[SR-2027] build-script -x fails during building of SwiftShims

[beccadax]

Previous ID	SR-2027
Radar	None
Original Reporter	@beccadax
Type	Bug

Environment

OS X 10.11.5 (15F34), MacBook Pro (Retina, 15-inch, Late 2013), Xcode Version 8.0 beta 2 (8S162m)

Additional Detail from JIRA

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

md5: d1f70e4668dbe43b833dce4c9a7ef89a

Issue Description:

On my machine, utils/build-script -c -x fails with the error "Clang headers were not found" from stdlib/public/SwiftShims/CMakeLists.txt line 65.

Investigation showed that CMAKE_CFG_INTDIR contained xcodebuild-style $(...) variables which were not being substituted before the "if(EXISTS …)" call. The change at <beccadax@2db328fa48d90be530f2fa4cff1034b8bc2dc35d\> corrects this issue for me, although it feels a little hacky and I have zero CMake experience, so there may be a better solution.

[belkadan]

@gottesmm has been working on this. Deleting the CMakeCache.txt files in the subdirectories of your build directory (llvm-macosx-x86_64 and swift-macosx-x86_64) might make your build go through; if not that then a delete-build-folder clean build.