Hi,

I tried to build the Swift compiler. I followed the instructions on GitHub and 
used the following command: utils/build-script -r -t
Unfortunately, the build fails on my Mac (macOS 10.12.6). I noticed that the 
README.md still lists Xcode 9.0 beta 4 as a system requirement.
However, I already updated to beta 5. Could this be the problem?

Here's the error message I get:

/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks/AVFoundation.framework/Headers/AVFoundation.h:88:9:
 error: 'AVFoundation/AVRouteDetector.h' file not found
#import <AVFoundation/AVRouteDetector.h>
        ^
/Users/tonisuter/Projects/swift-source/swift/stdlib/public/SDK/AVFoundation/AVCaptureDevice.swift:13:19:
 error: could not build Objective-C module 'AVFoundation'
@_exported import AVFoundation // Clang module
                  ^
[4/417] Generating 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift/macosx/x86_64/AVFoundation.swiftmodule
FAILED: lib/swift/macosx/x86_64/AVFoundation.swiftmodule 
lib/swift/macosx/x86_64/AVFoundation.swiftdoc 
cd 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/SDK/AVFoundation
 && /usr/local/Cellar/cmake/3.9.1/bin/cmake -E remove -f 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift/macosx/x86_64/AVFoundation.swiftmodule
 && /usr/local/Cellar/cmake/3.9.1/bin/cmake -E remove -f 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift/macosx/x86_64/AVFoundation.swiftdoc
 && /usr/bin/python 
/Users/tonisuter/Projects/swift-source/swift/utils/line-directive 
@/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/SDK/AVFoundation/XuChu.txt
 -- 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./bin/swiftc
 -emit-module -o 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift/macosx/x86_64/AVFoundation.swiftmodule
 -sdk 
/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk
 -target x86_64-apple-macosx10.9 -resource-dir 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift
 -F 
/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/../../../Developer/Library/Frameworks
 -O -g -D INTERNAL_CHECKS_ENABLED -I 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./lib/swift/macosx/x86_64
 -module-cache-path 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/./module-cache
 -no-link-objc-runtime -swift-version 3 -autolink-force-load 
-warn-swift3-objc-inference-complete -Xfrontend -sil-serialize-witness-tables 
-Fsystem 
/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/PrivateFrameworks/
 -module-link-name swiftAVFoundation -force-single-frontend-invocation 
-parse-as-library 
@/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/SDK/AVFoundation/XuChu.txt
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "Headers/AVFoundation.h"
        ^
/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks/AVFoundation.framework/Headers/AVFoundation.h:88:9:
 error: 'AVFoundation/AVRouteDetector.h' file not found
#import <AVFoundation/AVRouteDetector.h>
        ^
/Users/tonisuter/Projects/swift-source/swift/stdlib/public/SDK/AVFoundation/AVCaptureDevice.swift:13:19:
 error: could not build Objective-C module 'AVFoundation'
@_exported import AVFoundation // Clang module
                  ^
[9/417] Compiling 
/Users/tonisuter/Projects/swift-source/build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/SDK/SceneKit/macosx/x86_64/SceneKit.o
ninja: build stopped: subcommand failed.
utils/build-script: fatal error: command terminated with a non-zero exit status 
1, aborting


Thanks and best regards

Toni
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