Open Radar

 
Summary:
Given an iOS + watchOS project with a shared framework with the following xcconfig:

```
PRODUCT_NAME = $(TARGET_NAME)
SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator
DYLIB_INSTALL_NAME_BASE = @rpath
OTHER_SWIFT_FLAGS = -DXcode

SDKROOT[sdk=iphone*] = iphoneos
VALID_ARCHS[sdk=iphone*] = arm64 armv7 armv7s
IPHONEOS_DEPLOYMENT_TARGET = 10.0
TARGETED_DEVICE_FAMILY[sdk=iphone*]  = 1,2
LD_RUNPATH_SEARCH_PATHS[sdk=iphone*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks

SDKROOT[sdk=appletv*] = appletvos
TVOS_DEPLOYMENT_TARGET = 10.0
TARGETED_DEVICE_FAMILY[sdk=appletv*] = 3
LD_RUNPATH_SEARCH_PATHS[sdk=appletv*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks

SDKROOT[sdk=watch*] = watchos
WATCHOS_DEPLOYMENT_TARGET = 3.0
TARGETED_DEVICE_FAMILY[sdk=watch*] = 4
LD_RUNPATH_SEARCH_PATHS[sdk=watch*] = $(inherited) @executable_path/Frameworks @loader_path/Frameworks

SDKROOT[sdk=macosx*] = macosx
VALID_ARCHS[sdk=macosx*] = x86_64
MACOSX_DEPLOYMENT_TARGET = 10.13
LD_RUNPATH_SEARCH_PATHS[sdk=macosx*] = $(inherited) @executable_path/../Frameworks @loader_path/../Frameworks
```

Xcode produces the following warning:

```
Target 'SharedFramework' of project 'UniversalFramework' was rejected as an implicit dependency for 'SharedFramework.framework' because its SDK is platform 'com.apple.platform.iphoneos' and it needs to match platform 'com.apple.platform.watchos'
```

alongside the following linker error:

```
ld: framework not found SharedFramework
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

I have attached a sample project with each setup step committed into git.

Steps to Reproduce:
Build the sample project either using "Build all" aggregate target or going through targets one by one.

Expected Results:
Builds successfully

Observed Results:
Linker error for watchOS target.

Interestingly the macOS target works fine with the shared framework.

Version:
Xcode 8, Xcode 9