#972069 slepc64-dev: enable ARPACK support in 64-bit build

Package:
slepc64-dev
Source:
slepc
Description:
Scalable Library for Eigenvalue Problem Computations (64-bit)
Submitter:
Drew Parsons
Date:
2024-12-11 12:09:01 UTC
Severity:
normal
#972069#5
Date:
2020-10-12 04:22:36 UTC
From:
To:
ARPACK support was disabled in slepc 3.14.0+dfsg1-1 since ARPACK
cannot be used with 64-bit integers. This is because a 64-bit build of
libarpack2-dev is not yet available.

Bug#972068 has been filed to request a 64-bit build of arpack.
Once this is done it will be possible to reinstate ARPACK support in
slepc64.  It may require ILP64 support in other components of the
numerical library stack (e.g. openmpi, see Bug#961108)
#972069#12
Date:
2024-12-11 12:07:44 UTC
From:
To:
I don't think we'll be able to resolve this request.

64-bit arpack is now available in libarpack64-2-dev

But slepc's arpack configuration uses parpack when MPI support is active


64-bit support in ARPACK is explicitly excluded from PARPACK,
see
https://github.com/opencollab/arpack-ng/blob/804fa3149a0f773064198a8e883bd021832157ca/configure.ac#L196

i.e. libparpack64.so is not available
and we therefore cannot activate 64-bit ARPACK for SLEPc.