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> 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 Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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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
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