使用Carthage进行构建时如何选择Swift工具链 [英] How to select Swift toolchains when building with Carthage

问题描述

我正在创建一个iOS应用，并使用Carthage构建外部库.由于我目前使用的库都是Swift 2和Swift 3，所以我有点挤.因此，我想拥有一个Swift 2分支和一个Swift 3分支进行开发，然后在所有库都兼容Swift 3时合并它们.

I am creating an iOS app and use Carthage to build external libraries. Since the libraries I use are currently both Swift 2 and Swift 3 I am in a bit of a squeeze. Thus I want to have one Swift 2 branch and one Swift 3 branch for development and then merge them when the libraries are all Swift 3 compatible.

但是，我无法选择要使用Carthage(版本0.18)进行构建的工具链.

However, I am not able to select which toolchain for build for with Carthage (version 0.18).

这是我的Cartfile的内容:

Here is the contents of my Cartfile:

# Swift 2 libraries
github "stephencelis/SQLite.swift" ~> 0.10.1
github "Haneke/HanekeSwift"

# Swift 3 libraries
#github "stephencelis/SQLite.swift" "swift3"
#github "Haneke/HanekeSwift" "feature/swift-3"
#github "kitasuke/PagingMenuController"
#github "Alamofire/Alamofire" ~> 4.0

当前使用carthage update构建.这是一些输出，验证我当前正在使用Swift 2:

This currently builds by using carthage update. Here are some output verifying that I am currently using Swift 2:

$ swift --version
Apple Swift version 2.2 (swiftlang-703.0.18.8 clang-703.0.31)
Target: x86_64-apple-macosx10.9
$ ls -lh $(which swift)
-rwxr-xr-x  1 root  wheel    18K Jul  8 19:52 /usr/bin/swift

现在我想切换到使用Swift 3进行构建.我在/Library/Developer/Toolchains中安装了多个工具链，这是OSX在运行安装程序时在其中安装它们的地方:

Now I want to switch to build with Swift 3. I have multiple toolchains installed in /Library/Developer/Toolchains, which is where OSX installs them when I run the installer:

$ ls -lh /Library/Developer/Toolchains
drwxr-xr-x  6 root  wheel   204B Sep 30 20:07 swift-2.2.1-SNAPSHOT-2016-04-23-a.xctoolchain
drwxr-xr-x  7 root  wheel   238B Sep 30 17:41 swift-3.0-RELEASE.xctoolchain
drwxr-xr-x  7 root  wheel   238B Oct  6 20:53 swift-3.0.1-PREVIEW-2.xctoolchain
lrwxr-xr-x  1 root  wheel    30B Oct  8 12:51 swift-latest.xctoolchain -> swift-3.0-RELEASE.xctoolchain/

请注意，我同时安装了Xcode8和Xcode7:

Note that I have both Xcode8 and Xcode7 installed:

$ ls /Applications/Xcode*
/Applications/Xcode.app:
Contents
/Applications/Xcode8.app:
Contents
$ xcodebuild -version
Xcode 7.3.1
Build version 7D1014

现在，可以说我有以下情况:

Now, lets say I have the following scenario:

$ cat Cartfile
github "Alamofire/Alamofire" ~> 4.0
$ carthage update --toolchain com.apple.dt.toolchain.Swift_3_0
*** Fetching Alamofire
*** Checking out Alamofire at "4.0.1"
*** xcodebuild output can be found in /var/folders/wg/fjk346qs7mx8fhplf8_805wm0000gn/T/carthage-xcodebuild.zfHVn5.log
*** Building scheme "Alamofire iOS" in Alamofire.xcworkspace
warning: failed to load toolchain 'com.apple.dt.toolchain.Swift_3_0': Could not find toolchain: com.apple.dt.toolchain.Swift_3_0

我只是无法使它正常工作.所以我的问题是:

I just cannot get this to work. So my question is:

如何通过其他工具链使用迦太基进行构建?

这是我尝试过的:

1. 将swift-latest.xctoolchain的符号链接更改为其他内容.没有区别.

2. 像这样将工具链手动添加到我在.bashrc中的PATH变量中，但这没什么区别.

1. Changing the symbolic link of swift-latest.xctoolchain to other things. Does no difference.

2. Manually adding the toolchains to my PATH variable in .bashrc like this, but it makes no difference.

$ cat ~/.bashrc
export PATH="$PATH:/Library/Developer/Toolchains/swift-2.2.1-SNAPSHOT-2016-04-23-a.xctoolchain/usr/bin/"
export PATH="$PATH:/Library/Developer/Toolchains/swift-3.0-RELEASE.xctoolchain/usr/bin/"
export PATH="$PATH:/Library/Developer/Toolchains/swift-3.0.1-PREVIEW-2.xctoolchain/usr/bin/"

使用TOOLCHAINS=com.apple.dt.toolchain.Swift_3_0 carthage build和类似版本运行构建，但是没有区别(仍然找不到工具链).

Running the build with TOOLCHAINS=com.apple.dt.toolchain.Swift_3_0 carthage build and similar, but it makes no difference (still cannot find the toolchain).

推荐答案

从迦太基开始 0.17 有一个选项--toolchain，它允许您指定要用于构建的确切工具链ID.用法示例:

As of Carthage 0.17 there is an option --toolchain that allows one to specify an exact toolchain ID to use for the build. Example usage:

carthage update --toolchain org.swift.402017072a

工具链的ID来自工具链Info.plist文件中的键CFBundleIdentifier.

The ID of the toolchain comes from the key CFBundleIdentifier in Info.plist file of the toolchain.

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