Open Radar

 
Xcode fails to compile a framework target with Swift and ObjC if the build setting "use header map" is set to NO.

Steps to Reproduce:
Steps to Reproduce:
1. Create a new project and select 'Single View Application' as the type. Choose Objective-C as the language.

2. Add an empty Swift file

3. Go to the target build settings and set 'Use Header Maps' to NO

4. Press Product->Clean

5. Build the Framework



Expected Results:
The framework should successfully build

Actual Results:
Compiler error:

/Users/RO/Library/Developer/Xcode/DerivedData/SwiftHeaderSearchPathBug-byocisxzxhtkrjcmgvrxtpczadja/Build/Intermediates/SwiftHeaderSearchPathBug.build/Debug-iphonesimulator/FMWK1.build/unextended-module.modulemap:2:19: error: umbrella header 'FMWK1.h' not found
  umbrella header "FMWK1.h"
                  ^
<unknown>:0: error: could not build Objective-C module 'FMWK1'

Version:
MacOS Sierra 10.12.4
XCode Version 8.3.2 (8E2002)

Notes:
Similar to http://www.openradar.me/21038443

Configuration:
Except for the build setting 'Use Header Maps' everything other build setting is the default for the target.

In the sample code I created 2 framework targets for comparison:
* one is with  'Use Header Maps' to NO. And fails to build.
* the other is with 'Use Header Maps' to YES (the default). And builds ok.