Xcode 8 Does Full Project Rebuild

Xcode 8 does full project rebuild

I have found this works consistently, it will however compile swift files if you modify a header included in the bridging header. It will also do full compile if you switch git branches back and forth.

Firstly make sure optimization level for debug is set to None (Not whole module optimization)
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Then, according to https://forums.developer.apple.com/thread/62737 Apple Staff (ddunbar):

We believe that setting:
HEADERMAP_USES_VFS = YES
to true in your project (or for all your targets) may be an effective workaround > for many people. This is not guaranteed to work (which is the reason it isn't > already on by default), but it should work for most projects.

This should be added through "Add user-defined setting" under your target Build Settings.

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Xcode 6.3 always does full rebuild of Swift project

I think that this is what you searching for
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Control whether XCode does minimal or full rebuild

Xcode always does a minimal build - to do a full build you need to do a clean before the build.

How to prevent Xcode from rebuilding project every time

There is actually an option in Xcode to run without building the code first. Select the "Run Without Building" option under Product > Perform Action. The hotkey for this is ctrl + cmd + R.

Xcode 8 Does Full Project Rebuild