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...)
