How do you debug sage's cython code.

[Volker Weißmann]

Hello,

let's say you are trying to figure out how sage's diff-function work. Maybe you write something like

#!/usr/bin/env sage
from sage.all import *
u = var('u')
breakpoint()
diff(sin(u), u)

and run it with ./filename.py . Once the breakpoint is encountered, you can use step to step into the diff function and place breakpoints with break filename:linenumber in sage's python code. I'm using this a lot and it works fine. Problems arise, once you try to debug cython code. Neither stepping nor placing breakpoints in the *.pyx file works.

I also tried https://trac.sagemath.org/ticket/13881, but this also works rather poorly.

How do you guys usually debug sage's cython code?

[Vincent Delecroix]

Hello,

https://cython.readthedocs.io/en/latest/src/userguide/debugging.html

[Vincent Delecroix]

Actually, what I use from time to time is

https://wiki.python.org/moin/DebuggingWithGdb

It works reasonably well (but a bit painful since the
C stack of a Python program is huge).

[Volker Weißmann]

Update: I found a solution and documented it here:

https://gitlab.com/volkerweissmann/cygdb_installation

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