[Bug 1844537] Re: OMSL doesn't work with constant DOL

[Andrew Johnson via Core-talk <core-talk@aps.anl.gov>]

Please look at the current state of the link code in the 7.0 branch,
there have been *many* changes to this code since the 3.14 and 3.15
releases. Constant links now have several methods in the new Link
Support Entry Table (which supports constant arrays and strings), and
new link types can be added outside the Base tree, but this means
changes to how they work are harder to implement. The only external link
type I'm aware of is the pvalink in pva2pva (so not strictly outside the
Base tree), but there might be others so we have to be very careful
about making changes.

Re Ralph's point, please look at the generated boRecord documentation at
https://jenkins.aps.anl.gov/view/EPICS%20Base/job/epics-
base-3.15/lastSuccessfulBuild/artifact/html/boRecord.html and propose
any wording changes to what's currently written there.

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https://bugs.launchpad.net/bugs/1844537

Title:
  OMSL doesn't work with constant DOL

Status in EPICS Base:
  New

Bug description:
  This was incorrectly documented for the boRecord. I just fixed that in
  the wiki.

  However, I see this as yet another arbitrary limitation.

  To lift that we need a small generalisation to how we treat constant
  links. A constant link just has to remember whether it has been
  processed before. The flag gets set by dbGetLink and the like and it
  gets reset after link initialisation (so we can change the "constant"
  using a CA put to the link field). If dbGetLink finds that the link is
  constant, then it converts the value from the string stored in the
  link, but only if it hasn't been processed before. This also means
  that we can deprecate recGblInitConstantLink because it is now
  subsumed by dbGetLink.

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