Re: [Discuss-gnuradio] Need help with gr how to create a signal processing block template

[H.Raza]

Thanks a lot for the reply Tom, I figured out that part after looking at a
number of sample Makefile.am files in different projects. I used the -I<dir>
flag to include the directories and the compilation began, but after a few
steps I received the following error. 

====================== from Terminal===================
libtool: link: g++ -g -O2 -g -O2 -o .libs/test_all test_all.o 
./.libs/libgnuradio-howto-qa.a
/home/user/Downloads/gr-howto-write-a-block-template/lib/.libs/libgnuradio-howto.so
-L/usr/local/lib -L/usr/lib /usr/lib/libcppunit.so -ldl -lboost_thread-mt
-lrt -lboost_date_time-mt /usr/local/lib/libgnuradio-core.so
/usr/local/lib/libgruel.so /usr/lib/libfftw3f.so -lgsl -lgslcblas -lm
/usr/local/lib/libgromnithread.so -pthread
/home/user/Downloads/gr-howto-write-a-block-template/lib/.libs/libgnuradio-howto.so:
undefined reference to `libmatinvTerminate'
/home/user/Downloads/gr-howto-write-a-block-template/lib/.libs/libgnuradio-howto.so:
undefined reference to `mclTerminateApplication_proxy'
/home/user/Downloads/gr-howto-write-a-block-template/lib/.libs/libgnuradio-howto.so:
undefined reference to `mclInitializeApplication_proxy'
/home/user/Downloads/gr-howto-write-a-block-template/lib/.libs/libgnuradio-howto.so:
undefined reference to `libmatinvInitialize'
collect2: ld returned 1 exit status
=======================================================

In the above errors libmatinv is the name of my generated library from
matlab mcc. The library is already in the lib folder. The C driver
implementation is also in the lib folder inside generalwork function
implementation.

I have been searching around for this error and I heard from someone that I
might have to use -L<dir> and "small L"-l<dir> flags to give the compiler
the implementation of the functions in my library header, along with the
-I<dir> but I am not exactly sure which files does it need. Any suggestions
in this regard are highly appreciated.

Also Tom you mentioned M4 config files, I am planning to release these later
on once my target is achieved. Would you kindly guide me a little, so I have
a decent idea where to start learning about these files and then take it 1
step at a time. Thanks again.


Tom Rondeau wrote:
> 
> On Sat, May 22, 2010 at 5:52 PM, Nick.R <address@hidden> wrote:
>>
>> I am quite new to unix as well as GNU radio, but after practising with
>> the
>> different modules and reading alot about it in papers and tutorials I've
>> been able to understand how to use some of its functions. Presently I am
>> trying to make a block in GNU Radio Companion from a C shared library
>> file
>> generated from Matlab.
>>
>> I've been following the tutorial on how to create a signal processing
>> block
>> and I believe my files are ready, also I have edited most of the scripts
>> as
>> per requirements. However, when I try to do "make"/"sudo make" after
>> ./bootstrap and ./configure, the compiler is unable to build because it
>> cannot find one of the matlab libraries that are a dependency for my .h
>> and
>> .cc file. I've tried looking everywhere on forums for a solution but
>> there
>> is no information regarding this. The library files in question are the
>> mclmcrrt.h and mclcppclass.h. Matlab used them to compile the shared
>> library
>> so the path I set for them in bashrc seems correct. When I do "locate" I
>> can
>> find the libraries as well.
>>
>> Following error is generated and then it says that all subsequent
>> functions
>> being used in the .cc file being not initialized and stops.
>> In file included from ./howto_square_ff.h:26,
>>                 from howto_square_ff.cc:32:
>> ./libmyfunc.h:14:22: error: mclmcrrt.h: No such file or directory
>> ./libmyfunc.h:15:25: error: mclcppclass.h: No such file or directory
>>
>> I'm on Ubuntu 9.10 - the Karmic Koala release
>>
>> Is there something specific that needs to be done for the "make"
>> procedure
>> to read these libraries ? Any help in this regard will be highly
>> appreciated. This is my first time posting here, so I hope I was able to
>> convey as much information as possibly regarding the problem.
> 
> 
> You will have to edit the Makefile.am to add the source code directory
> to include the two missing header files into the local make
> environment. The simplest thing to do is to add this to "AM_CPPFLAGS"
> in Makefile.am: "-I<dir>" where <dir> is the directory of the files.
> 
> This isn't the most elegant way to handle this, and if you are
> planning on releasing this or using this code in a more
> production-oriented fashion, we'll have to talk about M4 config files
> and the such. But start here and see if it works.
> 
> Tom
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 

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