godot-docs/contributing/development/compiling/compiling_for_windows.rst

.. _doc_compiling_for_windows:

Compiling for Windows
=====================

.. highlight:: shell

.. seealso::

    This page describes how to compile Windows editor and export template binaries from source.
    If you're looking to export your project to Windows instead, read :ref:`doc_exporting_for_windows`.

Requirements
------------

For compiling under Windows, the following is required:

- `Visual Studio Community <https://www.visualstudio.com/vs/community/>`_,
  version 2017 or later. VS 2019 is recommended.
  **Make sure to read "Installing Visual Studio caveats" below or you
  will have to run/download the installer again.**
- `MinGW-w64 <http://mingw-w64.org/>`_ with GCC can be used as an alternative to
  Visual Studio. Be sure to install/configure it to use the ``posix`` thread model.
  **Important:** When using MinGW to compile the ``master`` branch, you need GCC 9 or later.
- `Python 3.5+ <https://www.python.org/downloads/windows/>`_.
  **Make sure to enable the option to add Python to the ``PATH`` in the installer.**
- `SCons <https://www.scons.org/>`_ build system. Using the latest release is
  recommended, especially for proper support of recent Visual Studio releases.

.. note:: If you have `Scoop <https://scoop.sh/>`_ installed, you can easily
          install MinGW and other dependencies using the following command::

              scoop install gcc python scons make

.. note:: If you have `MSYS2 <https://www.msys2.org/>`_ installed, you can easily
          install MinGW and other dependencies using the following command::

              pacman -S mingw-w64-x86_64-python3-pip mingw-w64-x86_64-gcc  \
                  mingw-w64-i686-python3-pip mingw-w64-i686-gcc make

          For each MSYS2 MinGW subsystem, you should then run
          `pip3 install scons` in its shell.

.. seealso:: To get the Godot source code for compiling, see
             :ref:`doc_getting_source`.

             For a general overview of SCons usage for Godot, see
             :ref:`doc_introduction_to_the_buildsystem`.

Setting up SCons
----------------

To install SCons, open the command prompt and run the following command::

    python -m pip install scons

If you are prompted with the message
``Defaulting to user installation because normal site-packages is not
writeable``, you may have to run that command again using elevated
permissions. Open a new command prompt as an Administrator then run the command
again to ensure that SCons is available from the ``PATH``.

To check whether you have installed Python and SCons correctly, you can
type ``python --version`` and ``scons --version`` into a command prompt
(``cmd.exe``).

If the commands above don't work, make sure to add Python to your ``PATH``
environment variable after installing it, then check again.
You can do so by running the Python installer again and enabling the option
to add Python to the ``PATH``.

If SCons cannot detect your Visual Studio installation, it might be that your
SCons version is too old. Update it to the latest version with
``python -m pip install --upgrade scons``.

.. _doc_compiling_for_windows_install_vs:

Installing Visual Studio caveats
--------------------------------

If installing Visual Studio 2017 or 2019, make sure to enable **C++** in
the list of workflows to install.

If installing Visual Studio 2015, make sure to run a **Custom**
installation instead of **Typical** and select **C++** as a language there.

If you've already made the mistake of installing Visual Studio without
C++ support, run the installer again; it should present you a **Modify** button.
Running the installer from *Add/Remove Programs* will only give you
a **Repair** option, which won't let you install C++ tools.

Downloading Godot's source
--------------------------

Refer to :ref:`doc_getting_source` for detailed instructions.

The tutorial will assume from now on that you placed the source code in
``C:\godot``.

.. warning::

    To prevent slowdowns caused by continuous virus scanning during compilation,
    add the Godot source folder to the list of exceptions in your antivirus
    software.

    For Windows Defender, hit the :kbd:`Windows` key, type
    "Windows Defender Settings" then hit :kbd:`Enter`.
    Under **Virus & threat protection**, go to **Virus & threat protection setting**
    and scroll down to **Exclusions**. Click **Add or remove exclusions** then
    add the Godot source folder.

Compiling
---------

Selecting a compiler
~~~~~~~~~~~~~~~~~~~~

SCons will automatically find and use an existing Visual Studio installation.
If you do not have Visual Studio installed, it will attempt to use
MinGW instead. If you already have Visual Studio installed and want to
use MinGW, pass ``use_mingw=yes`` to the SCons command line. Note that MSVC
builds cannot be performed from the MSYS2 or MinGW shells. Use either
``cmd.exe`` or PowerShell instead.

During development, using the Visual Studio compiler is usually a better idea,
as it links the Godot binary much faster than MinGW. However, MinGW can
produce more optimized binaries using link-time optimization (see below),
making it a better choice for production use.

Running SCons
~~~~~~~~~~~~~

After opening a command prompt, change to the root directory of
the engine source code (using ``cd``) and type::

    C:\godot> scons platform=windows

You can specify a number of CPU threads to use to speed up the build::

    C:\godot> scons -j6 platform=windows

In general, it is OK to have at least as many threads compiling Godot as you
have cores in your CPU, if not one or two more. Feel free to add the ``-j``
option to any SCons command you see below.

.. note:: When compiling with multiple CPU threads, SCons may warn about
          pywin32 being missing. You can safely ignore this warning.

If all goes well, the resulting binary executable will be placed in
``C:\godot\bin\`` with the name ``godot.windows.tools.32.exe`` or
``godot.windows.tools.64.exe``. By default, SCons will build a binary matching
your CPU architecture, but this can be overridden using ``arch=x86_64`` or
``arch=x86_32``.

This executable file contains the whole engine and runs without any
dependencies. Running it will bring up the Project Manager.

.. note:: If you are compiling Godot for production use, then you can
          make the final executable smaller and faster by adding the
          SCons option ``target=template_release``.

          If you are compiling Godot with MinGW, you can make the binary
          even smaller and faster by adding the SCons option ``use_lto=yes``.
          As link-time optimization is a memory-intensive process,
          this will require about 7 GB of available RAM while compiling.

.. note:: If you want to use separate editor settings for your own Godot builds
          and official releases, you can enable
          :ref:`doc_data_paths_self_contained_mode` by creating a file called
          ``._sc_`` or ``_sc_`` in the ``bin/`` folder.

Development in Visual Studio
----------------------------

Using an IDE is not required to compile Godot, as SCons takes care of everything.
But if you intend to do engine development or debugging of the engine's C++ code,
you may be interested in configuring a code editor or an IDE.

Folder-based editors don't require any particular setup to start working with Godot's
codebase. To edit projects with Visual Studio they need to be set up as a solution.

You can create a Visual Studio solution via SCons by running SCons with
the ``vsproj=yes`` parameter, like this::

   scons p=windows vsproj=yes

You will be able to open Godot's source in a Visual Studio solution now,
and able to build Godot using Visual Studio's **Build** button.

.. seealso:: See :ref:`doc_configuring_an_ide_vs` for further details.

Cross-compiling for Windows from other operating systems
--------------------------------------------------------

If you are a Linux or macOS user, you need to install
`MinGW-w64 <https://mingw-w64.org/doku.php>`__, which typically comes in 32-bit
and 64-bit variants. The package names may differ based on your distribution,
here are some known ones:

+----------------+--------------------------------------------------------------+
| **Arch Linux** | ::                                                           |
|                |                                                              |
|                |     pacman -Sy mingw-w64                                     |
+----------------+--------------------------------------------------------------+
| **Debian** /   | ::                                                           |
| **Ubuntu**     |                                                              |
|                |     apt install mingw-w64                                    |
+----------------+--------------------------------------------------------------+
| **Fedora**     | ::                                                           |
|                |                                                              |
|                |     dnf install mingw64-gcc-c++ mingw64-winpthreads-static \ |
|                |                 mingw32-gcc-c++ mingw32-winpthreads-static   |
+----------------+--------------------------------------------------------------+
| **macOS**      | ::                                                           |
|                |                                                              |
|                |     brew install mingw-w64                                   |
+----------------+--------------------------------------------------------------+
| **Mageia**     | ::                                                           |
|                |                                                              |
|                |     urpmi mingw64-gcc-c++ mingw64-winpthreads-static \       |
|                |           mingw32-gcc-c++ mingw32-winpthreads-static         |
+----------------+--------------------------------------------------------------+

Before attempting the compilation, SCons will check for
the following binaries in your ``PATH`` environment variable::

    i686-w64-mingw32-gcc
    x86_64-w64-mingw32-gcc

If the binaries are not located in the ``PATH`` (e.g. ``/usr/bin``),
you can define the following environment variables to give a hint to
the build system::

    export MINGW32_PREFIX="/path/to/i686-w64-mingw32-"
    export MINGW64_PREFIX="/path/to/x86_64-w64-mingw32-"

To make sure you are doing things correctly, executing the following in
the shell should result in a working compiler (the version output may
differ based on your system)::

    ${MINGW32_PREFIX}gcc --version
    # i686-w64-mingw32-gcc (GCC) 6.1.0 20160427 (Mageia MinGW 6.1.0-1.mga6)

Troubleshooting
~~~~~~~~~~~~~~~

Cross-compiling from some Ubuntu versions may lead to
`this bug <https://github.com/godotengine/godot/issues/9258>`_,
due to a default configuration lacking support for POSIX threading.

You can change that configuration following those instructions,
for 64-bit::

    sudo update-alternatives --config x86_64-w64-mingw32-gcc
    <choose x86_64-w64-mingw32-gcc-posix from the list>
    sudo update-alternatives --config x86_64-w64-mingw32-g++
    <choose x86_64-w64-mingw32-g++-posix from the list>

And for 32-bit::

    sudo update-alternatives --config i686-w64-mingw32-gcc
    <choose i686-w64-mingw32-gcc-posix from the list>
    sudo update-alternatives --config i686-w64-mingw32-g++
    <choose i686-w64-mingw32-g++-posix from the list>

Creating Windows export templates
---------------------------------

Windows export templates are created by compiling Godot without the editor,
with the following flags::

    C:\godot> scons platform=windows target=template_debug arch=x86_32
    C:\godot> scons platform=windows target=template_release arch=x86_32
    C:\godot> scons platform=windows target=template_debug arch=x86_64
    C:\godot> scons platform=windows target=template_release arch=x86_64

If you plan on replacing the standard export templates, copy these to the
following location, replacing ``<version>`` with the version identifier
(such as ``3.1.1.stable`` or ``3.2.dev``)::

    %USERPROFILE%\AppData\Roaming\Godot\templates\<version>\

With the following names::

    windows_32_debug.exe
    windows_32_release.exe
    windows_64_debug.exe
    windows_64_release.exe

However, if you are using custom modules or custom engine code, you
may instead want to configure your binaries as custom export templates
here:

.. image:: img/wintemplates.png

You don't need to copy them in this case, just reference the resulting
files in the ``bin\`` directory of your Godot source folder, so the next
time you build, you will automatically have the custom templates referenced.