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HDF5:external_filters:LZ4 test fails on SPARC due to unaligned access (Bus error) #28

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@glaubitz

The testsuite of HDF5-External-Filter-Plugins fails on Linux SPARC with:

3: Test command: /<<PKGBUILDDIR>>/obj-sparc64-linux-gnu/BZIP2/test/read_ui8_test
3: Working Directory: /<<PKGBUILDDIR>>/obj-sparc64-linux-gnu/BZIP2/test
3: Environment variables: 
3:  HDF5_PLUGIN_PATH=/<<PKGBUILDDIR>>/obj-sparc64-linux-gnu/plugins
3: Test timeout computed to be: 1500
1/3 Test #1: HDF5:external_filters:LZ4 ..............Bus error***Exception:   0.04 sec

This indicates that the code contains unaligned access which can degrade performance on various non-x86 targets.

Full log in: https://buildd.debian.org/status/fetch.php?pkg=hdf5-filter-plugin&arch=sparc64&ver=0.0%7Egit20221111.49e3b65-4&stamp=1708142362&raw=0

Access to SPARC machines can be obtained through the GCC Compile Farm: https://gcc.gnu.org/wiki/CompileFarm

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