Update HDF5 detection #4708
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Update HDF5 detection #4708
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Test this please |
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It would be helpful to add a comment in the cmake file, for future readers wondering why the version is checked manually vs. using the built-in version check on find_package. |
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Added, good point Mark. Hopefully we won't have to revisit this, since the question of whether different versions of HDF5 are compatible with each other does not have a simple answer. |
markdewing
approved these changes
Aug 24, 2023
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Test this please |
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I think this also fixes #4447 |
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@quantumsteve Note that when I checked 1.14.x it was for a serial build. Can you verify the MPI case? |
Just built with MPI and 1.14.2. CMake configuration was successful and All deterministic tests pass. |
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Thanks Steve |
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Proposed changes
Fix reported HDF5 detection problems. Closes #4705 .
Remove the version check from the find_package line, and enforce minimum version ourselves afterwards. HDF5 detection without the "minimum compatible version" of 1.10.0 is how we checked in QMCPACK v3.15.0, which is reported to still work reliably.
The fix solves the problem of HDF5 sometimes not being found because depending on how HDF5 was installed and is found (module vs config mode in find_package), the version check and compatibility analysis done by CMake work differently. This is described in the CMake docs but is subtle. Simplest solution is the one here; we only need to protect against 1.8.x, and even then this is old enough that I doubt it is very relevant today. 1.10.x, 1.12.x, 1.14.1 all appear to work with QMCPACK in my testing. I also verified that the FreeBSD 13.2 system HDF5 package now works.
What type(s) of changes does this code introduce?
Does this introduce a breaking change?
What systems has this change been tested on?
FreeBSD13.2, RHEL9, WSL2/Ubuntu with varous autotools, spack and cmake installs.
Checklist