谁能帮我看看下面的emacs扩展中的一段代码什么意思

elais

1. (and (display-images-p)
   
2.      (define-fringe-bitmap 'breakpoint
   
3.        "\x3c\x7e\xff\xff\xff\xff\x7e\x3c"))

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这三行在gdb-ui.el插件中的,加载错误:
Symbol's function definition is void:define-fringe-bitmap

把这三行注释掉就能通过

herberteuler

1. define-fringe-bitmap is a built-in function in `src/fringe.c'.
   
2. (define-fringe-bitmap bitmap bits &optional height width align)
   
3. 
   
4. Define fringe bitmap bitmap from bits of size height x width.
   
5. bitmap is a symbol or string naming the new fringe bitmap.
   
6. bits is either a string or a vector of integers.
   
7. height is height of bitmap.  If height is nil, use length of bits.
   
8. width must be an integer between 1 and 16, or nil which defaults to 8.
   
9. Optional fifth arg align may be one of `top', `center', or `bottom',
   
10. indicating the positioning of the bitmap relative to the rows where it
    
11. is used; the default is to center the bitmap.  Fourth arg may also be a
    
12. list (align PERIODIC) where PERIODIC non-nil specifies that the bitmap
    
13. should be repeated.
    
14. If bitmap already exists, the existing definition is replaced.

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就是那个三角。

1. display-images-p is a compiled Lisp function in `frame.el'.
   
2. (display-images-p &optional display)
   
3. 
   
4. Return non-nil if display can display images.
   
5. 
   
6. display can be a display name, a frame, or nil (meaning the selected
   
7. frame's display).

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你是怎么运行的？错误是什么？

elais

不是运行了，就是有个gdb-ui.el的包里有这三句话
然后我在.emacs里加上了
(add-to-list 'load-path "~/download")
(require 'gdb-ui)

然后在emacs中运行load-file ./.emacs，然后就挂了，错误提示如首贴

herberteuler

define-fringe-bitmap 是 Emacs CVS 里的源代码。你的 Emacs 什么版本？