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POCMake linking problem
 

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    <p>I am trying to use CMake to compile a C++ application that uses the C library GStreamer.</p> <p>My main.cpp file looks like this:</p> <pre><code>extern "C" { #include &lt;gst/gst.h&gt; #include &lt;glib.h&gt; } int main(int argc, char* argv[]) { GMainLoop *loop; GstElement *pipeline, *source, *demuxer, *decoder, *conv, *sink; GstBus *bus; /* Initialisation */ gst_init (&amp;argc, &amp;argv); return 0; } </code></pre> <p>This works:</p> <pre><code>g++ -Wall $(pkg-config --cflags --libs gstreamer-0.10) main.cpp -o MPEG4GStreamer </code></pre> <p>How to I make it with CMake? My CMakeLists.txt file looks like this:</p> <pre><code>cmake_minimum_required (VERSION 2.6) project (MPEG4GStreamer) add_executable (MPEG4GStreamer main.cpp) include(${CMAKE_ROOT}/Modules/FindPkgConfig.cmake) # Set CMAKE_C_FLAGS variable with info from pkg-util execute_process(COMMAND pkg-config --cflags gstreamer-0.10 OUTPUT_VARIABLE CMAKE_C_FLAGS) string(REPLACE "\n" "" CMAKE_C_FLAGS ${CMAKE_C_FLAGS}) message("CMAKE_C_FLAGS: ${CMAKE_C_FLAGS}") # Set CMAKE_LINKER_FLAGS variable with info from pkg-util execute_process(COMMAND pkg-config --libs gstreamer-0.10 OUTPUT_VARIABLE CMAKE_LINKER_FLAGS) string(REPLACE "\n" "" CMAKE_LINKER_FLAGS ${CMAKE_LINKER_FLAGS}) message("CMAKE_LINKER_FLAGS: ${CMAKE_LINKER_FLAGS}") set_target_properties(MPEG4GStreamer PROPERTIES COMPILE_FLAGS ${CMAKE_C_FLAGS} LINKER_FLAGS ${CMAKE_LINKER_FLAGS}) </code></pre> <p>Output give a linker error:</p> <pre><code>~ $ cmake . CMAKE_C_FLAGS: -D_REENTRANT -I/usr/include/libxml2 -I/opt/local/include/gstreamer-0.10 -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include CMAKE_LINKER_FLAGS: -L/opt/local/lib -lgstreamer-0.10 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lxml2 -lpthread -lz -lm -lglib-2.0 -lintl -liconv -- Configuring done -- Generating done -- Build files have been written to: /Users/francis/ ~ $ make Linking CXX executable MPEG4GStreamer Undefined symbols: "_gst_init", referenced from: _main in main.cpp.o ld: symbol(s) not found collect2: ld returned 1 exit status make[2]: *** [MPEG4GStreamer] Error 1 make[1]: *** [CMakeFiles/MPEG4GStreamer.dir/all] Error 2 make: *** [all] Error 2 ~ $ </code></pre>
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