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POVC++ Calling a function of /clr project from a function of non /clr project within a solution
 

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    <p>I referred <a href="https://stackoverflow.com/questions/3994073/calling-a-function-from-a-win32-lib-project-with-clr-from-a-project-that-is-a">this somewhat similar question</a> before asking this, but unable to solve my problem</p> <p>I am looking at an old application with many solutions. The problem is happening in one of the solutions (say S). Here is the situation:</p> <ul> <li>A project (say P1) inside S has all C/C++ files and needs to call a C# function</li> <li>Since P1 also contains .c files, I can't use <code>/clr</code> option with that</li> <li>If I compile the .c files in P1 as .cpp files then it generates lots of errors, I don't intend to change the source in that legacy .c file</li> <li>So I created another project (say P2) with <code>/clr</code> enabled and created one header file for function declaration and a .cpp file for the function definition; The C# call is made under it; P2 compiles fine</li> <li>Note that P1 is a .dll and P2 is created as a static library;</li> <li>P2 is mentioned under the P1's "Framework and refernces"</li> </ul> <p>and a warning:</p> <blockquote> <p>warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library</p> </blockquote> <p>Now with all these, I get 3 linker errors in P1:</p> <blockquote> <p>error LNK2005: "private: __thiscall type_info::type_info(class type_info const &amp;)" (??0type_info@@AAE@ABV0@@Z) already defined in libcmtd.lib(typinfo.obj)</p> <p>error LNK2005: "private: class type_info &amp; __thiscall type_info::operator=(class type_info const &amp;)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in libcmtd.lib(typinfo.obj)</p> <p>error LNK1169: one or more multiply defined symbols found</p> </blockquote> <p>This error is available at many online forums including this website. But somehow I am not able to fix it after trying those options (I am new to .NET framework).<br> Important point is that, even if I remove the C# code from P2 then also the same error appears.</p> <p>What is the correct way to fix it? </p> <p><strong>Update</strong>:</p> <p>P2 just contains 1 header file with function declaration and 1 source file with function definition which is a 1 line call to the C# method; e.g. </p> <pre><code>void Class::foo () { // A static function inside Class std::string x = marshal_as&lt;std::string&gt;(C#_function); // ... } </code></pre> <p>P2 is newly added to compile with <code>/clr</code> (Removing P2 makes the solution compile fine).<br> I am compiling both P1 and P2 with <code>/MD[d]</code> options. And the above error is thrown by P1.</p> <p>If I make P2 from static library (.lib) to dynamic linked library (.dll), then the above errors goes away. And the new linker error comes for the <code>foo</code> itself for undefined reference:</p> <blockquote> <p>error LNK2019: unresolved external symbol "public: void __cdecl Class::foo()" referred in function { some function of P1 }</p> </blockquote>
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    1. COIt's much easier to make a static library out of the native code, and pull that into a managed (C++/CLI, using `/clr`) project that makes the actual DLL. This lets you keep project settings separate for native vs managed, while having the link step aware of managed.
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    2. CO@BenVoigt, can you please put this into the answer with more details (which menu, which option and so on). If it works out well, I will be more than happy to accept it. I am new to VC++ and this is bugging me a lot! Note that in current solution S, I can't make P1 as `/clr`, due to presence of .c files.
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    3. COWell, which menu and etc will depend on which version of Visual Studio.
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