HDF5 Problem

[Adam Dershowitz]

> On Oct 13, 2016, at 11:32 AM, Ryan Schmidt <ryandesign at macports.org> wrote:
> 
>> 
>> On Oct 13, 2016, at 10:14 AM, Adam Dershowitz <dersh at alum.mit.edu> wrote:
>> 
>> I just updated hdf5 and hdf5-18:
>> 
>> hdf5                           1.10.0_1 < 1.10.0-patch1_0   
>> hdf5-18                        1.8.16_6 < 1.8.17_0       
>> 
>> Now when I try to use pandas to open an HDF5 file I get this error:
>> 
>> Warning! ***HDF5 library version mismatched error***
>> The HDF5 header files used to compile this application do not match
>> the version used by the HDF5 library to which this application is linked.
>> Data corruption or segmentation faults may occur if the application continues.
>> This can happen when an application was compiled by one version of HDF5 but
>> linked with a different version of static or shared HDF5 library.
>> You should recompile the application or check your shared library related
>> settings such as 'LD_LIBRARY_PATH'.
>> You can, at your own risk, disable this warning by setting the environment
>> variable 'HDF5_DISABLE_VERSION_CHECK' to a value of '1'.
>> Setting it to 2 or higher will suppress the warning messages totally.
>> Headers are 1.8.16, library is 1.8.17
> 
> Sounds like whatever library generated that error (you mentioned py27-pandas and py27-tables but I don't know) is being possibly overzealous in its hdf5 version checking. Sounds like we should increase the revision of whichever port is triggering this error, and add a comment to the hdf5 port to remind us to do that every time the version of hdf5 is increased.
> 
> It looks to me like py27-tables is the one that depends on hdf5-18, so that's the one that probably needs to be rebuilt. py27-pandas only depends on py27-tables and other python modules. 
> 
> 
>> I tried uninstalling and reinstalling pandas and py27-tables, but that didn’t help.
> 
> If you received a binary from our server, it would be a binary built with the old version of hdf5. We need to increase that port's revision to cause it to rebuild with the new version of hdf5.
> 
> You can try rebuilding from source on your system to identify the problem. 
> 
> sudo port -ns upgrade --force py27-tables
> 
> If that works, let us know so we can increase its revision.

Yes, forcing the rebuild of py27-tables seems to fix the problem.  
Although, it was slightly more complicated because that rebuild complained that py27-tables can’t be built with hdf5 active, so i had to force deactivate that, then it built fine, and reactivated hdf5 after.  


> 
> 
> Looking a little further, I see that the "HDF5 library version mismatched error" actually comes from the hdf5-18 (and hdf5) source code. This makes me think that *any* port that uses hdf5-18 (or hdf5) will encounter this problem, and they should all be revbumped any time the version of hdf5-18 (or hdf5) is increased. This is a pain and the developers of hdf5 should be contacted to explain this to them, so that they can weigh in on why they are inflicting this pain on us and what they can do to mitigate it in subsequent versions of their software.
> 
> 
>> So, I’m not sure where the bug actually is, what to do about it, or what port to file a bug report against.
>> Any suggestions?  

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