自从买了 iPhone 4，我一直在琢磨着怎么怎么把它变得跟一台开发用的电脑一样，比如像装了开发环境（Homebrew）的 Mac MINI 一样。从 Apple Store 上买了一根 iPhone/iPad to VGA 适配电缆之后，我的 iPhone 可以输出到电视和显示器。在 jailbreak 工具（redsn0w）和 Cydia 的帮助下，我可以把 iPhone 和无线键盘、无限鼠标连接起来。我还安装了 iPhone 上的 Mobile Terminal  和一些常用的工具程序，包括和 awk 和 vim。随后，感谢牛鼻的黑客们提供了 GCC 4.2 和 Google Go compiler 的 iPhone 版本。然后呢，用 iPhone 写程序大概就是这个样子的（我其实可以把 iPhone 横过来，这样更能充分利用电视宽屏的空间；图中配角男还应该减减肥）：

在 iPhone 上用 vim 编辑 C 语言和 Go 语言程序的样子如下：

呵呵呵呵

编译和运行程序的样子是这样的：

呵呵呵呵

附上一些秘笈：

• Cydia 里默认的 Mobile Terminal 版本低，在 iOS 5 上会crash。安装 up-to-date 的 Mobile Terminal：http://iphonejailbreaks.org/mobile-terminal-crashes-on-ios-4-3-1-here-is-the-solution/
• 在手机上用 Mobile Terminal，如果没有无限键盘，敲键太慢。通常是通过电脑 ssh 到 iPhone 的：http://www.cultofmac.com/32134/access-your-iphone-file-system-with-ssh-jailbreak-superguide/
• 在 Apple Store 上购买 iPhone/iPad 的 VGA 转接电缆：http://store.apple.com/us/product/MC552ZM/B
• 在 Cydia 上安装一个叫 DisplayOut 的软件，把 iPhone 屏幕上的内容通过电缆输出到电视或者显示器上。如果没有安装这个软件，只有部分 iPhone 程序能输出到 VGA。
• 在 Cydia 上安装一个叫 BT Keyboard 的程序让 iPhone 可以连接无线键盘
• 在 Cydia 上安装一个叫 BT Mouse 的程序让 iPhone 可以连接无线鼠标
• 在 iPhone 上安装 GCC 4.2：http://cxwangyi.wordpress.com/2012/01/28/how-to-install-gcc-4-2-on-iphone/
• 在 iPhone 上用 GCC build Google Go 语言的编译器：http://cxwangyi.wordpress.com/2012/01/28/learning-go-go-for-iphoneipad/

Make.inc:79: *** Invalid $GOOS ‘darwin’ for GOARCH=arm; must be linux. Stop.
Did not find Go environment variables.

Then I searched “go darwin arm” in go-nuts group, the result leads me to a very new (Jan 7, 2012) and exciting work — a darwin/arm port of Go.

However, I also noticed a claim by the Go authors at the bottom of the discussion thread:

Date: Sat, 21 Jan 2012 15:48:18 -0500
Subject: Re: [golang-dev] Re: Darwin/ARM (aka. iOS) port of Go is READY
From: Russ Cox
To: minux
Cc: golang-dev@googlegroups.com

Sorry, I meant to reply about this before. We have decided
not to include the darwin/arm code in the main tree until there
is a way to run it on an ordinary iDevice without any kind of
“jailbreaking”. If the port advances to that point, please let
us know, but until then I’m afraid you’ll need to maintain your
own copy.

What a pitty for the official Go community~~ But so what! My best appreciation to minux, the author of the Darwin/ARM port of Go.

Here copy-and-pastes the content of the post mentioned above:

———————————————-

Here is what you need to do in order to be able to compile and run a C application on iphone:

1. You will need to Jailbreak the iPhone first, search on google for more info.
2. Install OpenSSH from Cydia.
3. Connect iPhone to your wireless network and SSH to it.
4. Download this application using: wget http://www.syshalt.net/pub/iphone/gcc-iphone/fake-libgcc_1.0_iphoneos-arm.deb
5. Install libcc using: dpkg –i fake-libgcc_1.0_iphoneos-arm.deb
6. Install iphone-gcc using this command: apt-get install iphone-gcc
(you can download this version from my website: iphone-gcc if does not work on your device the one that is installed by default)
7. Download using: wget http://www.syshalt.net/iphone/gcc-iphone/sdk-2.0-headers.tar.gz
8. Untar with command: tar -xvzf sdk-2.0-headers.tar.gz
9. Enter in the new created folder with: cd include-2.0-sdk-ready-for-iphone
10. Copy all files to include folder with command: cp –r * /usr/include
11. Now type: cd .. in order to return to the previous folder
12. Download using: wget http://www.syshalt.net/iphone/gcc-iphone/gcc_files.tar.gz
13. Untar with command: tar -xvzf gcc_files.tar.gz
14. Enter in the new created folder with command: cd gcc_files
15. Copy all files to /usr/lib using command: cp –r * /usr/lib
16. Install ldid to sign the application (this will prevent iOS to kill the application at startup) using: apt-get install ldid
17. Sign your compilet aplication using: ldid –S <application>
18. Run the application using: ./<application>

Suggestion: Install using: apt-get install nano
This will help you code easy directly from terminal.

Here is an example of hello world using C and gcc to compile on iPhone iOS 4:

I used nano hello.c in terminal to open a new files and writed this simple application:

#include <stdio.h>
int main() {
printf(“hello, world\n”);
return 0;
}

and then CTRL+X to save it, then I typed: gcc –o hello hello.c and after that ldid –S hello
Now you can run your application using ./hello

However, the Clang installed by Homebrew on my Mac OS X 10.7 (Lion) is based on LLVM 3.0 and works well with google-test.

The homepage of LLVM listed pre-built Clang and LLVM 3.0 for Ubuntu 11.04 and 11.10. So I guess I would have to upgrade to at least Ubuntu 11.04.

FreeBSD 9.0 comes with Clang based on LLVM 3.0.

So I used two magic options: clang -v -E, which outputs details about how it tries to find the header files. This reveals that clang finds in /usr/local/c++/4.4.x, but not including /usr/local/c++/4.5.1, which is my only version installed together with GCC 4.5.1.

So, my solution is simply sudo apt-get install g++-4.4. (Note that is not enough to install gcc-4.4, because that does not bring you C++ header files and libraries.)

除了这篇论文，我注意到这篇blog：Design patterns in Go programming language 里，作者介绍了如何用 Go 实现另外三种 design patterns：command, strategy 和 factory。

在我的这篇幻灯片里，我本来试图从 design patterns 如何用 Go 实现的角度来介绍 Go 语言。但是因为总结的不够，所以没有这么写。希望接下来能总结一下如何使用 Go 语言。

当然，纯粹的考虑一种语言如何实现一种 pattern 是机械的。一种观点是：如果需要一种 pattern，则说明使用的语言缺乏对应的语法。比如，这篇题为 The (lack of) design patterns in Python 幻灯片里，作者 Joe Gregorio 展示了一些用 Java 和 C++ 需要专门描述的 designs，如果用 Python，则只需少数几行，以至于没必要总结成一种 pattern。

在我的这篇博文里，列了 Peter Novig 的一个幻灯片，其中说 23 种常见 design patterns 中的 16 种，在 Lisp 语言种都有语法可以支持。