[GSoC 2020]: Doubts in building RSB Recipe for EPICS for multiple architectures

[Mritunjay Sharma]

On Wed, Jul 29, 2020 at 10:02 AM Chris Johns <chrisj at rtems.org> wrote:

> On 29/7/20 4:43 am, Mritunjay Sharma wrote:
> > First of all apologies for a little late response,
> > please find the link to the blogs which tell how to Build EPICS7 with
> > RTEMS5 for pc-386 by hand here:
> >
> > Part 1
> > :
> https://medium.com/@mritunjaysharma394/installing-rtems-ecosystem-and-building-your-first-bsp-993d1cf38902
> >
> > Part
> > 2:
> https://medium.com/@mritunjaysharma394/building-epics7-with-rtems5-by-hand-12d9fbd2eb82
> >
> > Please do have a read and give me your feedback for improvements
> >
>
> It looks good.
>
> I think adding the commands you use after the text "Unzip the downloaded
> Zip
> file inside this directory." helps. If the blob captures the exact
> commands it
> makes it easier for me to follow. The EPICS link is hard to find.
>

Thank you so much for the feedback. I will fix that.

>
> > On Mon, Jul 27, 2020 at 7:20 AM Chris Johns <chrisj at rtems.org
> > <mailto:chrisj at rtems.org>> wrote:
> >
> >     On 27/7/20 10:34 am, Mritunjay Sharma wrote:
> >     >
> >     > Please find the patch for PC for EPICS here
> >     >
> >
> https://github.com/mritunjaysharma394/epics-mritunjay/blob/master/patches/0001-Added-Support-for-RTEMS-pc386.patch
> >
> >     Thanks.
> >
> >     > As an experiment, in the 4 patches I have sent to devel for RSB
> recipe a few
> >     > days pack, I worked on a local file. I will modify it to published
> source soon
> >     > in the next version of patch.
> >
> >     Are the EPICS configure files just Makefiles?
> >
> >
> > I think so and more clarity can be given by Heinz on it.
>
> Lets assume they are for now.
>

Okay.

>
> >     Can the variables altered in your patch be controlled from the
> command line?
> >
> >     What does the `T_A` variables in EPICS mean? I see this is used here
> ...
> >
> > I searched about it in the EPICS documentation and found that T_A
> variable refers
> > to 'T_A) is the current build’s target architecture'.
>
> Target Architecture seems likely. I would assume we need to look into what
> these
> are more.


Yes.


>
>
> I tried to alter it using the command line but I think it didn't work or
> maybe I
> > was doing in the wrong way? Heinz, can you comment on this?
>
> Please post the commands and the output. I find it hard to follow what is
> happening here.
>
> >
> https://github.com/mritunjaysharma394/epics-mritunjay/blob/master/configure/CONFIG#L64
> >
> >     If you look down from this there are some special includes ...
> >
> >
> https://github.com/mritunjaysharma394/epics-mritunjay/blob/master/configure/CONFIG#L113
> >
> >     What are these files for?
> >
> >
> > I found this information about them in the documentation:
> >
> > 'User specific override definitions are allowed in user created files in
> the user’s
> > <home>/configure subdirectory. These override definitions will be used
> for builds
> > in all <top> directory structures. The files must have the following
> names.
> >
> > <home>/configure/CONFIG_USER
> > <home>/configure/CONFIG_USER.<epics_host_arch>
> > <home>/configure/CONFIG_USER.Common.<targetarch>
> > <home>/configure/CONFIG_USER.<epics_host_arch>.<targetarch>'
>
> That is promising but using $HOME makes it hard.
>
> > The link to the documentation is:
> > https://epics.anl.gov/base/R3-15/6-docs/AppDevGuide/BuildFacility.html
>
>
> Thank you for the link. I will take a look.
>
> Chris
>

You are welcome, Chris! Meanwhile, I worked out on testing part a little
bit and will be starting another thread for it.
I am looking forward to your suggestions for the roadmap ahead.

Thanks
Mritunjay
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