Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 12 Aug 2013 10:11:12 -0500

Hi Pavel,

On 08/12/2013 08:07 AM, Pavel Maslov wrote:

But can you compile a support module (that is using asyn and/or
streamdevice) without including base.dbd in the support module's
Makefile? It doesn't work for me as I had this error message during build:

I suspect Dirk is only dynamically loading device support modules, which

(in 3.14.x versions of Base) don't need to have base.dbd loaded because

their DBD file doesn't refer to other DBD files. In your case though

you're trying to load a record type, and the asynRecord.dbd file can't

be loaded by the makeIncludeDbd.pl script because it refers to various

menu.dbd files which are normally loaded by base.dbd.

In Base 3.15.0.1 even Dirk's approach doesn't work because I have

replaced the makeIncludeDbd.pl script one script that fully parses the

DBD files as it loads and expands them, and that script rejects Dirk's

device() entries because they refer to a record type which the script

has not seen in his case. I hope to find a way around this in the

future, but it will probably involve adding the equivalent of function

prototypes to the DBD file syntax to allow references to externally

defined objects.

In the meantime you should be able to use dynamic loading for device

support, but record types are harder. You might be able to do it by

including the menuGlobal.dbd file in your build instead of base.dbd, and

maybe some other files too. Note that dynamic loading of modules like

this is not documented as being supposed to work, so if you manage to

get something working I can't promise that we won't break it in the future.

- Andrew
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System