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Fix HDF5 configuration in lal/configure.ac

Karl Wette requested to merge ANU-CGA/lalsuite:fix-hdf5-config into master

Description

AX_LIB_HDF5() does not save -rpath flag needed to link against non-system locations, so need to reproduce it from -L flag.

I encountered this problem because I have HDF5 installed through the system and also through Conda. LAL was picking up the Conda install through AX_LIB_HDF5(), but it was not properly linking liblalsupport.so to the Conda install by using -rpath, so it would default to the system install, then complain at runtime because the system and Conda installs are of different versions.

API Changes and Justification

Backwards Compatible Changes

  • This change introduces no API changes
  • This change adds new API calls

Backwards Incompatible Changes

  • This change modifies an existing API
  • This change removes an existing API

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

@duncanmmacleod @adam-mercer to review

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