[SR-591] [build-script] Build fails if appletvos SDK is not present

[vedantk]

Previous ID	SR-591
Radar	None
Original Reporter	@vedantk
Type	Bug
Status	Resolved
Resolution	Invalid

Additional Detail from JIRA

Votes	0
Component/s	Project Infrastructure
Labels	Bug
Assignee	None
Priority	Medium

Watchers: @shahmishal

md5: f72ea8ba33214484ec20df40f9d33ba4

Issue Description:

swift/utils/build-script fails after compiling llvm if the appletvos SDK is missing. Since I did not pass --tvos to build-script, I expect to not need the TVOS SDK.

I'm using the standard directory layout (/swift, /clang, /llvm, and /cmark at the top-level). My build command is:

SWIFT_SOURCE_ROOT=/Users/vk/github-swift ./swift/utils/build-script -d --llvm-assertions --swift-assertions --build-subdir Debug+Asserts -j 6

The build fails with:

xcodebuild: error: SDK "appletvos" cannot be located.
xcodebuild: error: SDK "appletvos" cannot be located.
xcrun: error: unable to lookup item 'Path' in SDK 'appletvos'
CMake Error at cmake/modules/SwiftConfigureSDK.cmake:73 (message):
tvOS SDK not found at .
Call Stack (most recent call first):
CMakeLists.txt:493 (configure_sdk_darwin)

• • Configuring incomplete, errors occurred!
    See also "/Users/vk/github-swift/build/Debug+Asserts/swift-macosx-x86_64/CMakeFiles/CMakeOutput.log".
    ./swift/utils/build-script: command terminated with a non-zero exit status 1, aborting

[shahmishal]

To build swift:
https://swift.org/download/#latest-development-snapshots
Requirements for Tools
OS X 10.11 (El Capitan)
Xcode 7.2 or later

Xcode 7.2 or later contains tvOS SDKs.