使用Clewn连接gvim和gdb

   Clewn是一个把gvim和gdb连接起来的工具，使得在调试时代码可以显示在gvim中，得到类似在IDE中的效果。使用Clewn不需要修改vim 源代码。另外一个把vim和gdb结合起来的工具：vimgdb则需要修改vim源代码，并重新编译vim。但是Clewn必须需要有GUI的 gvim，vimgdb则在gvim和vim中都可以达到效果。

使用Clewn一般步骤如下：

$clewn -va your_source.cpp

此时进入gdb命令行界面，并且gvim自动打开your_source.cpp文件。

(gdb)file your_execute

获得要调试文件的symbols

然后就可以在(gdb)中使用b main等命令设置断点。也可以在gvim中使用ctrl+b来设置断点（第一次设断点的时候ctrl+b要按两下才有效，不知道是不是bug）。
clewn在gvim中设置的快捷键：

List of default key mappings:

    CTRL-Z send an interrupt to GDB and the program it is running

    B info breakpoints

    L info locals

    A info args

    S step

    I stepi

    CTRL-N next: next source line, skipping all function calls

    X nexti

    F finish

    R run

    Q quit

    C continue

    W where

    CTRL-U up: go up one frame

    CTRL-D down: go down one frame

cursor position:

    CTRL-B set a breakpoint on the line where the cursor is located

    CTRL-E clear all breakpoints on the line where the cursor is located

mouse pointer position:

    CTRL-P print the value of the variable defined by the mouse pointer position

    CTRL-X print the value that is referenced by the address whose value is that of the variable defined by the mouse pointer position

    CTRL-K set a breakpoint at assembly address shown by mouse position

    CTRL-H clear a breakpoint at assembly address shown by mouse position

    CTRL-J add the selected variable at mouse position to the watched variables window