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2920 :: [Solved] How do I debug the Nim compiler?

• Krux02 (orginal) [2017-04-19T21:14:59+02:00] view original

  I have a problem I have absolutely no clue why this happens: https://github.com/nim-lang/Nim/pull/5664

  In order to find out why this happens I would like to debug the compiler. Since I think that the problem is somewhere in the generated C code I would like to debug the generated C code. This means I would like to compile the nim files in release mode (no source map), but then when I compile the c files, I would like to compile them with debug information, so that I can see where in the C code I am. So how can I do this?

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• Araq (orginal) [2017-04-19T21:48:18+02:00] view original

  Your problem is very unlikely to be in the generated C code and just a logical bug. (Of course that's just a very educated guess though.)

  Your question is easily answered when you consider that compiler flags are orthogonal, so -d:release --debugger:native works. Or --checks:off --lineDir:off --debugger:native.

  nim.cfg contains this:

  
  @if release or quick:
    obj_checks:off
    field_checks:off
    range_checks:off
    bound_checks:off
    overflow_checks:off
    assertions:off
    stacktrace:off
    linetrace:off
    debugger:off
    line_dir:off
    dead_code_elim:on
  @end
  
  @if release:
    opt:speed
  @end
  Run

  Knowing this, you can also use -d:quick --debugger:native.

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• Krux02 (orginal) [2017-04-19T21:59:38+02:00] view original

  Thanks a lot for this information. I got the problem and yes it was not a bug in the generated source code. But still without the dubugger I had no chance of finding it, because there was a hidden layer of function calls that I was simply not able to see at all.

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