Second Definition Warning

[vermissa0ss]

I am building library A that links to library B and C. Libraries B and C individually link to boost system library. The problem is I get second definition warning\ B.lib(error_code.obj) : warning LNK4006: "void __cdecl boost::system::dummy_exported_function(void)" (?dummy_exported_function@system@boost@@YAXXZ) already defined in C.lib(error_code.obj); second definition ignored [C:\Gitlab-Runner\builds\Jdss\0\myFiles\A_Wrapper\A_Wrapper_prog\A_lib.vcxproj]

I'm using boost 1.72 on windows 10 with Visual Studio Build Engine version 16.7.0

I have tried boost 1.82 as suggested by this that newer version would fix this similar problem but still received the warning.

[pdimov]

You don't need to compile error_code.cpp into B.lib or C.lib. Boost.System is header-only and this source file is only used when building a stub library for backward compatibility.

[vermissa0ss]

Thank you for the response. I appreciate the insight, but I want to clarify that I'm not manually compiling the individual files of the Boost libraries. I'm building them using Boost's own bootstrap process, which doesn't allow me to exclude individual files like error_code.cpp.

[pdimov]

I'll need more information on how to reproduce the error, then.

[vermissa0ss]

boost_tests.zip File above contains three projects. boost_test_C is a UDP transmit using asio.\ boost_test_B is UDP receive using asio boost_test_A link to library boost_test_C and boost_test_B.

NOTE: Please change the directory for <AdditionalLibraryDirectories> and <AdditionalIncludeDirectories> from boost_test_A.vcxproj and boost_test_B.vcxproj to match where your boost header and libraries are.

[pdimov]

All three libraries compile when I remove the "Additional Dependencies" from boost_test_B and boost_test_C.

[vermissa0ss]

Thank you for taking the time to look at those files. Our team missed the transition when Boost became header-only. I will close the issue now