This usually indicates that project itself failed to compile.

Xcode 12，carthage update 报错

eg：

This usually indicates that project itself failed to compile. Please check the xcodebuild log for more details: /var/folders/vp/nr24phw118vcczpjgwy3jt680000gp/T/carthage-xcodebuild.723t8z.log

解决方法：

1、在当前工程根目录下，创建个 carthage.sh

vi  carthage.sh    //创建个 .sh 脚本文件

2、脚本内容

#!/usr/bin/env bash  

# carthage.sh

# Usage example: ./carthage.sh build --platform iOS

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.

echo 'EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200 = arm64 arm64e armv7 armv7s armv6 armv8' >> $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 "$@"

3、使脚本可执行，修改脚本权限

 chmod +x carthage.sh

4、用 ./carthage.sh + ***       替代 carthage + *** 

eg：

./carthage.sh build        

./carthage.sh update --use-submodules

链接地址

Carthage builds fail at xcrun lipo on Xcode 12 beta (3,4,5...)