此处介绍，和crosstool-ng，为了交叉编译，作为工具本身方面的一些常见的，重要的参数的配置。
常见配置如下：
Paths and misc options
(${HOME}/develop/crosstool-ng/src) Local tarballs directory
Local tarballs directory的help的说明为：
┌───────────────────────── Local tarballs directory ──────────────────────────┐
│ CT_LOCAL_TARBALLS_DIR: │
│ │
│ If you have previously downloaded the tarballs, enter the PATH where │
│ you stored them here. │
│ │
│ Symbol: LOCAL_TARBALLS_DIR [=${HOME}/develop/crosstool-ng/src] │
│ Type : string │
│ Prompt: Local tarballs directory │
│ Defined at config/global/paths.in:5 │
│ Depends on: !BACKEND [=n] │
│ Location: │
│ -> Paths and misc options │
即，你之前配置好的各种模块，包括C库，GCC，binutils等等所有的东西，下载下来，都放在此文件夹中。
对应的路径配置，可以参考前面介绍的：
所有的东西，都放在其下，包括：
- 编译时所生成的arm-xscale-linux-gnueabi文件夹
- 所有模块解压的源码在其下的src路径下
一般使用默认配置，如下：
Paths and misc options
(${CT_TOP_DIR}/.build) Working directory
Working directory的help的说明为：
┌───────────────────────────── Working directory ─────────────────────────────┐
│ CT_WORK_DIR: │
│ │
│ Set this to the directory where all build actions will be done. │
│ │
│ The default is "${CT_TOP_DIR}/.build", and leaving this option │
│ empty will also use the default. │
│ │
│ You should not need to change that, except in one very peculiar │
│ setup: │
│ - your crosstool-NG source directory is on the network │
│ - you configured crosstool-NG with --local │
│ This kind of setup is a pain, as any action involving source file │
│ access would have to go through the wire. In this case, you should │
│ set CT_WORK_DIR to point to a path local to your machine, to avoid │
│ any network overhead. │
│ │
│ Do *NOT* change it if you don't know better. │
│ │
│ Symbol: WORK_DIR [=${CT_TOP_DIR}/.build] │
│ Type : string │
│ Prompt: Working directory │
│ Defined at config/global/paths.in:31 │
│ Depends on: !BACKEND [=n] │
│ Location: │
│ -> Paths and misc options │
改为你自己的，对应的x-tools/${CT_TARGET}的路径：
Paths and misc options
(${HOME}/develop/crosstool-ng/x-tools/${CT_TARGET}) Prefix directory
Prefix directory的help的说明为：
┌────────────────────────────── Prefix directory ──────────────────────────────┐
│ CT_PREFIX_DIR: │
│ │
│ This is the path the toolchain will run from. │
│ │
│ Symbol: PREFIX_DIR [=${HOME}/develop/crosstool-ng/x-tools/${CT_TARGET}] │
│ Type : string │
│ Prompt: Prefix directory │
│ Defined at config/global/paths.in:52 │
│ Depends on: !BACKEND [=n] │
│ Location: │
│ -> Paths and misc options │
此处对应的x-tools路径，可参考之前的解释：
 |  |  |
| 3.3.2. crosstool-ng核心配置详解 |  | 3.3.2.2. 交叉编译相关的核心参数 |
