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POcmake, boost::filesystem linking error (undefined directory_iterator.operator!=)
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  1. POcmake, boost::filesystem linking error (undefined directory_iterator.operator!=)
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    copied!<p>I'm using CMake (2.8.3), Boost::filesystem(1.42.0) in Ubuntu 10.10. The code compiles OK but I keep getting the following error when linking:</p> <pre><code>CMakeFiles/sample.dir/sample.cpp.o: In function `main': sample.cpp:(.text+0x1af8d): undefined reference to `int operator!=&lt;boost::filesystem::basic_directory_iterator&lt;boost::filesystem::basic_path&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::filesystem::path_traits&gt; &gt; &gt;(boost::filesystem::basic_directory_iterator&lt;boost::filesystem::basic_path&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::filesystem::path_traits&gt; &gt; const&amp;, boost::filesystem::basic_directory_iterator&lt;boost::filesystem::basic_path&lt;std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;, boost::filesystem::path_traits&gt; &gt; const&amp;)' collect2: ld returned 1 exit status </code></pre> <p>The code in question is the following:</p> <pre><code>#include &lt;boost/filesystem.hpp&gt; #include &lt;boost/algorithm/string.hpp&gt; int main() { string folder; string extension; fs::directory_iterator end; folder = "."; extension = ".zip"; for (fs::directory_iterator i(folder); i != end; ++i) { if (fs::is_regular_file(i-&gt;status())) { if (boost::algorithm::ends_with(i-&gt;leaf(), extension)) { cout &lt;&lt; i-&gt;leaf() &lt;&lt; " has extension .zip" &lt;&lt; endl; } } } } </code></pre> <p>in my <code>CMakeLists.txt</code> file, I have:</p> <pre><code>find_package(Boost 1.4.0 COMPONENTS filesystem REQUIRED) include_directories(${Boost_INCLUDE_DIRS}) target_link_libraries(executable ${Boost_LIBRARIES}) </code></pre> <p>but I've also tried with:</p> <pre><code>set(Boost_USE_STATIC_LIBS ON) set(Boost_USE_MULTITHREADED ON) set(Boost_USE_STATIC_RUNTIME OFF) find_package(Boost 1.4.0 COMPONENTS filesystem REQUIRED) include_directories(${Boost_INCLUDE_DIRS}) target_link_libraries(executable ${Boost_FILESYSTEM_LIBRARY}) </code></pre> <p>and many other combinations of the above.</p> <p>The linker is complaining about the <code>!=</code> operator for the <code>directory_iterator</code> type. If I look to the contents of the header in <code>/usr/include/boost/filesystem/path.cpp</code> I can see that the operator is defined there. Any ideas why this is happening?</p> <p>I'd really appreciate your help.</p>
 

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