RE: Building 32-bit EPICS binaries on 64-bit Linux systems

["Mark Rivers" <rivers@cars.uchicago.edu>]

Thanks Stephanie and Janet,

That worked, and it fixed our problems with the IOC.

Where do things stand in EPICS in terms of running IOCs in 64-bit mode?
It turns out I have been actually doing this without knowing it, because
I was building for linux-x86 on a 64-bit system, thinking it was
producing 32-bit binaries, when they were in fact 64-bit.  Some IOCs
seem to work OK, specifically beamline ID5 at the Australian
Synchrotron.

However, a 64-bit IOC to control the Pilatus detector is failing.  It
seems to be crashing in SNL code.  What parts of EPICS (base 4.14.9,
asyn, SNL etc) are believed to be 64-bit safe and which are not?

Thanks,
Mark


-----Original Message-----
From: Allison, Stephanie [mailto:saa@slac.stanford.edu] 
Sent: Thursday, July 17, 2008 4:56 PM
To: Mark Rivers; jba@aps.anl.gov; EPICS tech-talk
Subject: RE: Building 32-bit EPICS binaries on 64-bit Linux systems

Hi Mark,

Till Straumann but these options in our 3.14.8
base/configure/os/CONFIG_SITE.linux-x86.Common:

# T.S, 2006/09/05
# add -m32 so we create 32-bit code when
# executing on 64-bit machine with EPICS_HOST_ARCH=linux-x86
ARCH_DEP_CFLAGS+=-m32
ARCH_DEP_CXXFLAGS+=-m32
ARCH_DEP_LDFLAGS+=-m32

Stephanie

> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov 
> [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Mark Rivers
> Sent: Thursday, July 17, 2008 2:46 PM
> To: jba@aps.anl.gov; EPICS tech-talk
> Subject: Building 32-bit EPICS binaries on 64-bit Linux systems
> 
> Folks,
> 
>  
> 
> I want to build EPICS in 32-bit mode on a 64-bit Linux 
> machine.  I had assumed that all I needed to do was to define 
> EPICS_HOST_ARCH to be linux-x86, rather than linux-x86_64.  
> But when I do this it creates the expected directories and 
> binaries, e.g. bin/linux-x86/caRepeater, etc. but the 
> binaries appear to be 64-bit.  Running "file" on them reports 
> them at ELF 64-bit files.  My IOC is crashing, and I suspect 
> it is because it is built as a 64-bit application.   How do I 
> force it to be built as a 32-bit application?  This is EPICS R3.14.9.
> 
>  
> 
> Thanks,
> 
> Mark
> 
>  
> 
>