升級Xcode 10 后報錯問題記錄（[CP] Copy Pods Resources）&& library not found for -libstdc++.6.0.9

1、升級Xcode到Version 10.0 (10A255)后，運行已有項目，報如下錯誤：

error: Multiple commands produce '/Users/galahad/Library/Developer/Xcode/DerivedData/yoowei-drnrntneloepunakcqbcdycudqeh/Build/Products/Debug-iphoneos/yoowei.app':

1) Target 'yoowei' has create directory command with output '/Users/galahad/Library/Developer/Xcode/DerivedData/yoowei-drnrntneloepunakcqbcdycudqeh/Build/Products/Debug-iphoneos/yoowei.app'

2) That command depends on command in Target 'yoowei': script phase “[CP] Copy Pods Resources”

 

原因：Xcode 10 默認使用的build system是New build system，與Xcode9不同導致。

解決：2種方法

1）第一種方法 不修改build system 

根據error 日志，script phase “[CP] Copy Pods Resources”，而且與output有關，應該是使用了cocoapods導致的，嘗試刪除該項目target-Copy Pods Resources-Output Files，成功解決問題。選中項目target -> Build phase -> Copy Pods Resources -> Output Files -> 移除${TARGET_BUILD_DIR}/${UNLOCALIZED_RESOURCES_FOLDER_PATH}  然后重新編譯，OK 。

用這種方式緊接着會有下面的錯誤：

error: Cycle in dependencies between targets 'yooweiExtension' and 'yoowei'; building could produce unreliable results.

Cycle path: yooweiExtension → yoowei → yooweiExtension

Cycle details:

→ Target 'yooweiExtension': CodeSign /Users/galahad/Library/Developer/Xcode/DerivedData/yoowei-drnrntneloepunakcqbcdycudqeh/Build/Products/Debug-iphoneos/yooweiExtension.appex

○ Target 'yooweiExtension': ProcessProductPackaging  /Users/galahad/Library/Developer/Xcode/DerivedData/yoowei-drnrntneloepunakcqbcdycudqeh/Build/Intermediates.noindex/yoowei.build/Debug-iphoneos/yooweiExtension.build/yooweiExtension.appex.xcent

○ Target 'yooweiExtension' has target dependency on Target 'yoowei'

→ Target 'yoowei' has target dependency on Target 'yooweiExtension'

○ That command depends on command in Target 'yooweiExtension': script phase “[CP] Check Pods Manifest.lock”

對應的解決方案：選中項目target -> Build phase -> Target Dependencies  去掉相互的依賴即可

 

2）第二種方法 修改build system 
在Xcode菜單欄 -> File -> Workspace Setting，將build system修改為legacy build system，然后clean后編譯。

2、典型問題

ld: library not found for -lstdc++.6.0.9

clang: error: linker command failed with exit code 1 (use -v to see invocation)

解決方案：（我一般升級xcode 之前都會將lib 給備份一份。具體路徑是：/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib ）

1、提前在xcode 9中 根據路徑   /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib 找到 libstdc++.6.0.9.tbd  備份

2、復制剛才的libstdc++.6.0.9.tbd 文件，手動添加到 升級后的xcode 10  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib 文件夾中，運行即可。

需要的話，可以找我要。注意分真機和模擬器環境：

1.真機環境：/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
2.模擬器環境：/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/ 

20190313遇到一種情況：編譯報錯     library not found for -l"stdc++.6.0.9" 

比較奇怪就是，我已經按照上面將libstdc++.6.0.9.tbd 手動添加過了。但是為什么還會報錯呢？

解決辦法：

打開Build Phases--Link Binary With Libraries，刪除6.0.9依賴   添加Libc++.tdb 即可。

如果依賴c++6.0.9的SDK是第三方SDK等待第三方更新解決。