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<== Date ==> <== Thread ==>

Subject: Re: epics debian repository update
From: Benjamin Franksen <benjamin.franksen@bessy.de>
To: tech-talk@aps.anl.gov
Date: Thu, 20 May 2010 21:14:26 +0200
On Donnerstag, 20. Mai 2010, Michael Davidsaver wrote:
> On 05/19/10 15:26, Benjamin Franksen wrote:
> > On Mittwoch, 19. Mai 2010, Davidsaver, Michael wrote:
> >> The difficultly is cross compiling for RTEMS.  I'm not sure if it will
> >> work out in the long term, but I have had positive feedback from the
> >> few people who have used it.
> >
> > It is great mystery to me how you could build an EPICS package at all.
>
> The usual way, lots of trial, and lots of error :)
>
> > What about all the other cross-compiler targets and their specific
> > configuration?
>
> While I've had many frustrations with it, I must say that this is were
> the Base build system helped me.  Mostly this just worked.  

How?

> Of course I 
> only cross-build RTEMS, not other host targets.  There is much less
> chance of shared library dependency problems when you don't have shared
> libraries!

I don't understand. This is from base-3.14.11/configure/CONFIG_SITE:

#  The cross-compiler architectures to build EPICS for
#
#  Currently Supporting:
#       linux-386               (linux-x86 host)
#       linux-486               (linux-x86 host)
#       linux-586               (linux-x86 host)
#       linux-686               (linux-x86 host)
#       linux-arm
#       linux-arm_eb
#       linux-arm_el
#       linux-athlon            (linux-x86 host)
#       linux-cris              (Axis GNU crosscompiler on linux-x86 host)
#       linux-cris_v10          (Axis GNU crosscompiler on linux-x86 host)
#       linux-cris_v32          (Axis GNU crosscompiler on linux-x86 host)
#       linux-xscale_be
#       vxWorks-486
#       vxWorks-68040
#       vxWorks-68040lc
#       vxWorks-68060
#       vxWorks-pentium
#       vxWorks-ppc603
#       vxWorks-ppc603_long
#       vxWorks-ppc604
#       vxWorks-ppc604_long
#       vxWorks-ppc604_altivec
#       vxWorks-mpc8540
#       RTEMS-at91rm9200ek
#       RTEMS-beatnik
#       RTEMS-gen68360
#       RTEMS-mcp750
#       RTEMS-mvme167
#       RTEMS-mvme2100
#       RTEMS-mvme3100
#       RTEMS-mvme5500
#       RTEMS-pc386
#       RTEMS-psim
#       RTEMS-uC5282
#

# Definitions of CROSS_COMPILER_TARGET_ARCHS in
# configure/os/CONFIG_SITE.<host>.Common files will
# override 
#
CROSS_COMPILER_TARGET_ARCHS=

How does the debian package know which of them I (a) have installed, and (b) 
want to build EPICS against?

One solution I could imagine is to have an epics-base package, and then lots 
of dependent packages for each possible cross target, like e.g. 
epics-base-vxworks-pentium, etc. Of course these would have to depend on 
properly packaged (or at least, installed) target cross compilers.

Cheers
Ben

References:
epics debian repository update Davidsaver, Michael
Re: epics debian repository update Benjamin Franksen
Re: epics debian repository update Michael Davidsaver

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