Fix Carthage integration

[giginet]

Motivation

I'd like to use this library with Carthage, However, some settings are broken, so we can't build this with Carthage.

There are two problems.

• We can't use this library with Carthage regularly
• We can't use this library with Carthage in XCFramework

Minimum situation

Xcode 12.4

Cartfile (of an application project)

github "RxSwiftCommunity/RxSwiftExt" "7cae93b7795fb7b4ecf617aec5f1c0f1fc8fb0e6" # current main HEAD

Carthage build command

$ carthage bootstrap --platform ios --use-xcframeworks --cache-builds
*** Building scheme "RxSwiftExt-iOS" in RxSwiftExt.xcworkspace
Build Failed
        Task failed with exit code 65:
        /usr/bin/xcrun xcodebuild -workspace /Users/giginet/work/CarthagePlayground/Carthage/Checkouts/RxSwiftExt/RxSwiftExt.xcworkspace -scheme RxSwiftExt-iOS -configuration Release -derivedDataPath /Users/giginet/Library/Caches/org.carthage.CarthageKit/DerivedData/12.4_12D4e/RxSwiftExt/6.0.0 -sdk iphoneos ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES archive VALIDATE_WORKSPACE=NO -archivePath /var/folders/b_/_ndwwrsd68q8yskc_sbtlbk80000gn/T/RxSwiftExt SKIP_INSTALL=YES GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=NO CLANG_ENABLE_CODE_COVERAGE=NO STRIP_INSTALLED_PRODUCT=NO (launched in /Users/giginet/work/CarthagePlayground/Carthage/Checkouts/RxSwiftExt)

Description

I fixed some errors to integrate this library with Carthage.

1. Cartfile syntax was broken
2. Change minimum development target version to 9.0
   • Package.swift requires 9.0. However, xcodeproj's one was wrong.
3. Add Rx.xcodeproj to xcodeproj to solve dependencies

Fixes 3 will solve the issue which it can't build this library as XCFramework with Carthage. Current xcodeproj searchesRxSwift.framework in Carthage/Build/iOS. However, when it was built with --use-xcframework options, RxSwift.xcframework is generated instead. So the project can't find dependencies. I added Rx.xcodeproj into the xcodeproj as a child project. It will solve this problem.

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[giginet]

It works for me. @freak4pc Could you release a newer version?

$ carthage update --platform ios --use-xcframeworks --cache-builds RxSwiftExt
*** Fetching RxSwiftExt
*** Fetching RxSwift
*** Checking out RxSwiftExt at "a42af9caeab63f2dbde318f1f3dc424f05871a37"
*** Checking out RxSwift at "6.1.0"
*** Valid cache found for RxSwift, skipping build
*** Invalid cache found for RxSwiftExt, rebuilding with all downstream dependencies
*** Building scheme "RxSwiftExt-iOS" in RxSwiftExt.xcworkspace