SDK "iphoneos" cannot be located

在MAC下，交叉编译libvlc出现的一些问题和解决方法。
项目中使用了libvlc开源库。
在执行编译脚本中，遇到一句xcrun --sdk iphoneos --show-sdk-path报错

mac$ xcrun --sdk iphoneos --show-sdk-path

xcrun: error: SDK "iphoneos" cannot be located

查找原因：

mac$ xcode-select --print-path

/Library/Developer/CommandLineTools

发现是这个Xcode路径判断错误。

mac$ xcodebuild -showsdks

xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

回想起最近安装了另外两个版本的Xcode，应该是这样导致了路径错误。

mac$ ls /Applications/Xcode

Xcode.app/ Xcode2.app/ Xcode3.app/

解决方法：给Xcode命令行工具指定路径

mac$ sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer/

再回头查看

mac$ xcrun --sdk iphoneos --show-sdk-path

-- ::06.359 xcodebuild[:] [MT] DVTSDK: Warning: SDK path collision for path '<DVTFilePath:0x7f8012844eb0:'/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8..sdk'>': SDK with name 'iphoneos8.1' being superceded by SDK with 'iphoneos8.1'.

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8..sdk

mac$ xcodebuild -showsdks

-- ::26.543 xcodebuild[:] [MT] DVTSDK: Warning: SDK path collision for path '<DVTFilePath:0x7f8cd15e4f50:'/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8..sdk'>': SDK with name 'iphoneos8.1' being superceded by SDK with 'iphoneos8.1'.

OS X SDKs:

OS X 10.9 -sdk macosx10.

OS X 10.10 -sdk macosx10.

iOS SDKs:

iOS 8.1 -sdk iphoneos8.

iOS Simulator SDKs:

Simulator - iOS 8.1 -sdk iphonesimulator8.

参考 http://www.ithao123.cn/content-10811313.html 特此感谢
目前编译libvlc的MAX机其他软件环境如下

mac$ sw_vers

ProductName:    Mac OS X

ProductVersion:    10.10.

BuildVersion:    14F27

mac$ uname -a

Darwin xxx.local 14.5. Darwin Kernel Version 14.5.: Wed Jul  :: PDT ; root:xnu-2782.40.~/RELEASE_X86_64 x86_64

巴特西

SDK "iphoneos" cannot be located

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