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SCons / DebuggingScons

Tips for debugging SCons code and your scripts

To use local scons source rather than installed:

Put these lines in a shell script and run the script. If you want to run it regularly, make the script executable and put it in your private bin directory.

exec python /path_to_scons/src/script/scons.py .

You can also run from a checked-out SCons source dir using bootstrap.py, which takes the same args as SCons. That should always use the SCons engine from where bootstrap.py is found.

python /path_to_scons_src/bootstrap.py .

If you run the commands by hand, don't include the "exec" in the final line.

To run under debugger:

scons --debug=pdb <args...>
b SCons/Tool/msvc.py:158 # to stop at that file:line, looks for file in sys.path e.g. your SCONS_LIB_DIR

Debugging in Eclipse/PyDev

Laurent Marchelli:

I use Eclipse PyDev visual debugger instead than pbd, it works to dig into scons and for debugging my SConscript even on my bitbucket fork (PyDev environment : SCONS_LIB_DIR=C:\dev\scons\scons-morpheus\src\engine).

For debugging test scripts (runtest.py), this solution has to get extended somewhat:

Because runtest.py launch another process to execute the test, the pydev debugger is not enough, the pydev remote debugger must be used.

Solution in 5 steps:

  1. Into your debug configuration's environment variables, add the PYTHONPATH to the pydevd.py script.(Pydev Remote debugger)
  2. Add following line at the top of your test script (e.g. msvsTests.py) * import pydevd; pydevd.settrace()
  3. Launch PyDev Debug Server.
  4. Launch the debugger on runtest.py, the remote debugger will handle the break into your test script.
  5. Enjoy ;-)