Andrew Stitcher created PROTON-2087:
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             Summary: [Python] Detection of tox caches failure instaead of 
trying again if not initially found
                 Key: PROTON-2087
                 URL: https://issues.apache.org/jira/browse/PROTON-2087
             Project: Qpid Proton
          Issue Type: Bug
          Components: build, python-binding
            Reporter: Andrew Stitcher
            Assignee: Andrew Stitcher


The usual behaviour of CMake find_xxx is to cache when the xxx is found but to 
retry if on rerunning CMake if the xxx wasn't found previously.

The check_python_module() macro didn't do this.

Additionally it only checked that PYTHON_EXECUTABLE was defined and not that it 
has a useful value too. So it would have attempted to use python even if we'd 
looked for it and had not found it.



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