeneration.inline.hpp file into the .cpp files which require its
>>> method definitions.
>>> Thank you and best regards,
>>> Volker

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