Re: Recent changes in gdb-ui.el

[storm@cua.dk (Kim F. Storm)]

[This is extracted from my response to Nick Roberts re. supporting
 GDB overlay arrows at C and assembler levels simultaneiously.
 It hit the emacs-devel bit-bucket on Mar 02. ++kfs]


I have just installed changed to properly support multiple overlay
arrows.

[Some packages attempts to do this by making overlay-arrow-position
buffer local, but that doesn't really work well with the redisplay
code, as it may fail to notice changes to an overlay arrow in some
cases.]

To create an additional overlay arrow, create a new variable similar
to overlay-arrow-position, e.g.  gdb-asm-overlay-arrow-position and
add it to the new variable overlay-arrow-variable-list; like this:

 (push 'gdb-asm-overlay-arrow-position overlay-arrow-variable-list)

Then you can use gdb-asm-overlay-arrow-position just like the
overlay-arrow-position variable.

If you want to use a different fringe bitmap for the asm bitmap,
you can set it with

 (require 'fringe)
 (put 'gdb-asm-overlay-arrow-position 'overlay-arrow-bitmap
       right-truncation-fringe-bitmap)   ; the -> arrow

-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk