Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Wed, 9 Dec 2015 15:54:24 -0600

On 12/09/2015 03:40 PM, Michael Davidsaver wrote:
> On 12/09/2015 04:27 PM, Cusick, Martin-Lee wrote:
>> So I just need some clarity on where you want the EPICS_HOST_ARCH variable set.
> 
> The simplest thing to do is not to set it at all.  This used to be a
> requirement and the build would fail without it.  With recent Base
> releases this variable will be automatically set by Make each time it
> runs if it is not set in the process environment.

This approach is fine for just building EPICS code, but there may be
other reasons why you might want to set it; in our case the same system
script that sets the variable also sets the user's PATH to include the
/usr/local/epics/extensions/bin/$EPICS_HOST_ARCH directory (plus some
other similar paths) so it needs to determine what the architecture is
at login time anyway. Michael's Debian installations probably put all of
their EPICS executables into /usr/bin or /usr/local/bin anyway so his
users don't normally need the variable set, whereas ours do and we set
it in a script that gets sourced through /etc/profile.d or the equivalent.

I think my main point is There's More Than One Way To Do It (TMTOWTDI)
so you'll have to work out for yourself what makes the most sense in
your circumstance.

- Andrew

-- 
Light thinks it travels faster than anything but it is wrong.
No matter how fast light travels, it finds the darkness has
always got there first, and is waiting for it.
    -- Terry Pratchett, Reaper Man

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System