Xcode11升级到Xcode12 遇到的问题

升级到Xcode12后报的错误如下：

• 如果是三方库比如友盟推送出现了以前的SDK1.3.0版本，而现在是2.5.2版本，则在Build Setting中Library Search Paths中删除1.3.0版本

• 重新选择New Build System，另一个弃用了

  
  

• 模拟器报错，报错代码如下

ld: in /Users/mac126/Desktop/项目名/Pods/BaiduMapKit/BaiduMapKit/BaiduMapAPI_Base.framework/BaiduMapAPI_Base(BMSDKKeychainItemWrapper.o), building for iOS Simulator, but linking in object file built for iOS, file '/Users/mac126/Desktop/项目名/Pods/BaiduMapKit/BaiduMapKit/BaiduMapAPI_Base.framework/BaiduMapAPI_Base' for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Xcode12 没有VALID_ARCHS，手动添加VALID_ARCHS，加一个x86_64

• 真机运行报以下错

新加一个arm64 即可真机运行

但是加上x86_64后模拟器能运行，真机报错，加上x86_64和arm64后，真机能运行，模拟器报错。

所以不支持模拟器arm64架构，要排除arm64架构，解决如下：

Build Settings -> Excluded Architectures

以上配置完，真机和模拟器都能运行

• ld: library not found for -lstdc++.6.0.9
  手动加入

将文件夹的内容拷贝到对应路径下即可

平台           文件夹              文件                大小                        路径
模拟器运行   CoreSimulator   libstdc++.6.0.9.dylib   766,624B        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/

模拟器编译   iPhoneSimulator libstdc++.6.0.9.tbd     206,800B        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/

iOS真机       iPhoneOS       libstdc++.6.0.9.tbd    209,673B        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/

macAPP        MacOSX         libstdc++.6.0.9.tbd    206,751B        /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib/

模拟器运行和编译我把三个文件（libstdc++.6，libstdc++.6.0.9，libstdc++）全部加入，真机只加入6.0.9

6.0.9文件下载地址

链接: https://pan.baidu.com/s/1oDTkWi7htRgLY84mDis73Q
密码: 0d5g

参考文章一

参考文章二