https://sourceforge.net/p/python-mode/bugs/12/2004-03-09T06:34:56ZRecent changes to 12: python-mode kills arrow in gdb (gud.el)2004-03-09T06:34:56Z2004-03-09T06:34:56ZMatthias Klosehttps://sourceforge.net/u/doko/https://sourceforge.net95c64812bb02e0769e1e4724951040ae5c5e9a09

<div class="markdown_content"><p>[this is <a href="http://python.org/sf/606250" rel="nofollow">http://python.org/sf/606250</a>, reopened]<br /> forwarded from <a href="http://bugs.debian.org/159628" rel="nofollow">http://bugs.debian.org/159628</a> ]</p> <p>Once python-mode.el has been loaded, all GDB buffers<br /> stop showing the little arrow that lives in the<br /> "fringe" on the left side of an emacs21 frame. To be<br /> specific, the arrow appears and then disappears right<br /> away, each time a 'step' or 'next' command is run. I<br /> traced the problem down to the unconditional hooking of<br /> 'comint-output-filter-functions, python-mode.el line<br /> 3472 to be exact:</p> <p>(add-hook 'comint-output-filter-functions<br /> 'py-pdbtrack-track-stack-file)</p> <p>I haven't tested it fully, but I've found that if I<br /> take this line out, GDB can show its arrow once more.<br /> There is code in python-mode.el to insert this hook in<br /> a buffer-local fashion only in the '*Python*' buffer..<br /> maybe that should be reviewed and used instead of this<br /> global hook?</p> <p>(took forever to figure out it was python-mode causing<br /> the problem..)</p> <p>Followup:</p> <p>This one is still broken for me, in python-mode 4.40. (I'm<br /> the submitter of the original debian bug report).</p> <p>Here are some instructions to reproduce the problem:</p> <p>===============<br /> 574:warner@cinla% cat hello.c <br /> #include &lt;stdio.h&gt;</p> <p>int main(void)<br /> {<br /> printf("hello\n");<br /> printf("world\n");<br /> printf("\n");<br /> return 0;<br /> }<br /> 575:warner@cinla% gcc -g -o hello hello.c<br /> 576:warner@cinla% ./hello <br /> hello<br /> world</p> <p>577:warner@cinla% cat foo.py<br /> #! /usr/bin/python</p> <p>print "hiya"<br /> 578:warner@cinla% emacs -q</p> <p>M-x gdb hello RET # starts GUD session<br /> (gdb) b main RET<br /> (gdb) run RET # GDB stops on "hello".<br /> Note<br /> arrow in fringe.<br /> C-x C-f foo.py RET # loads python-mode.el<br /> C-x b *gud-hello* RET # switch back to GDB buffer<br /> (gdb) next RET # GDB stops on "world".<br /> Note<br /> lack of arrow.<br /> (gdb) next RET # arrow flickers and<br /> disappears each time<br /> ===================</p> <p>emacs-version reports "GNU Emacs 21.3.1 (i386-pc-linux-gnu,<br /> X toolkit) of 2003-10-31 on raven, modified by Debian"<br /> this is package emacs21, version 21.3+1-4 (from unstable)<br /> python-elisp is version 2.3.2.91-1, with py-version at<br /> $Revision: 4.40 $</p> <p>let me know if there is anything I can do to further track<br /> it down.<br /> thanks!<br /> -Brian</p></div>