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Merge pull request #11613 from ethereum/doc-evmone-searchpath

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[docs] contributing.rst: Documents evmone.so loading search paths.
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@ -86,12 +86,10 @@ Running the Compiler Tests
Prerequisites
-------------
Some tests require the `evmone <https://github.com/ethereum/evmone/releases>`_
library, others require `libz3 <https://github.com/Z3Prover/z3>`_. The test script
tries to discover the location of the ``evmone`` library, which can be located
in the current directory, installed on the system level, or the ``deps`` folder
in the project top level. The required file is called ``libevmone.so`` on Linux
systems, ``evmone.dll`` on Windows systems and ``libevmone.dylib`` on macOS.
For running all compiler tests you may want to optionally install a few
dependencies (`evmone <https://github.com/ethereum/evmone/releases>`_,
`libz3 <https://github.com/Z3Prover/z3>`_, and
`libhera <https://github.com/ewasm/hera>`_).
On macOS some of the testing scripts expect GNU coreutils to be installed.
This can be easiest accomplished using Homebrew: ``brew install coreutils``.
@ -108,13 +106,29 @@ including those bundled into the `Boost C++ Test Framework <https://www.boost.or
application ``soltest`` (or its wrapper ``scripts/soltest.sh``), as well as command line tests and
compilation tests.
The test system automatically tries to discover the location of the ``evmone`` library
starting from the current directory. The required file is called ``libevmone.so`` on Linux systems,
``evmone.dll`` on Windows systems and ``libevmone.dylib`` on macOS. If it is not found, tests that
use it are skipped. These tests are ``libsolididty/semanticTests``, ``libsolidity/GasCosts``,
``libsolidity/SolidityEndToEndTest``, part of the soltest suite. To run all tests, download the library from
`GitHub <https://github.com/ethereum/evmone/releases/tag/v0.8.0>`_
and place it in the project root path or inside the ``deps`` folder.
The test system automatically tries to discover the location of
the `evmone <https://github.com/ethereum/evmone/releases>`_ for running the semantic tests.
The ``evmone`` library must be located in the ``deps`` or ``deps/lib`` directory relative to the
current working directory or up to the project root. Alternatively an explicit location
to the ``evmone`` shared object can be specified via the ``ETH_EVMONE`` environment variable.
If running semantic tests is not required, the command line
parameter ``--no-semantic-tests`` must be passed to ``./scripts/soltest.sh``.
The tests that use ``evmone`` are ``libsolidity/semanticTests``, ``libsolidity/GasCosts``,
``libsolidity/SolidityEndToEndTest``.
Running Ewasm tests is disabled by default and can be explicitly enabled
via ``./scripts/soltest.sh --ewasm`` and requires `hera <https://github.com/ewasm/hera>`_
to be found by ``soltest``.
The ``hera`` library can is using the same search path as described above for ``evmone``.
The ``evmone`` and ``hera`` libraries should both end with the file name
extension ``.so`` on Linux, ``.dll`` on Windows systems and ``.dylib`` on macOS.
For running SMT tests, the ``libz3`` library must be installed and locatable
by ``cmake`` during compiler configure stage.
If the ``libz3`` library is not installed on your system, you should disable the
SMT tests by exporting ``SMT_FLAGS=--no-smt`` before running ``./scripts/tests.sh`` or