Problem solved : building device support on external library - help needed

[John Dobbins <john.dobbins@cornell.edu>]

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


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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