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

[Garver, Paul W]

The other interesting thing is that dir() on the module returns practically nothing.

['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__']

However, the functions are there in the modulename_swig.py script, and symbols related to the functions can be found with nm on _modulename_swig.so. I also checked that the GNURADIO_ALL_LIBRARIES variable in cmake is identical between the two builds and actually contains the DIGITAL libs, although it doesn't actually link them. Very strange.

The wrapped code is so obfuscated it is difficult to really see what is happening.

PWG

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From: Discuss-gnuradio <discuss-gnuradio-bounces+address@hidden> on behalf of Garver, Paul W <address@hidden>
Sent: Saturday, November 12, 2016 5:36:28 PM
To: Michael Dickens
Cc: GNURadio Discussion List
Subject: Re: [Discuss-gnuradio] Linking gr-digital in OOT Module (Success on OSX, fails on Linux)

 

Hi Michael,

Thanks for the tip. I've done this to no avail. Is there a way to get some more useful error output? Seems like a SWIG thing, and I don't know too much about how it works other than it wraps c/c++ functions.

Paul Garver


> On Nov 12, 2016, at 4:48 PM, Michael Dickens <address@hidden> wrote:
>
> Hi Paul - You are correct that adding "DIGITAL" as you write should add
> that component in for headers and library linking. Did you clean the
> build directory after changing this setting? Sometimes CMake won't redo
> the linkage internally, and one just has to "rm -rf" the whole build
> directory and start from go. Hope this is useful. - MLD
>
>> On Sat, Nov 12, 2016, at 02:55 PM, Garver, Paul W wrote:
>> 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/?

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