Can't find entry point

Question

I wanted to create an new c++ project and start coding. I am working in an existing solution with 30+ projects in it. So instead of main() GwMain(..) is used. This works for all other files but not when I create a new c++ project. I get a linker error:

LNK2019 unresolved external symbol _main referenced in function "int__cdel invoke_main(void)" (?invoke_main@@YAHXZ)

File: MSVCRTD.lib(exe_main.obj)

• I already compared the property configs with the other projects and it is nearly the same. The solution is migrated from visual studio 2012 to 2019 I guess this is one of the reasons why it is not working how it should.

• I checked already this: Linker->System->SubSystem -> Windows.

  And when I change it from console to windows it shows this:

  LNK2019 unresolved external symbol _WinMain referenced in function "int__cdel invoke_main(void)" (?invoke_main@@YAHXZ)

• And I do not use cmake
• When I use int main(){return 0;} I get no errors, but I have to use GwMain()
• When I change Under Advanced the EntryPoint I actually get more errors. I tried to insert GwMain.

The code is just like this:

#include <gwcore.hpp>
#include <gw.hpp>

int GwMain(int, char**)
{

    return 0;
}

Grit is used here a very old framework.

Answer 1

After checking all the compilation and linking options with other projects that work fine.

From your solution, select a project that works (and that uses GwMain). Right button-> property and check its dependencies in "common properties":

Do this manipulation on the other projects that work correctly (and that use GwMain) and try to see if there is a common dependency which allows them to use GwMain, then, try to add this dependency to your project that does not work

Answer 2

Please check Project > Properties > General > Project Defaults > Configuration Type.

If this is ".exe" then a main is needed for this project. Else if this is ".dll" or ".lib" your code should compile.