Xcode compile error when using .Net 4.6 backend in Unity

[IDobrinescu]

After i (successfully) build my Unity project, the demo project fails to compile:

/Users/ionutdobrinescu/Development/UnityIntegration/V2/iOSProject/DemoApp/Unity/Classes/Native/Bulk_System.Configuration_0.cpp:25861:85: error: no member named 'Configuration' in namespace 'il2cpp::icalls::System'
return ((InternalConfigurationHost_get_bundled_app_config_m1191888808_ftn)System::Configuration::System::Configuration::InternalConfigurationHost::get_bundled_app_config) ();

I have some external frameworks that i use and i tried to link them but this doesn't seem to be the problem.

Do you have any ideea how to solve this?

[jiulongw]

This looks weird: System::Configuration::System::Configuration.

Which Unity / Xcode version do you use?

In Unity, which .net framework version did you use?

When building Unity, did you choose "Append" or "Replace"?

My gut feeling is the il2cpp files are messed around in the Native folder. Try to create a clean unity build. If not, I'd be happy to take a look at your project to repro it (if you don't mind).

[jiulongw]

I deleted original comment regarding building unity project directly... It was for another issue. I posted in the wrong thread.

[IDobrinescu]

Ok, after some more testing i found out that using .Net 4.6 seems to cause this problem. I tested it using Unity 2017.3.f02 and Unity 2017.3.f03 with the same results. Unfortunately my Unity project uses .Net 4.6 and it would be really hard to go back to 3.5. Is there a way to solve this problem?
Note: I use Xcode 9.2
Also you can reproduce this issue on your demo app too, just change the .Net version to 4.6

[jiulongw]

Yes. There is a comment in Unity.xcconfig which reads:

// If using .net 4.0 in Unity, append -DNET_4_0 to OTHER_CFLAGS

[jiulongw]

If vanilla Unity project can be built but Swift project throws errors. Usually it is caused by different compiler / linker flags...

[jiulongw]

Feel free to re-open this issue if you still have problems.