Re: Building EPICS base/IOC only for cross target

[Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov>]

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