hwloc's detect.sh fails if hwloc-info is not installed

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Issue #2334 resolved
Roland Haas created an issue

Git hash c1b1ec0 "hwloc: add workarounds to get hwloc version for pre 2.1 hwloc" of ExternalLibraries-hwloc introduced code into hwloc’s detect.sh that uses hwloc-info to find out the library version. This code causes detect.sh to fail if hwloc-info is not present.

This pull request


adds checks about whether hwloc-info exists before using it.

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