Adds carthage-build.sh script for building binaries

Author: simonmitchell

README.md

@@ -59,6 +59,12 @@ class MyTableViewController: TableViewController {
 }
 ```
 
+# Building Binaries for Carthage
+
+Since Xcode 12 there has been issues with building Carthage binaries caused by the inclusion of a secondary arm64 slice in the generated binary needed for Apple Silicon on macOS. This means that rather than simply using `carthage build --archive` you need to use the `./carthage-build build --archive` command which uses the script included with this repo. For more information, see the issue on Carthage's github [here](https://github.com/Carthage/Carthage/issues/3019)
+
+We will be investigating moving over to use SPM as an agency soon, and will also look into migrating to use .xcframeworks as soon as Carthage have support for it.
+
 # Code level documentation
 Documentation is available for the entire library in AppleDoc format. This is available in the framework itself or in the [Hosted Version](http://3sidedcube.github.io/iOS-ThunderTable/)
 

carthage-build.sh

@@ -0,0 +1,29 @@
+# carthage-build.sh
+# Usage example: ./carthage-build.sh --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.
+# 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
+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 2
+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
+echo 'ONLY_ACTIVE_ARCH=NO' >> $xcconfig
+echo 'VALID_ARCHS = $(inherited) x86_64' >> $xcconfig
+export XCODE_XCCONFIG_FILE="$xcconfig"
+echo $XCODE_XCCONFIG_FILE
+carthage "$@"