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bugpoint.rst: yosys -h bugpoint does work

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I just missed that it only gets included in the makefile if `DISABLE_SPAWN` is set, because I was looking for the C define `YOSYS_DISABLE_SPAWN`.
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Krystine Sherwin 2025-04-26 14:37:37 +12:00
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docs/source/using_yosys/bugpoint.rst
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@ -49,24 +49,10 @@ The first thing to be aware of is that `bugpoint` is not available in every
build of Yosys. Because the command works by invoking external processes, it
requires that Yosys can spawn executables. Notably this means `bugpoint` is not
able to be used in WebAssembly builds such as that available via YoWASP. The
easiest way to check your build of Yosys is by running ``yosys -qq -p '!echo
test'``. If this echoes ``test`` in the console, then `bugpoint` will work as
expected. If instead if it displays the text ``ERROR: Shell is not available.``
then `bugpoint` will not work either.
.. note::
The console command ``yosys -qq -p '!echo test'`` uses the ``-qq`` flag to
prevent Yosys from outputting non-error messages to the console. The ``-p``
option executes ``!echo test`` as a Yosys command, attempting to pass ``echo
test`` to the shell for execution. For more about the ``-p`` option and
common pitfalls, check out :ref:`getting_started/scripting_intro:script
parsing` in the :doc:`/getting_started/index` section.
.. TODO:: Add ``YOSYS_DISABLE_SPAWN`` check in ``bugpoint.cc``.
At least in the help text, so that ``yosys -h bugpoint`` will correctly
indicate if the command will work instead of this roundabout method.
easiest way to check your build of Yosys is by running ``yosys -h bugpoint``. If
Yosys displays the help text for `bugpoint` then it is available for use, but if
it instead prints "No such command or cell type: bugpoint", then `bugpoint` is
not available.
Next you need to separate loading the design from the failure point; you should
be aiming to reproduce the failure by running ``yosys -s <load.ys> -s
@ -315,6 +301,15 @@ used.
remove context and lead to over-minimizing scripts, hiding underlying issues.
Check out :ref:`using_yosys/bugpoint:Why context matters` to learn more.
When a problem is occurring many steps into a script, minimizing the design at
the start of the script isn't always enough to identify the cause of the issue.
Each extra step of the script can lead to larger sections of the input design
being needed for the specific problem to be preserved until it causes a crash.
So to find the smallest possible reproducer it can sometimes be helpful to
remove commands prior to the failure point.
- try ``write_rtlil <design.il>; design -reset; read_rtlil <design.il>;`` before
the failure point
@ -588,8 +583,8 @@ Reproduction Steps
+ you can browse the source repository for a certain commit with the failure
and open the source file, select the relevant lines (click on the line
number for the first relevant line, then while holding shift click on the
line number for the last relevant line), click on the `...` that appears and
select "Copy permalink"
line number for the last relevant line), click on the ``...`` that appears
and select "Copy permalink"
+ should look something like
``https://github.com/YosysHQ/yosys/blob/<commit_hash>/path/to/file#L139-L147``
+ clicking on "Preview" should reveal a code block containing the lines of