Experimental Physics and
Industrial Control System

John Dobbins <[email protected]> · Fri, 16 Nov 2007 09:12:25 -0500

I neglected to mention the device support code is C++. The library header files
did not have #ifdef __cplusplus ....
Once I fixed that it was easy. Thanks for the nifty build system. I always dread
that it will stop working in some way I don't understand but it makes life so easy!

John

---------------------------------------------------
disclaimer - pardon me if I'm being stupid here
I am trying to build device support based on a library external to EPICS for a
softIOC on linux.
Call the external library libXXX = /path_to_libXXX/libXXX.so
In the src directory for devXXX_SUPPORT I edit the Makefile to add the lines
USR_INCLUDES += -I/path_to_XXX_related_include_files/
XXX_DIR = /path_to_libXXX/
devXXX_SUPPORT_LIBS += XXX

Device support then builds OK.
I do ldd libdevXXX_SUPPORT.so and see it depends on libXXX.so
However, I next try to build an IOC to test the newly created device support but
I can't figure out how to do this correctly.
I edit RELEASE for the testIOC to point to device support.
In the src directory for testIOC I edit Makefile to add the line:
testIOC_LIBS += devXXX_SUPPORT

but that is not enough because I get errors on link of testIOC of the type
libdevXXX_SUPPORT.so: undefined reference to some function from libXXX
I have tried indicating the location of libXXX in the testIOC Makefile but that
doesn't seem to help, or I am doing it incorrectly.
Guidance would be appreciated.

John Dobbins
Cornell University

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System