Re: [Discuss-gnuradio] Problem using FFT-class in my own written block (part II)

[jeroen]

Marcus Müller schreef op 2013-12-06 08:02:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi Jeroen,
>
> it's not advisable to use the 3.7 Out of tree-module directory
> architecture with GR 3.6.
> However, gr_modtool should be generating modules that fit exactly your
> installed version. You shouldn't have to change anything on the
> gnuradio core/runtime/gruel/whatever includes.
>
> After you have set up your new module with gr_modtool, just copy over
> the original GNU Radio FindFFTWf.cmake into the cmake/Modules 
> directory,
> and use FindPackage(FFTWf) as well as add the found directories to
> your target link libraries and the found includes to your include
> directories; see my reply to Johannes Demel's post of yesterday.
>
> Greetings, and happy hacking!
>
> Marcus
>
> On 05.12.2013 21:30, Jeroen Boschma wrote:
> > Hello all,
> >
> > In order to keep discussions separated (I apparently did something
> > stupid which mixed up 2 threads), I start a new thread here.
> >
> > Summarizing: when writing my own out of tree block in C++ using
> > FFTs (including the 'fft/fft.h' header) and following the tutorial
> > "Out-of-tree modules", I get an error when I want to use the block
> > in GNU Radio Companion:
> >
> > ImportError /usr/local/libgnuradio-MY_MODULE.so: undefined symbol:
> > fft_complex
> >
> > According to Tom Rondeau the FFT-library is not included in the
> > link process, and he suggested the following tutorial:
> >
> > http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig
> >
> >  I started following that tutorial, setting some environment
> > variables first, and I found out that I am using version 3.6.5git
> > (on an Ettus Research USB stick) while I suspect that the suggested
> > tutorial only covers versions >= 3.7.
> >
> > Even when I only changed the following (as suggested by the
> > tutorial):
> >
> > find_package(GnuradioCore)
> >
> > into:
> >
> > set(GR_REQUIRED_COMPONENTS CORE) find_package(Gnuradio "3.6.5"
> > REQUIRED)
> >
> > I get the following error when I run "cmake ../" from the
> > build-directory:
> >
> > ================================================= -- Build type not
> > specified: defaulting to release. -- Boost version: 1.49.0 -- Found
> > the following Boost libraries: --   filesystem --   system CMake
> > Error at CMakeLists.txt:92 (find_package): By not providing
> > "FindGnuradio.cmake" in CMAKE_MODULE_PATH this project has asked
> > CMake to find a package configuration file provided by "Gnuradio",
> > but CMake did not find one.
> >
> > Could not find a package configuration file provided by "Gnuradio"
> > (requested version 3.6.5) with any of the following names:
> >
> > GnuradioConfig.cmake gnuradio-config.cmake
> >
> > Add the installation prefix of "Gnuradio" to CMAKE_PREFIX_PATH or
> > set "Gnuradio_DIR" to a directory containing one of the above
> > files. If "Gnuradio" provides a separate development package or
> > SDK, be sure it has been installed.
> > =================================================
> >
> > So I tried (as suggested by the error message):
> >
> > 1) set CMAKE_MODULE_PATH to the path where
> > "FindGnuradio.cmake"resides 2) add the installation prefix of
> > "Gnuradio" to CMAKE_PREFIX_PATH
> >
> > The two mentioned config .cmake files are not even present on the
> > environment I am working on (not found by a search at the GNU
> > radio installation prefix which is usr/local).
> >
> > So I am pretty stuck here.  My goal is to get this working in my
> > current environment before trying to port my blocks to the latest
> > version > 3.7. Any help is greatly appreciated.
> >
> > Best regards,
> >
> > Jeroen Boschma
> >
> >
> > _______________________________________________ Discuss-gnuradio
> > mailing list address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.15 (GNU/Linux)
> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
>
> iQEcBAEBAgAGBQJSoXahAAoJEAFxB7BbsDrLi2QH/AmKmrZNZYn7BIz7snz/eu0G
> X4e2u++r7UJ8M3ty4PB33txGDT83LNlvVLXhHWjnl6BPKClaEezmU6iYLsCSOyKA
> otFUvzUw5lc7Q4KgM1aS6KVCCCPczbKWIHGm2d4+4octnabIx1NfuKgeSwwSUdX/
> BFXw3q/mjRQpHGXKD+lkcJgCUYLXerLNQd9YCYsY9XxQJL855rBIQd7QEUBi3GXB
> c+Foq1/+wVWWbOx+Za1XGkBgmjIIzmQSqwsNLatIhEEbZTseVRH8eJ8UUq4IJSRX
> sAVaI3k4j6SvvtNC+EMSee8/kdxj08OlmrNLYrWaU9y9wA/pG0R9PXWwGf3n7Sw=
> =CYIj
> -----END PGP SIGNATURE-----
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Thanks for your reply Marcus. It did help me a bit, but results are not 
yet there... So what I did:

1) I Copied the FindFFTW3f.cmake into the cmake/Modules dir of my 
module.
2) In the top-level CMakeLists.txt I modified/added (just guessing what 
to do...):

find_package(FFTW3f)                # added this

include_directories(
    ${CMAKE_SOURCE_DIR}/include
    ${Boost_INCLUDE_DIRS}
    ${GRUEL_INCLUDE_DIRS}
    ${CPPUNIT_INCLUDE_DIRS}
    ${GNURADIO_CORE_INCLUDE_DIRS}
    ${FFTW3F_INCLUDE_DIRS}          # added this, I checked that it 
actually points to an include dir
)

link_directories(
    ${Boost_LIBRARY_DIRS}
    ${GRUEL_LIBRARY_DIRS}
    ${CPPUNIT_LIBRARY_DIRS}
    ${GNURADIO_CORE_LIBRARY_DIRS}
    ${FFTW3F_LIBRARY_DIRS}          # added this, is an empty variable
)

3) In the module CMakeLists.txt I modified/added (again just guessing 
what to do...):


########################################################################
# Setup library
########################################################################
target_link_libraries(gnuradio-LTE_jamming ${Boost_LIBRARIES} 
${GRUEL_LIBRARIES} ${GNURADIO_CORE_LIBRARIES} ${FFTW3F_LIBRARIES})  # 
added last one

########################################################################
# Build and register unit test
########################################################################
target_link_libraries(
  test-LTE_jamming
  ${GNURADIO_CORE_LIBRARIES}
  ${Boost_LIBRARIES}
  ${CPPUNIT_LIBRARIES}
  ${FFTW3F_LIBRARIES}                # added this, I checked that it 
actually points to an .so file
  gnuradio-LTE_jamming
)

All of this is just a wild guess of me: I see something refering to, for 
example, ${CPPUNIT_LIBRARIES} and I conclude that there is a chance that 
${FFTW3F_LIBRARIES} should also be there....

But after (from build dir):

  cmake ../
  make
  sudo make install
  sudo ldconfig

I still get the error:

    ImportError: /usr/local/lib/libgnuradio-LTE_jamming.so: undefined 
symbol: _ZN2gr3fft11fft_complexC1Eibi

Did I forget something? Hacking is difficult when you don't fully 
understand what's going on....

Best regards,

   Jeroen