RE: synApps quadEM build-time code generation

[Iain Marcuson via Tech-talk <tech-talk at aps.anl.gov>]

Python being heavy is a good point.  The files rarely have to be generated, so it makes sense to generate and commit them.  I will also commit the Python script and template file.

Thank you all for the help.

Iain.

-----Original Message-----
From: J. Lewis Muir <jlmuir at imca-cat.org> 
Sent: Friday, October 11, 2024 3:39 PM
To: Iain Marcuson <iain.marcuson at sydortechnologies.com>
Cc: Johnson, Andrew N. <anj at anl.gov>; tech-talk at aps.anl.gov
Subject: Re: synApps quadEM build-time code generation

On 10/11, Iain Marcuson via Tech-talk wrote:
> My IOC has quite a few parameters that can be described for our purposes as basically (name, register number, type, bitmask, scale and offset parameter) tuples.  I have a Python script I run before compilation that turns those entries into database files and C++ entries.  I then run the standard `make` to build the IOC.  One possibility I see is for the build process to run that Python script and move the output files as a prelude to the compilation.

A downside of that is that it would make Python a build-time dependency of quadEM.  The EPICS build system already has Perl as a dependency.  A Python dependency for quadEM would make it even heavier.  How often do you have to generate?  If only when something changes, it would seem better to me to include your Python script for generating databases and
C++ entries in the source tree so that it can be used by a developer
when something changes that requires a regen, but also commit the generated files so that Python isn't required to build quadEM.

I don't know how complex your Python script is, but another possibility would be to rewrite it in Perl.  Then you wouldn't be adding a build-time dependency that isn't already there.

Lewis


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