I have a target that contains Objective-C source files and builds a static
library for iOS. It works fine. I just tried adding a single Swift file to it,
and now it fails to build, with a strange link-time error:
libtool: unknown option character `X' in: -Xlinker
which sounds like Xcode is using a command-line flag that libtool doesn’t
understand. A bug in Xcode, maybe? (I’m using the latest beta of 6.3: 6D554n.)
If I remove the .swift file from the target, it builds file. Re-add it, I get
the error. I’ve checked the target build settings and there’s no custom
“-Xlinker” flag defined, so this must be something Xcode came up with on its
own.
Here’s the entire command line generated by Xcode, and the entire error message:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
-static -arch_only x86_64 -syslibroot
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.3.sdk
-L/Couchbase/Seekrit/build/Seekrit/Build/Products/Debug-iphonesimulator
-filelist
/Couchbase/Seekrit/build/Seekrit/Build/Intermediates/Seekrit.build/Debug-iphonesimulator/SeekritIOS.build/Objects-normal/x86_64/SeekritIOS.LinkFileList
-L/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator
-Xlinker -add_ast_path -Xlinker
/Couchbase/Seekrit/build/Seekrit/Build/Intermediates/Seekrit.build/Debug-iphonesimulator/SeekritIOS.build/Objects-normal/x86_64/SeekritIOS.swiftmodule
-o
/Couchbase/Seekrit/build/Seekrit/Build/Products/Debug-iphonesimulator/libSeekritIOS.a
error:
/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool:
unknown option character `X' in: -Xlinker
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