yosys/docs/source/appendix/env_vars.rst

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Yosys environment variables
===========================
``HOME``
Yosys command history is stored in :file:`$HOME/.yosys_history`. Graphics
(from :cmd:ref:`show` and :cmd:ref:`viz` commands) will output to this
directory by default. This environment variable is also used in some cases
for resolving filenames with :file:`~`.
``PATH``
May be used in OpenBSD builds for finding the location of Yosys executable.
``TMPDIR``
Used for storing temporary files.
``ABC``
When compiling Yosys with out-of-tree ABC using :makevar:`ABCEXTERNAL`, this
variable can be used to override the external ABC executable.
``YOSYS_NOVERIFIC``
If Yosys was built with Verific, this environment variable can be used to
temporarily disable Verific support.
``YOSYS_COVER_DIR`` and ``YOSYS_COVER_FILE``
When using code coverage, these environment variables control the output file
name/location.
``YOSYS_ABORT_ON_LOG_ERROR``
Can be used for debugging Yosys internals. Setting it to 1 causes abort() to
be called when Yosys terminates with an error message.