在 emacs gdb 中调试时更改工作目录？

Question

As I open emacs and enter :

M+x gdb

Run gdb (like this): gdb im=mi /home/qinchen/major/caffe/caffe_gdb/build/tools/caffe

And then input:

run train --solver=examples/mnist/lenet_solver.prototxt

But it reports : i

o.cpp Check failed: fd!=-1. file not found:examples/mnist/lenet_solver.prototxt

I guess if the error is triggered by emacs' current working directory is not in CAFFE_ROOT. Since as I debug in linux terminal in CAFFE_ROOT directory with

gdb --args build/tools/caffe train --solver=examples/mnist/lenet_solver.prototxt

I can successfully debug this demo.So can anyone help me to set emacs working directory to CAFFE_ROOT when debug in gdb to eliminate the error reported above?

Answer 1

simple:

M+x gdb
gdb -i=mi -cd /home/qinchen/major/caffe/caffe_gdb --args build/tools/caffe train --solver=examples/mnist/lenet_solver.prototx

Answer 2

I personally find it pretty annoying copying and pasting the absolute path to my executable so I normally just run it this way:

M+x then gdb and run with the default command: gdb -i=mi

Better yet, if you use Projectile, you can do projectile-run-gdb (or Cc pxg ) to run gdb with the project root as the CWD. This way you can just pass: gdb -i=mi build/tools/caffe . This is pretty handy for me since my build directory is normally in my project root.

If you don't use projectile, when in the gdb interface, doing pwd tells you where you are. I just usually have to cd once or twice to get to the working directory I'd like to be in. Then just doing file build/tools/caffe opens the file for debugging and you're ready to go.

Pasting or editing paths/args into the mini-buffer can be infuriating for me. This way I just run it, change a directory or two, and work with a relative path as I would in the console.