Xcode 7 does not build project with opencv 3.0.0 framework

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I can't build project with a new version of the opencv 3.0.0 framework (version 2 did not have this problem). Xcode 7 does not compile c++ sources as c++.

Here's the simplest setup that is not building:

1. Download the 3.0.0 framework from here http://netix.dl.sourceforge.net/proje...
2. Create the simplest ios project with Swift language.
3. Drag-and-drop the framework to the project.
4. Create the Objective-C++ source and headers and add them to the project.
5. Create the bridging header.

Here's the setup:

1. Build.

And here's what the compiler says:

opencv2.framework/Headers/core/base.hpp:49:4: error: base.hpp header must be compiled as C++

Why is that? I've got the .mm file and it is supposed to compile as the Objective-C++ source.