fix(Carthage): fix Carthage build and archiving

Carthage is broken with Xcode 12. A temporary script has been added that adds a workaround to the issue. The script can be removed and the default Fastlane action can be used when a new Carthage version has been released with a fix.

Carthage/Carthage#3019

carthage.sh

@@ -0,0 +1,17 @@
+#!/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 "$@"

fastlane/Fastfile

@@ -80,18 +80,30 @@ platform :ios do
 
   desc "Lint Carthage lib"
   lane :carthage_lint do
-    carthage(
-      command: "update",
-      platform: "iOS",
-      cache_builds: true,
-    )
 
-    carthage(
-      command: "build",
-      platform: "iOS",
-      cache_builds: true,
-      no_skip_current: true,
-    )
+    # This is a temporary fix while Carthage is broken with Xcode 12
+    # https://github.com/Carthage/Carthage/issues/3019#issuecomment-665136323
+    #
+    # The default Fastlane action can be used when a new Carthage version with a fix has been released
+    # and the ./carthage.sh script can be removed
+    Dir.chdir("..") do
+      sh("./carthage.sh", "update", "--platform", "iOS", "--cache-builds")
+
+      sh("./carthage.sh", "build", "--no-skip-current", "--platform", "iOS", "--cache-builds")
+    end
+
+    # carthage(
+    #   command: "update",
+    #   platform: "iOS",
+    #   cache_builds: true,
+    # )
+
+    # carthage(
+    #   command: "build",
+    #   platform: "iOS",
+    #   cache_builds: true,
+    #   no_skip_current: true,
+    # )
   end
 
   desc "Deploy a new version to Github and Cocoapods"
@@ -108,9 +120,18 @@ platform :ios do
       UI.user_error! "Podspec version different than tag name"
     end
 
-    carthage(
-      command: "archive",
-    )
+    # This is a temporary fix while Carthage is broken with Xcode 12
+    # https://github.com/Carthage/Carthage/issues/3019#issuecomment-665136323
+    #
+    # The default Fastlane action can be used when a new Carthage version with a fix has been released
+    # and the ./carthage.sh script can be removed
+    Dir.chdir("..") do
+      sh("./carthage.sh", "archive")
+    end
+
+    # carthage(
+    #   command: "archive",
+    # )
 
     pod_push(
       path: "ReCaptcha.podspec",