[Bug 1908305] [NEW] Default DTYP can be changed by DBD file order

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

Public bug reported:

Kay Kasemir reported:

I was always silently expecting that a record from a *.db file that
doesn't specifically list the DTYP would default to "Soft Channel".
Example:

record(ai, "XXX")
{
  field(INP, "SomeOtherRecord")
}
just works because the field DTYP="Soft Channel" is the default.

Now I notice that at least with R7.0.3.1, the default is not "Soft
Channel" but whatever is listed first in the *.dbd file. If that file
looks like this:

device(ai, CONSTANT, devAiSoft, "Soft Channel")
device(ai, INST_IO, devAiXXXX, "MyDeviceSupport")

then the default for an ai record DTYP is indeed "Soft Channel".

But if I put "MyDeviceSupport" on top, that becomes the default, as can
happen when you change the order of XXX_DBD file entries in the
Makefile.

** Affects: epics-base
     Importance: Medium
     Assignee: Andrew Johnson (anj)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1908305

Title:
  Default DTYP can be changed by DBD file order

Status in EPICS Base:
  In Progress

Bug description:
  Kay Kasemir reported:

  I was always silently expecting that a record from a *.db file that
  doesn't specifically list the DTYP would default to "Soft Channel".
  Example:

  record(ai, "XXX")
  {
    field(INP, "SomeOtherRecord")
  }
  just works because the field DTYP="Soft Channel" is the default.

  Now I notice that at least with R7.0.3.1, the default is not "Soft
  Channel" but whatever is listed first in the *.dbd file. If that file
  looks like this:

  device(ai, CONSTANT, devAiSoft, "Soft Channel")
  device(ai, INST_IO, devAiXXXX, "MyDeviceSupport")

  then the default for an ai record DTYP is indeed "Soft Channel".

  But if I put "MyDeviceSupport" on top, that becomes the default, as
  can happen when you change the order of XXX_DBD file entries in the
  Makefile.

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