crosstool-ng详解

5.2.1. 不论何种平台下编译crosstool-ng常见错误及解决办法

此法，也是我之前，在Cygwin中折腾crosstool-ng时，去尝试过的：

【已解决】Cygwin下配置Linux内核出错：Makefile:419: *** mixed implicit and normal rules. Stop.

但是很明显，此法，代价太大：

使得整个系统中的make，都从3.82降级到3.81了。

总的来说，也不算好事。

并且，像是Cygwin中，去更换某个版本的软件包的话，相对来说，还比较麻烦。

而Linux系统，比如Ubuntu中，如果你用的源中没有3.81的make的话，还涉及到先换源

总之，就是很麻烦。

所以，一般来说，都还是用下面介绍的这个更好的办法：

第 5.2.1.5.2.2 节 “用crosstool-ng中提供的3.81的make（而不用更换系统环境中的3.82的make）”

最终，后来通过：

【已解决】crosstool-ng在Installing C library headers & start files期间出错：Makefile:240: *** mixed implicit and normal rules. Stop.

而去通过更改crosstool-ng中的配置，得以实现：

直接使用crosstool-ng中提供的那个3.81的make

而实现：

不仅解决了此处的问题：

Makefile:xxx: *** mixed implicit and normal rules. Stop.

而且，无需更改当前系统的3.82的make

也无需去手动更改出错的每一个makefile了。

对应的做法是：

ct-ng menuconfig

去如下配置：

Paths and misc options  —>
    [*] Try features marked as EXPERIMENTAL
Companion tools  —>
    [*] Build some companion tools
    [*]   make

                    

Try features marked as EXPERIMENTAL对应的help帮助内容为：

  ┌───────────────────────── Try features marked as EXPERIMENTAL ─────────────────────────┐
  │ CT_EXPERIMENTAL:                                                                      │
  │                                                                                       │
  │ If you set this to Y, then you will be able to try very experimental                  │
  │ features.                                                                             │
  │                                                                                       │
  │ Experimental features can be one of:                                                  │
  │   - working, in which case you should tell me it is!                                  │
  │   - buggy, in which case you could try patching and send me the result                │
  │   - unfinished, in which case you could try hacking it and send me the result         │
  │   - non-existant, in which case you could also try hacking it in and send me          │
  │     the result                                                                        │
  │                                                                                       │
  │ Symbol: EXPERIMENTAL [=y]                                                             │
  │ Type  : boolean                                                                       │
  │ Prompt: Try features marked as EXPERIMENTAL                                           │
  │   Defined at config/global/ct-behave.in:18                                            │
  │   Location:                                                                           │
  │     -> Paths and misc options                                                         │

                    

以及：

Build some companion tools对应的help帮助内容为：

  ┌───────────────────────────── Build some companion tools ──────────────────────────────┐
  │ CT_COMP_TOOLS:                                                                        │
  │                                                                                       │
  │ Crosstool-NG relies on some external tools to be recent enough, namely:               │
  │   make = 3.81 (in some cases)                                                         │
  │   m4 >= 1.4.12                                                                        │
  │   autoconf >= 2.63                                                                    │
  │   automake >= 1.10.2                                                                  │
  │   libtool >= 2.2.4                                                                    │
  │                                                                                       │
  │ If your system has older versions, we can build them for you,                         │
  │ but you are strongly encouraged to update your system instead!                        │
  │                                                                                       │
  │ Symbol: COMP_TOOLS [=y]                                                               │
  │ Type  : boolean                                                                       │
  │ Prompt: Build some companion tools                                                    │
  │   Defined at config/companion_tools.in:8                                              │
  │   Depends on: EXPERIMENTAL [=y]                                                       │
  │   Location:                                                                           │
  │     -> Companion tools                                                                │

                    

如此，再去继续重新编译，可以看到对应的编译输出信息：

[EXTRA]    Extracting ‘make-3.81′
[EXTRA]    Patching ‘make-3.81′
[EXTRA]    =================================================================
[EXTRA]    Installing make
[02:14] |

                    

即，去下载并编译对应的3.81的make，供后续使用了。

至此，才算是比较完美的解决此处的问题。