前言

• 如今windows操作系统占用的内存越来越大，导致自己想自己开发【操作系统】。。。
• windows下安装【VM虚拟机】开发基于Linux的工程，感觉电脑内存吃不消
• windows下可以使用【Cygwin64 】解决一部分问题

Cygwin64 本身也是问题

• Cygwin64 由于工作在windows上，环境还是有区别与：Linux
• windows下的文件名称，不区分大小写，按时Linux文件名区分大小写
• windows 下的回车换行问题，最终发现是git 配置与拉代码引起的

git 正确的配置

• windows下的git 配置如下：

#提交时转换为LF，检出时转换为CRLF
$ git config --global core.autocrlf true
#提交时转换为LF，检出时不转换
$ git config --global core.autocrlf input

• 为何这么配置呢？这里是windows、Linux混合开发的场景下，回车换行问题突出，Linux下是sh文件，如果被自动增加\r，会造成各种异常的错误，无法正确的执行

问题如下

• 一台电脑上，使用【Cygwin64】正常的 make menuconfig
• 另一台电脑，git pull 代码后，发现各种错误，开始以为是Cygwin64没有安装全工具包，后面发现原来就是回车换行引起sh 文件无法正确运行引起的

$ git diff
warning: LF will be replaced by CRLF in .config.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in .config.old.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in .kconfig.d.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in include/autoconf.h.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in scripts/Kbuild.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in scripts/basic/.docproc.cmd.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in scripts/basic/.fixdep.cmd.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in scripts/basic/.split-include.cmd.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in scripts/gen_build_files.sh.
The file will have its original line endings in your working directory

• 不要让 git 改变回车换行，也就是Linux 本身的回车换行，拉下来时 windows git 可以增加\r，但是提交时，不需要增加\r。
• 以下大的错误，看似很多，就是 sh文件，被增加\r引起的。

$ make menuconfig
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/kxgettext.o
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/mconf
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 3: $'\r': command not found
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: syntax error near unexpected token `$'\r''
'cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: `ldflags()
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 3: $'\r': command not found
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: syntax error near unexpected token `$'\r''
'cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: `ldflags()
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 3: $'\r': command not found
/cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: syntax error near unexpected token `$'\r''
'cygdrive/d/github/pluto-os_hello/scripts/kconfig/lxdialog/check-lxdialog.sh: line 5: `ldflags()
  HOSTCC  scripts/kconfig/lxdialog/checklist.o
In file included from scripts/kconfig/lxdialog/checklist.c:24:
scripts/kconfig/lxdialog/dialog.h:31:10: error: #include expects "FILENAME" or <FILENAME>
   31 | #include CURSES_LOC

小结

• 正确理解 git CRLF的配置问题
• 注意Linux、windows混合开发过程中git的配置引起的问题
• 注意Linux sh 文件不允许增加额外的：\r 的问题