Installation ------------ This document will guide you through the process of installing Yosys. CAD suite(s) ~~~~~~~~~~~~ Yosys is part of the `Tabby CAD Suite `_ and the `OSS CAD Suite `_! The easiest way to use yosys is to install the binary software suite, which contains all required dependencies and related tools. * `Contact YosysHQ `_ for a `Tabby CAD Suite `_ Evaluation License and download link * OR go to https://github.com/YosysHQ/oss-cad-suite-build/releases to download the free OSS CAD Suite * Follow the `Install Instructions on GitHub `_ Make sure to get a Tabby CAD Suite Evaluation License if you need features such as industry-grade SystemVerilog and VHDL parsers! For more information about the difference between Tabby CAD Suite and the OSS CAD Suite, please visit https://www.yosyshq.com/tabby-cad-datasheet Many Linux distributions also provide Yosys binaries, some more up to date than others. Check with your package manager! Targeted architectures ^^^^^^^^^^^^^^^^^^^^^^ The `OSS CAD Suite`_ releases `nightly builds`_ for the following architectures: .. only:: html - linux-x64 |linux-x64| - Most personal Linux based computers - darwin-x64 |darwin-x64| - macOS 12 or later with Intel CPU - darwin-arm64 |darwin-arm64| - macOS 12 or later with M1/M2 CPU - windows-x64 |windows-x64| - Targeted for Windows 10 and 11 - linux-arm64 |linux-arm64| .. _OSS CAD Suite: https://github.com/YosysHQ/oss-cad-suite-build .. _nightly builds: https://github.com/YosysHQ/oss-cad-suite-build/releases/latest .. |linux-x64| image:: https://github.com/YosysHQ/oss-cad-suite-build/actions/workflows/linux-x64.yml/badge.svg .. |darwin-x64| image:: https://github.com/YosysHQ/oss-cad-suite-build/actions/workflows/darwin-x64.yml/badge.svg .. |darwin-arm64| image:: https://github.com/YosysHQ/oss-cad-suite-build/actions/workflows/darwin-arm64.yml/badge.svg .. |windows-x64| image:: https://github.com/YosysHQ/oss-cad-suite-build/actions/workflows/windows-x64.yml/badge.svg .. |linux-arm64| image:: https://github.com/YosysHQ/oss-cad-suite-build/actions/workflows/linux-arm64.yml/badge.svg Building from source ~~~~~~~~~~~~~~~~~~~~ The Yosys source files can be obtained from the `YosysHQ/Yosys git repository`_. `ABC`_ and some of the other libraries used are included as git submodules. To clone these submodules at the same time, use e.g.: .. code:: console git clone --recurse-submodules https://github.com/YosysHQ/yosys.git # ..or.. git clone https://github.com/YosysHQ/yosys.git cd yosys git submodule update --init --recursive .. _YosysHQ/Yosys git repository: https://github.com/yosyshq/yosys/ .. _ABC: https://github.com/berkeley-abc/abc .. note:: As of Yosys v0.47, releases include a ``yosys.tar.gz`` file which includes all source code and all sub-modules in a single archive. This can be used as an alternative which does not rely on ``git``. Supported platforms ^^^^^^^^^^^^^^^^^^^ The following platforms are supported and regularly tested: - Linux - macOS Other platforms which may work, but instructions may not be up to date and are not regularly tested: - FreeBSD - WSL - Windows with (e.g.) Cygwin Build prerequisites ^^^^^^^^^^^^^^^^^^^ A C++ compiler with C++17 support is required as well as some standard tools such as GNU Flex, GNU Bison, Make and Python. Some additional tools: readline, libffi, Tcl and zlib; are optional but enabled by default (see :makevar:`ENABLE_*` settings in Makefile). Graphviz and Xdot are used by the `show` command to display schematics. Installing all prerequisites for Ubuntu 20.04: .. code:: console sudo apt-get install gperf build-essential bison flex \ libreadline-dev gawk tcl-dev libffi-dev git graphviz \ xdot pkg-config python3 libboost-system-dev \ libboost-python-dev libboost-filesystem-dev zlib1g-dev Installing all prerequisites for macOS 13 (with Homebrew): .. code:: console brew tap Homebrew/bundle && brew bundle or MacPorts: .. code:: console sudo port install bison flex readline gawk libffi graphviz \ pkgconfig python311 boost zlib tcl On FreeBSD use the following command to install all prerequisites: .. code:: console pkg install bison flex readline gawk libffi graphviz \ pkgconf python311 tcl-wrapper boost-libs .. note:: On FreeBSD system use gmake instead of make. To run tests use: ``MAKE=gmake CXX=cxx CC=cc gmake test`` For Cygwin use the following command to install all prerequisites, or select these additional packages: .. code:: console setup-x86_64.exe -q --packages=bison,flex,gcc-core,gcc-g++,git,libffi-devel,libreadline-devel,make,pkg-config,python3,tcl-devel,boost-build,zlib-devel .. warning:: As of this writing, Cygwin only supports up to Python 3.9.16 while the minimum required version of Python is 3.11. This means that Cygwin is not compatible with many of the Python-based frontends. While this does not currently prevent Yosys itself from working, no guarantees are made for continued support. It is instead recommended to use Windows Subsystem for Linux (WSL) and follow the instructions for Ubuntu. .. For MSYS2 (MINGW64): .. code:: console pacman -S bison flex mingw-w64-x86_64-gcc git libffi-devel libreadline-devel make pkg-config python3 tcl-devel mingw-w64-x86_64-boost zlib-devel Not that I can get this to work; it's failing during ld with what looks like math library issues: ``multiple definition of `tanh'`` and ``undefined reference to `__imp_acosh'``, as well as issues in `aiger2` with ``seekg`` et al not being available. .. note:: The ``config-msys2-64`` target uses the ``mingw-w64-x86_64-`` prefixed compiler in order to allow compiled exe files to be run without an MSYS2 shell. Build configuration ^^^^^^^^^^^^^^^^^^^ The Yosys build is based solely on Makefiles, and uses a number of variables which influence the build process. The recommended method for configuring builds is with a ``Makefile.conf`` file in the root ``yosys`` directory. The following commands will clean the directory and provide an initial configuration file: .. code:: console make config-clang # ..or.. make config-gcc Check the root Makefile to see what other configuration targets are available. Other variables can then be added to the ``Makefile.conf`` as needed, for example: .. code:: console echo "ENABLE_ZLIB := 0" >> Makefile.conf Using one of these targets will set the ``CONFIG`` variable to something other than ``none``, and will override the environment variable for ``CXX``. To use a different compiler than the default when building, use: .. code:: console make CXX=$CXX # ..or.. make CXX="g++-11" .. note:: Setting the compiler in this way will prevent some other options such as ``ENABLE_CCACHE`` from working as expected. If you have clang, and (a compatible version of) ``ld.lld`` available in PATH, it's recommended to speed up incremental builds with lld by enabling LTO with ``ENABLE_LTO=1``. On macOS, LTO requires using clang from homebrew rather than clang from xcode. For example: .. code:: console make ENABLE_LTO=1 CXX=$(brew --prefix)/opt/llvm/bin/clang++ By default, building (and installing) yosys will build (and install) `ABC`_, using :program:`yosys-abc` as the executable name. To use an existing ABC executable instead, set the ``ABCEXTERNAL`` make variable to point to the desired executable. Running the build system ^^^^^^^^^^^^^^^^^^^^^^^^ From the root ``yosys`` directory, call the following commands: .. code:: console make sudo make install To use a separate (out-of-tree) build directory, provide a path to the Makefile. .. code:: console mkdir build; cd build make -f ../Makefile Out-of-tree builds require a clean source tree. .. seealso:: Refer to :doc:`/yosys_internals/extending_yosys/test_suites` for details on testing Yosys once compiled. Source tree and build system ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The Yosys source tree is organized into the following top-level directories: ``backends/`` This directory contains a subdirectory for each of the backend modules. ``docs/`` Contains the source for this documentation, including images and sample code. ``examples/`` Contains example code for using Yosys with some other tools including a demo of the Yosys Python api, and synthesizing for various toolchains such as Intel and Anlogic. ``frontends/`` This directory contains a subdirectory for each of the frontend modules. ``kernel/`` This directory contains all the core functionality of Yosys. This includes the functions and definitions for working with the RTLIL data structures (:file:`rtlil.{h|cc}`), the ``main()`` function (:file:`driver.cc`), the internal framework for generating log messages (:file:`log.{h|cc}`), the internal framework for registering and calling passes (:file:`register.{h|cc}`), some core commands that are not really passes (:file:`select.cc`, :file:`show.cc`, …) and a couple of other small utility libraries. ``libs/`` Libraries packaged with Yosys builds are contained in this folder. See :doc:`/appendix/auxlibs`. ``misc/`` Other miscellany which doesn't fit anywhere else. ``passes/`` This directory contains a subdirectory for each pass or group of passes. For example as of this writing the directory :file:`passes/hierarchy/` contains the code for three passes: `hierarchy`, `submod`, and `uniquify`. ``techlibs/`` This directory contains simulation models and standard implementations for the cells from the internal cell library. ``tests/`` This directory contains the suite of unit tests and regression tests used by Yosys. See :doc:`/yosys_internals/extending_yosys/test_suites`. The top-level Makefile includes :file:`frontends/{*}/Makefile.inc`, :file:`passes/{*}/Makefile.inc` and :file:`backends/{*}/Makefile.inc`. So when extending Yosys it is enough to create a new directory in :file:`frontends/`, :file:`passes/` or :file:`backends/` with your sources and a :file:`Makefile.inc`. The Yosys kernel automatically detects all commands linked with Yosys. So it is not needed to add additional commands to a central list of commands. Good starting points for reading example source code to learn how to write passes are :file:`passes/opt/opt_dff.cc` and :file:`passes/opt/opt_merge.cc`. Users of the Qt Creator IDE can generate a QT Creator project file using make qtcreator. Users of the Eclipse IDE can use the "Makefile Project with Existing Code" project type in the Eclipse "New Project" dialog (only available after the CDT plugin has been installed) to create an Eclipse project in order to programming extensions to Yosys or just browse the Yosys code base.