Re: [Discuss-gnuradio] Compilation Error of the sample code "tags_demo.cc"

Hi Zhihong Luo,

you're not linking your program against any GNU Radio component, which is why the linker step in your compiler call complains about all the symbols from these libraries missing.
Normally, it's the job of a build system to set up your compiler call correctly, but in this case, somethin like

g++ tags.cpp -o tags $(pkg-config --libs --cflags gnuradio-runtime gnuradio-uhd)

should work.

I'd still recommend not doing that, but using gr_modtool to create a new out-of-tree module

gr_modtool newmod

and add your file in the <modulename>/apps/ folder, adding the filename to <modulename>/apps/CMakeLists.txt under "sources". Add "uhd" to the list of necessary GNU Radio components in <modulename>/CMakeLists.txt

Then, it's the normal CMake build procedure:

cd <modulename>
mkdir build
cd build
cmake ..
make
make install

On 03.02.2016 09:39, Zhihong Luo wrote:

Hi Marcus,

Sorry, I was typing and accidentally sent it out the previous one... The code is 

#include<gnuradio/top_block.h>

#include<gnuradio/uhd/usrp_source.h>

#include<uhd/utils/safe_main.hpp>

#include <boost/make_shared.hpp>

#include <boost/thread/thread.hpp>

#include <boost/program_options.hpp>

#include <csignal>

#include <iostream>

namespace po = boost::program_options; int UHD_SAFE_MAIN(int argc, char *argv[]){ std::string device_addr =" "; gr::top_block_sptr tb = gr::make_top_block("tags_demo"); gr::uhd::usrp_source::sptr usrp_source = gr::uhd::usrp_source::make(device_addr, uhd::stream_args_t("fc32"));

}

Then I ran the command:

g++ tags.cpp -o tags -l boost_system

which ends up having errors:

undefined reference to gr::make_top_block, uhd::device_addr_t, gr::uhd::usrp_source and etc.

Thanks,

Zhihong Luo

On Wed, Feb 3, 2016 at 4:29 PM, Zhihong Luo <zhluo@umich.edu> wrote:

Hi Marcus,

Of course. Here are the codes:

On Wed, Feb 3, 2016 at 4:13 PM, Marcus Müller <marcus.mueller@ettus.com> wrote:

Hi Zhihong Luo,

could you please rather share text than pictures of text, too small for reading?

Best regards,
Marcus

On 03.02.2016 07:31, Zhihong Luo wrote:

Hi all,

I just started to learn to use c++ for gnuradio, and I copied some codes from the "tags_demo.cc". But compilation error occurred as shown in the following screen shots. Can you tell me where I made a mistake?

Thanks,

Zhihong Luo

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