闲话 Scala Native: 初次见面，请多多关照

[sadhen]

首先用 scala-native 的 g8 模板创建一个脚手架：

$ sbt new scala-native/scala-native.g8
...
A minimal project that uses Scala Native. 

name [Scala Native Seed Project]: scala-native-playground

Template applied in /path/to/scala-native-playground

只要输入你想创建的工程的名字，整个脚手架就搭建起来了。

我们试着编译运行一下这个脚手架：

$ cd scala-native-playground
$ sbt
sbt:scala-native-playground> compile
[info] Non-compiled module 'compiler-bridge_2.11' for Scala 2.11.12. Compiling...
[info]   Compilation completed in 6.179s.
[info] Done compiling.
[success] Total time: 177 s, completed 2019-2-24 10:24:54
sbt:scala-native-playground> run
[error] no clang60, clang-6.0, clang50, clang-5.0, clang40, clang-4.0, clang39, clang-3.9, clang38, clang-3.8, clang37, clang-3.7, clang found in $PATH. Install clang ( http://www.scala-native.org/en/latest/user/setup.html)
[error] no clang++60, clang++-6.0, clang++50, clang++-5.0, clang++40, clang++-4.0, clang++39, clang++-3.9, clang++38, clang++-3.8, clang++37, clang++-3.7, clang++ found in $PATH. Install clang ( http://www.scala-native.org/en/latest/user/setup.html)
[error] (nativeClang) no clang60, clang-6.0, clang50, clang-5.0, clang40, clang-4.0, clang39, clang-3.9, clang38, clang-3.8, clang37, clang-3.7, clang found in $PATH. Install clang ( http://www.scala-native.org/en/latest/user/setup.html)
[error] (nativeClangPP) no clang++60, clang++-6.0, clang++50, clang++-5.0, clang++40, clang++-4.0, clang++39, clang++-3.9, clang++38, clang++-3.8, clang++37, clang++-3.7, clang++ found in $PATH. Install clang ( http://www.scala-native.org/en/latest/user/setup.html)
[error] Total time: 0 s, completed 2019-2-24 10:26:01

能正常编译，但是运行的时候会报错。按照提示，我们需要安装一些依赖：

$ sudo apt install clang libunwind-dev

然后，在重新在 sbt 的 REPL 里面敲 Run 就可以了。大概是这样：

sbt:scala-native-playground> run
[info] Linking (534 ms)
[info] Discovered 800 classes and 4709 methods
[info] Optimizing (debug mode) (742 ms)
[info] Generating intermediate code (242 ms)
[info] Produced 39 files
[info] Compiling to native code (332 ms)
[info] Linking native code (immix gc) (60 ms)
Hello, world!
[success] Total time: 3 s, completed 2019-2-24 10:27:45

整个过程还是比较流畅的，没有遇到特别浪费时间的事情，by the way，我所用的 Scala Native 版本是 0.3.8，这一点从project/plugins.sbt可以知道。

$ cat project/plugins.sbt                                                                                                    
addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.3.8")

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[sadhen]

主要是为了演示一下，试用 Scala Native 是多么简单。