@import error in iOS project with .mm extension file

Question

Created Nov ’17

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I am trying to integrate to iOS framework to Unity project as a plugin. I follow this tutorial.

My problem is when my project has .mm file for bridging between iOS and Unity, I have error like

"Use of @import when C++ modules are disabled"

etc. in normal .m file.

If I delete .mm file, all errors disappeared.

All errors are shown in the following image

Here is some discussion for that, but I can't find

Enable the modules

in my XCode's

Build Settings

. My XCode is 8.3.3.

Some people say to enable -fcxx-modules flag, but where can I enable the flag in XCode?

How can I solve the error?

Answered by DTS Engineer in 280957022

C++ does not currently support modules, and

@import

relies on module support. To import a framework from C++ you’ll have to do it old school, using

#include

. So, replace this:

@import MyFancyFramework;

with

#include <MyFancyFramework/MyFancyFramework.h>

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

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Answer 1

DTS Engineer OP

Apple

Dec ’17

Accepted Answer

C++ does not currently support modules, and

@import

relies on module support. To import a framework from C++ you’ll have to do it old school, using

#include

. So, replace this:

@import MyFancyFramework;

with

#include <MyFancyFramework/MyFancyFramework.h>

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

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