Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 7 Aug 2008 10:01:06 -0500

David Dudley wrote:
> Is there a way to setup the build system so that the
> O.<$EPICS_HOST_ARCH> directories are in another location?

Pete Jemian replied:
> soft links for the O.<$EPICS_HOST_ARCH> directories

I don't think that would work, because we cd into the O.<arch> directories and 
then use ../ relative paths to get to the source files in other locations.  
If O.<arch> is a soft link to elsewhere, inside that directory the parent is 
also on that elsewhere filesystem.

You might be able to use some kind of overlay filesystem to provide the local 
writable directories; Linux has this capability, and I believe Solaris does 
too but I don't know how to set one up.

> >> I'm building for 3 different architectures, and I'd like to put the
> >> EPICS source on a single (hopefully!) write protected NFS server, and
> >> link to it when I need access to build, but would rather not have the
> >> client machine writing directories on the server if I can get away with
> >> it.

Unfortunately we didn't design the EPICS build system for that particular 
model; the model we *did* design for is the one where your install 
directories are elsewhere, but in our model the build hosts have to be able 
to write to the source filesystem.  If you don't want to allow writes to the 
NFS filesystem it might be simpler to have three separate copies of the 
source code (which you could copy or rsync off the NFS server).

- Andrew
-- 
Talk is cheap. Show me the code. -- Linus Torvalds

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System