[Discuss-gnuradio] Linking gr-digital in OOT Module (Success on OSX, fails on Linux)

[Garver, Paul W]

I’ve got an out-of-tree module which uses gr-trellis and gr-digital. In the 
root OOT module directory’s CMakeLists.txt I’ve added:

set(GR_REQUIRED_COMPONENTS RUNTIME TRELLIS DIGITAL)

I’ve got a Mac OS X and Linux setup. On the MAC setup ( GR 
v3.7-MacPorts-devel-git-e106376b(20160809)), the OOT module compiles and 
executes as expected. However, on the Linux setup (GR v3.7.10.1-144-g7b0dfd80) 
I get the "AttributeError:’module’ object has no attribute” error.

Running a Python session on Linux, importing the OOT module, and doing dir() 
yields none of the functions in the OOT module.

The odd thing is that the OS X compilation is clearly linking 
libgnuradio-digital as found by
# otool -L 

BUT using ldd on the Linux compiled version does NOT show linking to 
libgnuradio-digital

I’m thinking that not linking gr-digital is causing this issue. It is the exact 
same code. My understanding is that adding DIGITAL as shown above is sufficient 
for correct linkage, but it isn’t linking in Linux. Is there any reason I would 
need to explicitly add the digital library to CMakeLists in lib/? 

PWG