Swift had fatal errors constructing the ast context for this module

I’m having the same issue in my project. The error that lldb spits out when attempting to po an object highlights the issue:

(lldb)po fileURL
warning: Swift error in module <APP_NAME>:
    Swift had fatal errors constructing the ast context for this module: <module-includes>:1:9: note: in file included from <module-includes>:1:
#import "Headers/Crashlytics.h"
        ^
<APP_PATH>/Pods/Crashlytics/Crashlytics.framework/Headers/Crashlytics.h:10:9: error: include of non-modular header inside framework module 'Crashlytics'
#import <Fabric/FABAttributes.h>
        ^

The Crashlytics.h umbrella header in Crashlytics.framework is importing Fabric/FABAttributes.h, which is not part of the Crashlytics module (i.e. not in its module.modulemap). This is Crashlytics 3.1.0 installed using CocoaPods.

Why Xcode 7 treats this as a fatal error is beyond me (it was just a warning in 6). In Xcode 6 you could work around this sort of “non-modular header include” by enabling the “Allow Non-modular includes in Framework Modules” (CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES) build setting in your application target.

I’ve had no luck getting the Xcode 7 betas to honor the above flag (rdar://22044453 <– please dup).

The only solution I’ve found to get the debugger working is to remove the Crashlytics pod. I comment out the Crashlytics and Fabric pods, run pod install, resume debugging and then reinstall the pods before a release.

I really hope this is fixed in Xcode 7 by the time it comes out of beta.