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Testa först

Innan du går igenom avbuggningssmärtan, använd testramverket för att kontrollera om standardtesterna fungerar korrekt. Om inte så kanske det kan bero på en trasig installation.

Before you go through the pain of debugging use the Test framework to check if the standard tests work properly. If they do not run complete there is possibly a broken installation.


Avbuggningen av FreeCAD stöds av en del interna mekanismer. Kommandoradsversionen av FreeCAD erbjuder alternativ för avbuggningsstöd:

Med "v" alternativet så ger FreeCAD en mer pratig utmatning.
Med "l" alternativet så skriver FreeCAD extra information till en loggfil.

The debugging of FreeCAD is supported by a few internal mechanisms. The command line version of FreeCAD provides some options for debugging support.

These are the currently recognized options in FreeCAD 0.19:

Generic options:

 -v [ --version ]          Prints version string
 -h [ --help ]             Prints help message
 -c [ --console ]          Starts in console mode
 --response-file arg       Can be specified with '@name', too
 --dump-config             Dumps configuration
 --get-config arg          Prints the value of the requested configuration key


 -l [ --write-log ]        Writes a log file to:
                           $HOME/.FreeCAD/FreeCAD.log (Linux)
                           $HOME/Library/Preferences/FreeCAD/FreeCAD.log (macOS)
                           %APPDATA%\FreeCAD\FreeCAD.log (Windows)
 --log-file arg            Unlike to --write-log this allows to log to an 
                           arbitrary file
 -u [ --user-cfg ] arg     User config file to load/save user settings
 -s [ --system-cfg ] arg   System config file to load/save system settings
 -t [ --run-test ] arg     Test case - or 0 for all
 -M [ --module-path ] arg  Additional module paths
 -P [ --python-path ] arg  Additional Python paths
 --single-instance         Allow to run a single instance of the application

Generating a Backtrace

If you are running a version of FreeCAD from the bleeding edge of the development curve, it may "crash". You can help solve such problems by providing the developers with a "backtrace". To do this, you need to be running a "debug build" of the software. "Debug build" is a parameter that is set at compile time, so you'll either need to compile FreeCAD yourself, or obtain a pre-compiled "debug" version.

For Linux

Linux Debugging →


  • software package gdb installed
  • a debug build of FreeCAD (at this time only available by building from source)
  • a FreeCAD model that causes a crash

Steps: Enter the following in your terminal window:

Find FreeCAD binary on your system:

$ whereis freecad
freecad: /usr/local/freecad <--- for example

$ cd /usr/local/freecad/bin
$ gdb FreeCAD

GNUdebugger will output some initializing information. The (gdb) shows GNUDebugger is running in the terminal, now input:

(gdb) handle SIG33 noprint nostop
(gdb) run

FreeCAD will now start up. Perform the steps that cause FreeCAD to crash or freeze, then enter in the terminal window:

(gdb) bt

This will generate a lengthy listing of exactly what the program was doing when it crashed or froze. Include this with your problem report.

(gdb) bt full

Print the values of the local variables also. This can be combined with a number to limit the number of frames shown.

For macOS

macOS Debugging →


  • software package lldb installed
  • a debug build of FreeCAD
  • a FreeCAD model that causes a crash

Steps: Enter the following in your terminal window:

$ cd FreeCAD/bin
$ lldb FreeCAD

LLDB will output some initializing information. The (lldb) shows the debugger is running in the terminal, now input:

(lldb) run

FreeCAD will now start up. Perform the steps that cause FreeCAD to crash or freeze, then enter in the terminal window:

(lldb) bt

This will generate a lengthy listing of exactly what the program was doing when it crashed or froze. Include this with your problem report.

List Libraries Loaded by FreeCAD

(Applicable to Linux and macOS)

Sometimes it's helpful to understand what libraries FreeCAD is loading, specifically if there are multiple libraries being loaded of the same name but different versions (version collision). In order to see which libraries are loaded by FreeCAD when it crashes you should open a terminal and run it in the debugger. In a second terminal window, find out the process id of FreeCAD:

ps -A | grep FreeCAD

Use the returned id and pass it to lsof:

lsof -p process_id

This prints a long list of loaded resources. So for example, if trying to ascertain if more than one Coin3d library versions is loaded, scroll through the list or search directly for Coin in the output:

lsof -p process_id | grep Coin

Python Debugging

For a more modern approach to debugging Python, see these posts:


winpdb Debugging →

Here is an example of using Winpdb inside FreeCAD:

We need the Python debugger: Winpdb. If you do not have it installed, on Ubuntu/Debian install it with:

sudo apt-get install winpdb

Now lets setup the debugger.

  1. Start Winpdb.
  2. Set the debugger password to "test": Go to menu FilePassword" and set the password.

Now we will run a test Python script in FreeCAD step by step.

  1. Run winpdb and set the password (e.g. test)
  2. Create a Python file with this content
import rpdb2
import FreeCAD
import Part
import Draft
print "hello"
print "hello"
import Draft
  1. Start FreeCAD and load the above file into FreeCAD
  2. Press F6 to execute it
  3. Now FreeCAD will become unresponsive because the Python debugger is waiting
  4. Switch to the Windpdb GUI and click on "Attach". After a few seconds an item "<Input>" appears where you have to double-click
  5. Now the currently executed script appears in Winpdb.
  6. Set a break at the last line and press F5
  7. Now press F7 to step into the Python code of Draft.makeWire

Visual Studio Code (VS Code)

VS Code Debugging →


  • ptvsd package need to be installed
pip install ptvsd

pypi page

Visual Studio Code documentation for remote debugging


  • Add following code at the beginning of your script
import ptvsd
print("Waiting for debugger attach")
# 5678 is the default attach port in the VS Code debug configurations
ptvsd.enable_attach(address=('localhost', 5678), redirect_output=True)
  • Add a debug configuration in Visual Studio Code Debug → Add Configurations…. It should looks like this :
    "configurations": [
            "name": "Python: Attacher",
            "type": "python",
            "request": "attach",
            "port": 5678,
            "host": "localhost",
            "pathMappings": [
                    "localRoot": "${workspaceFolder}",
                    "remoteRoot": "."
  • In VS Code add a breakpoint anywhere you want.
  • Launch the script in FreeCAD. FreeCAD freeze waiting for attachment.
  • In VS Code start debugging using created configuration. You should see variables in debugger area.
  • When setting breakpoints, VS Code will complain about not finding the .py file opened in the VS Code editor.
    • Change "remoteRoot": "." to "remoteRoot": "<directory of file>"
    • For example, if the Python file resides in /home/FC_myscripts/
    • Change to: "remoteRoot": "/home/FC_myscripts"
  • If your macro can't find ptvsd despite having installed it somewhere precede 'import ptvsd' with
from sys import path

where the path is to the directory where ptvsd got installed

  • On the left bottom edge of VSCode you can choose the Python executable - it's best to make this the version packaged with FreeCAD.

In the Mac package it is /Applications/FreeCAD.App/Contents/Resources/bin/python

You can locate it on your system by typing

import sys

into FreeCAD's Python console.

Debugging OpenCasCade

For developers needing to dig deeper in to the OpenCasCade kernel, user @abdullah has created a thread orientation discussing how to do so.