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POHow to use precompile header with boost::asio
 

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  1. POHow to use precompile header with boost::asio
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    <p>I have a project that has some <code>main.cpp</code> and the following precompile header:</p> <pre><code> &lt;!-- language: lang-cpp --&gt; #ifndef PRECOMPILE_H #define PRECOMPILE_H #include &lt;iostream&gt; #include &lt;string&gt; #include &lt;vector&gt; #include &lt;boost\asio.hpp&gt; #include &lt;boost\bind.hpp&gt; #include &lt;boost\asio\ssl.hpp&gt; #include &lt;boost\locale.hpp&gt; #include &lt;boost\algorithm\string.hpp&gt; #endif </code></pre> <p>If the project is <code>*.lib</code>, it always builds normally.</p> <p>If project the is <code>*.exe</code>:<br> When build with <code>Create (/Yc)</code>, all ok.<br> When setting <code>Use (/Yu)</code> <strong>I get linker error</strong> <code>LNK2001</code>:</p> <blockquote> <p>1) unresolved external symbol "private: static class boost::asio::detail::tss_ptr::context> boost::asio::detail::call_stack::top_" (?top_@?$call_stack@Vstrand_impl@strand_service@detail@asio@boost@@E@detail@asio@boost@@0V?$tss_ptr@Vcontext@?$call_stack@Vstrand_impl@strand_service@detail@asio@boost@@E@detail@asio@boost@@@234@A)</p> <p>2) unresolved external symbol "public: static class boost::asio::detail::service_id boost::asio::detail::service_base::id" (?id@?$service_base@Vselect_reactor@detail@asio@boost@@@detail@asio@boost@@2V?$service_id@Vselect_reactor@detail@asio@boost@@@234@A)</p> <p>3) unresolved external symbol "public: static class boost::asio::detail::service_id boost::asio::detail::service_base::id" (?id@?$service_base@Vstrand_service@detail@asio@boost@@@detail@asio@boost@@2V?$service_id@Vstrand_service@detail@asio@boost@@@234@A)</p> <p>4) unresolved external symbol "public: static class boost::asio::detail::service_id > > boost::asio::detail::service_base > >::id" (?id@?$service_base@V?$deadline_timer_service@Vptime@posix_time@boost@@U?$time_traits@Vptime@posix_time@boost@@@asio@3@@asio@boost@@@detail@asio@boost@@2V?$service_id@V?$deadline_timer_service@Vptime@posix_time@boost@@U?$time_traits@Vptime@posix_time@boost@@@asio@3@@asio@boost@@@234@A)</p> </blockquote> <p>Boost: v1_49 static /MTd</p>
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    1. COHow exactly are you using PCH here? You need to link in the `/Yc` object file that is output from the precompiled header build, with the rest of the object files (the ones built using `/Yu`). See here for a similar question: http://stackoverflow.com/questions/998881/scons-boostasio-windows-precompiled-headers-and-linker-errors
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      1. USSteve Townsend
    2. COI do not understand which object must link to other objects. For clarify: when delete all places where using `asio` library (_from source and precompile header_) and add something other from boost in precompile header (for example: `boost::bind`) all works fine. If you look to the error - we have only asio errors other include files visual studio see and work fine.
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      1. USDeadWarlock
    3. COIf your precompiled header is called `PCH.H` you also should have a `PCH.CPP` file that gets compiled with `/Yc` and linked (as `PCH.OBJ`) to all the others that you compile with `/Yu`.
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