How to use precompile header with boost::asio

Question

I have a project that has some main.cpp and the following precompile header:

 <!-- language: lang-cpp -->
 #ifndef PRECOMPILE_H
 #define PRECOMPILE_H
 #include <iostream>
 #include <string>
 #include <vector>
 #include <boost\asio.hpp>
 #include <boost\bind.hpp>
 #include <boost\asio\ssl.hpp>
 #include <boost\locale.hpp>
 #include <boost\algorithm\string.hpp>
 #endif

If the project is *.lib, it always builds normally.

If project the is *.exe:
When build with Create (/Yc), all ok.
When setting Use (/Yu) I get linker error LNK2001:

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)

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)

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)

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)

Boost: v1_49 static /MTd

How 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 — Steve Townsend, May 21 '12 at 14:59
I 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. — DeadWarlock, May 21 '12 at 16:00
If 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`. — Steve Townsend, May 21 '12 at 16:05
Thank you very much Steve Townsend it is works. You open my eyes and save my life. Now i do not understand why it works in other cases. — DeadWarlock, May 22 '12 at 07:24
OK, I've added this as an answer for future reference. Glad to hear it's sorted out now. — Steve Townsend, May 22 '12 at 10:51

score 3 · Accepted Answer · answered May 22 '12 at 10:50

If 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.

For the other cases that work, perhaps this is because nothing static from the Boost headers has to get exported from the precompiled header object file.

How to use precompile header with boost::asio

1 Answers1