Experimental Physics and
Industrial Control System

Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov> · Tue, 11 Feb 2020 18:21:05 +0100

Hey Andrew,

thanks for the answer. I thought about this idea, but in the developers

guide (base 3.15) only PROC_IOC_<osclass> was mentioned.

Good to know one can also define this for single target archs.

Florian

Am 11.02.2020 um 18:16 schrieb Johnson, Andrew N.:

Hi Florian,

Thanks for the clarification. The way to handle this is to adjust the Makefile that compiles the IOC so it *only* tries to build and link the IOC program for the linux-arm target, not for the Linux host. There is a slight trick to doing this, but it’s usually a simple one-line addition.

Where the Makefile says something like

   PROD_IOC = <iocname>

replace it with this:

   PROD_IOC_linux-arm = <iocname>
   PROD_IOC += $(PROD_IOC_$(T_A))

When building any architecture other than linux-arm the second line will evaluate to nothing, so nothing will be built.

HTH,

- Andrew

On Feb 11, 2020, at 10:52 AM, Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov> wrote:

Hey Michael,

as far as I understood, they would like to build everything (base, support modules and IOC) just for the target arch.
But the error occurs for the IOC (which contains a custom support module)

The missing library is the libisegHal which is only build for linux-arm as a part of the same yocto image.
The library is needed for iseg's support module.

Cheers,
Florian

Am 11.02.2020 um 16:34 schrieb Michael Davidsaver:

Can you clarify a couple of points?

Are you referring to building EPICS Base itself, or a support module / IOC application?

Which libraries are missing?  (this might answer the previous question)

On 2/11/20 5:27 AM, Florian Feldbauer via Tech-talk wrote:

Hey all,

I was contacted by iseg with the following problem:

They want to include EPICS in their yocto image for the crate controllers.
The host system is a linux-x86_64 system, the target arch linux-arm.

Currently their Yocto recipe fails, because EPICS is build for both host and target arch and some libraries are missing for the host.

Is there a way to build EPICS only for a target architecture?

Best regards,
Florian

--
Dr. Florian Feldbauer

Ruhr-Universität Bochum
Experimentalphysik I AG
Universitätsstr. 150
Fach-Nr. 125
D-44801 Bochum

Office: NB 2/134
Phone:  (+49)234 / 32-23563
Fax:    (+49)234 / 32-14170
https://paluma.ruhr-uni-bochum.de

--
Dr. Florian Feldbauer

Ruhr-Universität Bochum
Experimentalphysik I AG
Universitätsstr. 150
Fach-Nr. 125
D-44801 Bochum

Office: NB 2/134
Phone:  (+49)234 / 32-23563
Fax:    (+49)234 / 32-14170
https://paluma.ruhr-uni-bochum.de

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System