Experimental Physics and
Industrial Control System

Rod Nussbaumer <[email protected]> · Sun, 31 Oct 2010 13:15:40 -0700

Greeting, all.
All of the recent talk about readline support for the IOC shell has
pointed out the apparent reason why my IOC doesn't have the customary
commandline editing and history for my ARM CPU IOC. As I explored the
setup, I saw that readline was not being used, and so I set about to get
it installed.

On a Linux-x86 build host, using the cross-compiler I use for building
EPICS, I built both the readline & curses libraries, and installed those
in a suitable location on the build host. To the file
base/configure/os/CONFIG_SITE.linux-x86.linux-arm_el, I added:
COMMANDLINE_LIBRARY = READLINE
LDLIBS_READLINE = -lreadline -lcurses
USR_LDFLAGS += -L $(GNU_DIR)/lib
$(GNU_DIR) points to the base of my cross compiler, and the readline &
curses libs are installed there. When I then try to build the ARM IOC,
the buuld fails with:
/usr1/local/aux/CrossDevel/arm-rn100707ctng170-linux-gnu/bin/arm-rn100707ctng170-linux-gnu-g++ -o softIoc

 -L/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el
-Wl,-rpath,/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el
-Wl,-rpath-link,/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el 
 -L /usr1/local/aux/CrossDevel/arm-rn100707ctng170-linux-gnu/lib
-L/usr1/local/aux/CrossDevel/arm-rn100707ctng170-linux-gnu/arm-rn100707ctng170-linux-gnu/lib 
 softIoc_registerRecordDeviceDriver.o softMain.o

-lrecIoc -lsoftDevIoc -lmiscIoc -lrsrvIoc -ldbtoolsIoc -lasIoc
-ldbIoc -lregistryIoc -ldbStaticIoc -lca -lCom
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

NOTE: No -lreadline &/or -lcurses

>
/usr1/local/aux/CrossDevel/arm-rn100707ctng170-linux-gnu/bin/../lib/gcc/arm-rn100707ctng170-linux-gnu/4.2.1/../../../../arm-rn100707ctng170-linux-gnu/bin/ld:
warning: libreadline.so.6, needed by
/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/librecIoc.so,
not found (try using -rpath or -rpath-link)

/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/libCom.so: undefined reference to `stifle_history'
/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/libCom.so: undefined reference to `readline'
/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/libCom.so: undefined reference to `rl_insert'
/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/libCom.so: undefined reference to `add_history'
/usr1/local/epics/release/R3.14.10/base-arm/lib/linux-arm_el/libCom.so: undefined reference to `rl_bind_key'
collect2: ld returned 1 exit status

Using 'nm' I see that the undefined references would be satisfied by
libreadline.so.
So the build isn't trying to link the readline or curses libraries. How
do I make it do so? Will that be enough to get full commandline editing
working in my IOC?
Thanks.
Rod Nussbaumer
ISAC Controls, TRIUMF
Vancouver, Canada

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System