Experimental Physics and
Industrial Control System

Emmanuel Mayssat <[email protected]> · Tue, 10 Apr 2007 18:27:31 -0700

Long time user of medm, I finally decided to get a closer look at edm.
After solving the compilation issues, I had to configure the edmObjects
and edmPvObjects files.

Now, I have an issues with the entries in edmObjects particularly the
one for the GIF widget.

When I look at the compilation of edm, I see 

/usr/bin/ar -rc   libcf322683-513e-4570-a44b-7cdd7cae0de5.a       gif.o
reg_libcf322683-513e-4570-a44b-7cdd7cae0de5.o 

or again

/usr/bin/g++ -o libcf322683-513e-4570-a44b-7cdd7cae0de5.so -shared -fPIC
-L../../../../lib/linux-x86/  -L/usr/X11R6/lib -L/usr/X11R6/lib
-L../../../../lib/linux-x86 -L/usr/local
-Wl,-rpath,/net/cxsfs/home/bluice/devel/epics-extensions/lib/linux-x86
gif.o reg_libcf322683-513e-4570-a44b-7cdd7cae0de5.o   -lEdmBase
-lcfcaa62e-8199-11d3-a77f-00104b8742df -lXm -lXt -lXp -lXtst -lX11
-lpthread -ldl -lungif  -lpthread   -lreadline -lcurses -lm -lrt -lgcc
Installing shared
library ../../../../lib/linux-x86/libcf322683-513e-4570-a44b-7cdd7cae0de5.so

Which leads me to think that gif support is in this
cf322683-513e-4570-a44b-7cdd7cae0de5 library.
(What a great name ! ;-)

So I update my edmObjects file accordingly with the following entry.

cf322683-513e-4570-a44b-7cdd7cae0de5 /EPICS_EXTENSIONS/lib/linux-x86/libcf322683-513e-4570-a44b-7cdd7cae0de5.so Graphics GIF Image

Then I can start edm (prior it was complaining that the library didn't
exist). But now, when I run edm and try to create a display with a gif,
edm *silently* crashes with the message below.

[bluice@cxs0bl1 template]$ edm
/home/cxsfs/bluice/devel/epics-extensions/lib/linux-x86/libcf322683-513e-4570-a44b-7cdd7cae0de5.so: undefined symbol: create_cf322683-513e-4570-a44b-7cdd7cae0de5Ptr
Segmentation fault

Questions:
1/ Where are those library names coming from ? How are they generated?
2/ Where did I go wrong in the GIF widget configuration ? I did
something very similar for the PNG widgets and it worked immediately
(kudos!).
3/ EDM is very similar to medm. Ok, you can create new widgets, but is
this really worth the transition?
4/ Is someone maintaining a library of edm widgets?
5/ Is there any other display manager worth the try?
6/ Why does (almost) none of the epics software work out of the box?
Keep that one for later, that another $64K question ;-)

Regards,
--
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System