What: Add a MCA-NULL option to open no components in mca_base_open()
Why: Sometimes we do not want to open or select any components of a
Where: patch attached for current trunk.
When: Needs further discussion.
Timeout: Unknown. [May 13, 2008 (After teleconf)?]
This RFC is intended to continue discussion on the thread started here:
Discussion should occur on list, but maybe try to come to some
settlement on this RFC in the next week or two.
Currently there is no way to express to the MCA system that absolutely
no components of a framework are needed and therefore nothing should
be opened. The addition of a sentinel value is needed to explicitly
express this intention. It was suggested that if a 'MCA-NULL' value is
passed as an argument for a framework then this should be taken to
indicate such an intention.