Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 27 Jan 2003 17:10:14 -0600

Kevin M. Peterson wrote:
I am trying to run the ioc example from the R3.14.1 AppDevGuide
on a Redhat 8.0 machine.

...
and I get the following error message:
..../../bin/linux-x86/example: error while loading shared libraries: \
    libiocsh.so: cannot open shared object file: \
    No such file or directory
I have verified that EPICS_HOST_ARCH has been set correctly.
I have also built base and the example app with and without
$(INSTALL_LOCATION)/lib/$(EPICS_HOST_ARCH) added to
my LD_LIBRARY_PATH env. variable.
I have a feeling there is something small that I am overlooking.

If you run 'ldd ../../bin/linux-x86/example' you'll see that it is unable
to find the shared libraries from base, which is where libiocsh.so is
found. This is an issue that R3.14.1 doesn't really deal with properly -
we need to add some additional functionality to one of the perl scripts to
fix it, but there are several ways of doing so manually.
I suspect you haven't actually set the LD_LIBRARY_PATH environment
variable properly - what is its exact value? It should be a colon (:)
separated list of absolute path-names to the directories containing the
shared libraries. However there is another way to resolve this problem
which was added to R3.14.1 at a fairly late stage - edit
<base>/configure/os/CONFIG_SITE.Common.linux-x86 and there uncomment and
set the SHRLIB_SEARCH_DIRS path to the absolute path to <base>, then
rebuild your example application (gnumake rebuild from the top level).
You can add other paths to SHRLIB_SEARCH_DIRS in your application too -
you'll need to edit <top>/configure/CONFIG and add the line

SHRLIB_SEARCH_DIRS += $(SNCSEQ)

to make the sequencer example build and run properly (as well as setting
SNCSEQ in your <top>/configure/RELEASE file).
HTH,
- Andrew
--
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System