导读： 随着 iOS14 和 Xcode12 的更新到来，又一波的升级适配需要搞起来了，昨天开始着手升级了一下 Xcode12，但是发现原本使用 Carthage 配置的第三方库管理，编译出现了失败：
Module compiled with Swift 5.2.4 cannot be imported by the Swift 5.3 compiler:/Users/mxgx/Documents/GitHub/MyGitHub/JJCAppStoreProjects/JJCComicBook/JJCComicBook/Carthage/Build/iOS/SnapKit.framework/Modules/SnapKit.swiftmodule/x86_64-apple-ios-simulator.swiftmodule
初次问题解决
最开始认为是因为升级 Xcode12，导致了编译的 Swift 版本由 Swift 5.2.4 升级为 Swift 5.3 引起的；所以就删除了 Carthage 编译的 framework 库文件，尝试重新编译，但是发现又再次出现了其他的问题：
*** Building scheme "Alamofire iOS" in Alamofire.xcworkspace
Build Failed
Task failed with exit code 1:
/usr/bin/xcrun lipo -create /Users/mxgx/Library/Caches/org.carthage.CarthageKit/DerivedData/12.0_12A7209/Alamofire/5.0.5/Build/Intermediates.noindex/ArchiveIntermediates/Alamofire\ iOS/IntermediateBuildFilesPath/UninstalledProducts/iphoneos/Alamofire.framework/Alamofire /Users/mxgx/Library/Caches/org.carthage.CarthageKit/DerivedData/12.0_12A7209/Alamofire/5.0.5/Build/Products/Release-iphonesimulator/Alamofire.framework/Alamofire -output /Users/mxgx/Documents/GitHub/MyGitHub/JJCAppStoreProjects/JJCComicBook/JJCComicBook/Carthage/Build/iOS/Alamofire.framework/Alamofire
This usually indicates that project itself failed to compile. Please check the xcodebuild log for more details: /var/folders/kt/pbq7yrws4xz_kspt99zyc9lc0000gn/T/carthage-xcodebuild.kLdrkn.log
根据报错的信息，只能看出大概是编译配置出问题了，尝试看一下 log 日志文件：
/var/folders/kt/pbq7yrws4xz_kspt99zyc9lc0000gn/T/carthage-xcodebuild.kLdrkn.log
但是发现完全看不懂。
再次尝试
因为看到报错信息里有涉及到 Caches 的字样，担心是因为缓存问题影响了升级的配置，所以就尝试了删除以下目录下的文件：
// 目录1：DerivedData 子文件夹
/Users/mxgx/Library/Caches/org.carthage.CarthageKit/DerivedData/
// 目录2：项目根目录下 Carthage 文件夹和 Cartfile.resolved 文件
/Users/mxgx/Documents/GitHub/MyGitHub/JJCAppStoreProjects/JJCComicBook/JJCComicBook/
// 目录3：Xcode 的 Derived Data 编译缓存文件
/Users/mxgx/Library/Developer/Xcode/DerivedData/
当清除完后，再次使用命令进行更新编译：
carthage update --platform ios
但是最终发现仍是有同样的问题。
最后解决
最后再技术群里咨询了一位大佬，给了个解决的方案：
Carthage builds fail at xcrun lipo on Xcode 12 beta (3,4,5…) #3019
脚本如下：
#!/usr/bin/env bash
# carthage-build.sh
# Usage example: ./carthage-build.sh --platform iOS
# https://github.com/Carthage/Carthage/issues/3019
set -euo pipefail
xcconfig=$(mktemp /tmp/static.xcconfig.XXXXXX)
trap 'rm -f "$xcconfig"' INT TERM HUP EXIT
# For Xcode 12 make sure EXCLUDED_ARCHS is set to arm architectures otherwise
# the build will fail on lipo due to duplicate architectures.
# Xcode 12 Beta 3:
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A8169g = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
# Xcode 12 beta 4
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A8179i = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
# Xcode 12 beta 5
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A8189h = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
# Xcode 12 beta 6
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A8189n = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
# Xcode 12 GM (12A7208)
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A7208 = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
# Xcode 12 GM (12A7209)
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_12A7209 = arm64 arm64e armv7 armv7s armv6 armv8' >> $xcconfig
echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200 = $(EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_$(XCODE_PRODUCT_BUILD_VERSION))' >> $xcconfig
echo 'EXCLUDED_ARCHS = $(inherited) $(EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_$(EFFECTIVE_PLATFORM_SUFFIX)__NATIVE_ARCH_64_BIT_$(NATIVE_ARCH_64_BIT)__XCODE_$(XCODE_VERSION_MAJOR))' >> $xcconfig
export XCODE_XCCONFIG_FILE="$xcconfig"
carthage build "$@"
当使用指令：(本人将 .sh 脚本放到了项目根目录中)
./carthage-build.sh --platform iOS
运行成功后，再次 Command + B 编译 Xcode12，发现一切正常了。
总结
而按照：
Carthage builds fail at xcrun lipo on Xcode 12 beta (3,4,5…) #3019
里面的各位大佬的问题反馈，应该是 AppleSilicon 上的 iPhoneSimulator 是 arch arm64，而 iPhoneSimulator 则与同一 arch arm64 上的 iPhoneOS 库有冲突，所以出现了这种问题。
在此记录一下，便于日常学习。
参考链接
版权声明
原文作者：苜蓿鬼仙（苜蓿、jijiucheng）
原文链接：GitHub.io - 苜蓿鬼仙 - 【iOS】升级 Xcode12 引起的 Carthage 配置变更问题
发表日期：2020/09/22 10:00:00
更新日期：2020/09/22 10:00:00
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文档信息
- 本文作者：苜蓿鬼仙
- 本文链接：https://jijiucheng.github.io/2020/09/22/Carthage-UpdateToXcode12/
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