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

[Marcus Müller]

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