1进胯、Multiple commands produce
error: Multiple commands produce
'/Users/galahad/Library/Developer/Xcode/DerivedData/xxxxx-drnrntneloepunakcqbcdycudqeh/Build/Products/Debug-iphoneos/xxxxx.app':
1）Target 'xxxxx' has create directory command with output
'/Users/galahad/Library/Developer/Xcode/DerivedData/xxxxx-drnrntneloepunakcqbcdycudqeh/Build/Products/Debug-iphoneos/xxxxx.app'
2）That command depends on command in Target 'xxxxx': script phase “[CP] Copy Pods Resources”
錯誤原因：
Xcode 10 默認(rèn)使用的Build System是New Build System，與Xcode9不同原押。
解決方法：
1）方法一：移除Target -> Build phase -> Copy Pods Resources -> Output Files ->{TARGET_BUILD_DIR}/{UNLOCALIZED_RESOURCES_FOLDER_PATH} 胁镐。這個方法解決不徹底，重新pod install后，這個path會重新出現(xiàn)盯漂，需要重新刪除颇玷。
2）方法二：修改Build System。通過Xcode菜單欄 -> File -> Workspace Setting就缆，將Build System修改為Legacy Build System帖渠。
2、Jenkins打包時提示Multiple commands produce...违崇，但真機測試沒問題
錯誤原因：
Jenkins打包時默認(rèn)使用的是New build system阿弃，而不管你Xcode里是如何設(shè)置的诊霹。
解決方法：
archive時添加xcodebuild指令-UseModernBuildSystem=NO羞延，指定不使用當(dāng)前的編譯系統(tǒng)。參考：How can I use the legacy build system with Xcode 10's xcodebuild脾还？
3伴箩、 library not found for -lstdc++.6.0.9
ld: library not found for -lstdc++.6.0.9
clang: error: linker command failed with exit code 1 (use -v to see invocation)
錯誤原因：
Xcode10中已去除這個library。項目中有用到的話鄙漏，可以從舊版本Xcode中copy一份過來嗤谚。
解決方法：
從舊版本Xcode的library復(fù)制一份libstdc++.6.0.9.tbd，放到Xcode10對應(yīng)目錄下怔蚌。
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib（真機）
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib（模擬器）
4巩步、Cycle inside xxxxx; build could produce unreliable results
Cycle inside xxxxx; build could produce unreliable results.
This can usually be resolved by moving the app extension embedding build phase to the end of the list.
Cycle details:xxxxx
解決方法：
根據(jù)提示，在Target ->Build Phases下桦踊，把Embed APP Extensions移動到列表末尾椅野，問題解決。
5籍胯、訊飛語音識別SDK報錯
Undefined symbols for architecture arm64:
"_OBJC_CLASS$CNContactStore", referenced from:
objc-class-ref in iflyMSC(IFlyContact.o)
"_OBJC_CLASS$_CNContactFetchRequest", referenced from:
objc-class-ref in iflyMSC(IFlyContact.o)
"_CNContactGivenNameKey", referenced from:
-[IFlyContact fetchContactWithContactStore:] in iflyMSC(IFlyContact.o)
"_CNContactFamilyNameKey", referenced from:
-[IFlyContact fetchContactWithContactStore:] in iflyMSC(IFlyContact.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
錯誤原因：
找不到與Contact相關(guān)的key竟闪。
解決方法：
添加Contacts.framework。
