[gdal-dev] GDAL 1.5.2 RC3 and HDF

[Even Rouault]

Hi

There is already a GDAL ticket for this issue : 
http://trac.osgeo.org/gdal/ticket/2297

I have HDF5 1.6.5 installed, which is the packaged version on my Ubuntu 
distro, and current GDAL code compiles fine with it. Apparently there has 
been an API/ABI change between this version and HDF5 1.8.... I'm not sure how 
we can fix that properly if we want to support various HDF5 versions... By a 
very quick read in the second URL you provide, there's a way of compiling 
HDF5 library in 1.6 emulation.

"When both the HDF5 Library and the application are built and installed with 
no specific compatibility flags, H5Gopen is mapped to the most recent version 
of the function, currently H5Gopen2. If the library and/or application is 
compiled for Release 1.6 emulation, H5Gopen will be mapped to H5Gopen1. 
Function-specific flags are available to override these settings on a 
function-by-function basis when the application is compiled."

I don't think this kind of issue can be easily addressed by a maintenance 
release. It seems more appropriate to make HDF5 1.8 compability be a goal of 
the next major GDAL version (I mean GDAL 1.6.0). For the moment, I would say 
the workaround if either to downgrade to HDF5 1.6.X or to compile HDF5 1.8 in 
HDF5 1.6 compability mode. But I speak on my own behalf, so others can have 
different views on that point of course...

Best regards,

Even

Le Friday 30 May 2008 18:47:38 Andrew Brooks, vous avez écrit :
> On Fri, 30 May 2008 17:43:41 +0100, Andrew Brooks <arb at sat.dundee.ac.uk> 
wrote:
> > Both HDF APIs have changed and GDAL no longer compiles.
>
> For more information on the changes required google found these for me:
> http://trac.nexusformat.org/code/ticket/108
> http://www.hdfgroup.uiuc.edu/HDF5/doc_1.8pre/doc/RM/RM_H5G.html#Group-Open2
>
> Andrew
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