Carthage "workaround"

which doesn't quite work for me

.github/workflows/carthage.yml

@@ -8,4 +8,4 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Build
-      run: carthage build --no-skip-current --verbose
+      run: ./carthage.sh build --no-skip-current --verbose

README.md

@@ -24,7 +24,7 @@ Cross-platform QRCode generator written in pure Swift, aiming to solve the awkwa
 More details in the [Official Guide](https://developer.apple.com/documentation/xcode/adding_package_dependencies_to_your_app),
 but in general:
 
-1. Select in the menu bar of Xcode: `File` > `Swift Packages` > `Add Package Dependency`. 
+1. Select in the menu bar of Xcode: `File` > `Swift Packages` > `Add Package Dependency`
 2. Enter https://github.com/ApolloZhu/swift_qrcodejs.git
 2. Next, specify the version resolving rule as "Up to Next Major"
 3. Finish with choosing `QRCodeSwift` library and add it to your app target.
@@ -58,12 +58,15 @@ pod 'swift_qrcodejs', '~> 2.2.2'
 <details>
 <summary><strong>Carthage</strong></summary>
 
-I assume you know what you are doing because I don't, but you probably need something like this:
+I assume you know what you are doing (because I don't), but you probably need something like this:
 
 ```ruby
 github "ApolloZhu/swift_qrcodejs" ~> 2.2.2
 ```
 
+Note that [Carthage doesn't work with Xcode 12](https://github.com/Carthage/Carthage/issues/3019)
+(but here's a [workaround](https://github.com/Carthage/Carthage/blob/master/Documentation/Xcode12Workaround.md)).
+
 </details>
 
 <details>

carthage.sh

@@ -0,0 +1,20 @@
+# carthage.sh
+# Usage example: ./carthage.sh build --platform iOS
+# Why? https://github.com/Carthage/Carthage/blob/master/Documentation/Xcode12Workaround.md
+
+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.
+
+CURRENT_XCODE_VERSION=$(xcodebuild -version | grep "Build version" | cut -d' ' -f3)
+echo "EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200__BUILD_$CURRENT_XCODE_VERSION = 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 "$@"

swift_qrcodejs.xcodeproj/project.pbxproj

@@ -318,8 +318,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ENABLE_TESTABILITY = YES;
-				EXCLUDED_ARCHS = "$(inherited) $(EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_$(EFFECTIVE_PLATFORM_SUFFIX)__NATIVE_ARCH_64_BIT_$(NATIVE_ARCH_64_BIT)__XCODE_$(XCODE_VERSION_MAJOR))";
-				EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200 = "arm64 arm64e armv7 armv7s armv6 armv8";
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PLATFORM_DIR)/Developer/Library/Frameworks",
@@ -348,8 +346,6 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ENABLE_TESTABILITY = YES;
-				EXCLUDED_ARCHS = "$(inherited) $(EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_$(EFFECTIVE_PLATFORM_SUFFIX)__NATIVE_ARCH_64_BIT_$(NATIVE_ARCH_64_BIT)__XCODE_$(XCODE_VERSION_MAJOR))";
-				EXCLUDED_ARCHS__EFFECTIVE_PLATFORM_SUFFIX_simulator__NATIVE_ARCH_64_BIT_x86_64__XCODE_1200 = "arm64 arm64e armv7 armv7s armv6 armv8";
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
 					"$(PLATFORM_DIR)/Developer/Library/Frameworks",