4 Below are some notes on how to build Bitcoin Core for Windows.
6 The options known to work for building Bitcoin Core on Windows are:
8 * On Linux using the [Mingw-w64](https://mingw-w64.org/doku.php) cross compiler tool chain. Ubuntu Trusty 14.04 is recommended
9 and is the platform used to build the Bitcoin Core Windows release binaries.
10 * On Windows using [Windows
11 Subsystem for Linux (WSL)](https://msdn.microsoft.com/commandline/wsl/about) and the Mingw-w64 cross compiler tool chain.
13 Other options which may work but which have not been extensively tested are (please contribute instructions):
15 * On Windows using a POSIX compatibility layer application such as [cygwin](http://www.cygwin.com/) or [msys2](http://www.msys2.org/).
16 * On Windows using a native compiler tool chain such as [Visual Studio](https://www.visualstudio.com).
18 Installing Windows Subsystem for Linux
19 ---------------------------------------
21 With Windows 10, Microsoft has released a new feature named the [Windows
22 Subsystem for Linux (WSL)](https://msdn.microsoft.com/commandline/wsl/about). This
23 feature allows you to run a bash shell directly on Windows in an Ubuntu-based
24 environment. Within this environment you can cross compile for Windows without
25 the need for a separate Linux VM or server. Note that while WSL can be installed with
26 other Linux variants, such as OpenSUSE, the following instructions have only been
29 This feature is not supported in versions of Windows prior to Windows 10 or on
30 Windows Server SKUs. In addition, it is available [only for 64-bit versions of
31 Windows](https://msdn.microsoft.com/en-us/commandline/wsl/install_guide).
33 Full instructions to install WSL are available on the above link.
34 To install WSL on Windows 10 with Fall Creators Update installed (version >= 16215.0) do the following:
36 1. Enable the Windows Subsystem for Linux feature
37 * From Start, search for "Turn Windows features on or off" (type 'turn')
38 * Select Windows Subsystem for Linux
40 * Restart if necessary
42 * Open Microsoft Store and search for Ubuntu or use [this link](https://www.microsoft.com/store/productId/9NBLGGH4MSV6)
44 3. Complete Installation
45 * Open a cmd prompt and type "Ubuntu"
46 * Create a new UNIX user account (this is a separate account from your Windows account)
48 After the bash shell is active, you can follow the instructions below, starting
49 with the "Cross-compilation" section. Compiling the 64-bit version is
50 recommended but it is possible to compile the 32-bit version.
52 Cross-compilation for Ubuntu and Windows Subsystem for Linux
53 ------------------------------------------------------------
55 At the time of writing the Windows Subsystem for Linux installs Ubuntu Xenial 16.04. The Mingw-w64 package
56 for Ubuntu Xenial does not produce working executables for some of the Bitcoin Core applications.
57 It is possible to build on Ubuntu Xenial by installing the cross compiler packages from Ubuntu Zesty, see the steps below.
58 Building on Ubuntu Zesty 17.04 up to 17.10 has been verified to work.
60 The steps below can be performed on Ubuntu (including in a VM) or WSL. The depends system
61 will also work on other Linux distributions, however the commands for
62 installing the toolchain will be different.
64 First, install the general dependencies:
66 sudo apt install build-essential libtool autotools-dev automake pkg-config bsdmainutils curl git
68 A host toolchain (`build-essential`) is necessary because some dependency
69 packages (such as `protobuf`) need to build host utilities that are used in the
72 See also: [dependencies.md](dependencies.md).
74 ## Building for 64-bit Windows
76 The first step is to install the mingw-w64 cross-compilation tool chain. Due to different Ubuntu
77 packages for each distribution and problems with the Xenial packages the steps for each are different.
79 Common steps to install mingw32 cross compiler tool chain:
81 sudo apt install g++-mingw-w64-x86-64
85 No further steps required
87 Ubuntu Xenial 16.04 and Windows Subsystem for Linux <sup>[1](#footnote1),[2](#footnote2)</sup>:
89 sudo apt install software-properties-common
90 sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu zesty universe"
93 sudo update-alternatives --config x86_64-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
95 Ubuntu Zesty 17.04 <sup>[2](#footnote2)</sup>:
97 sudo update-alternatives --config x86_64-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
99 Once the tool chain is installed the build steps are common:
101 Note that for WSL the Bitcoin Core source path MUST be somewhere in the default mount file system, for
102 example /usr/src/bitcoin, AND not under /mnt/d/. If this is not the case the dependency autoconf scripts will fail.
103 This means you cannot use a directory that located directly on the host Windows file system to perform the build.
105 The next three steps are an example of how to acquire the source in an appropriate way.
108 sudo git clone https://github.com/bitcoin/bitcoin.git
109 sudo chmod -R a+rw bitcoin
111 Once the source code is ready the build steps are below.
113 PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
115 make HOST=x86_64-w64-mingw32
117 ./autogen.sh # not required when building from tarball
118 CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure --prefix=/
121 ## Building for 32-bit Windows
123 To build executables for Windows 32-bit, install the following dependencies:
125 sudo apt install g++-mingw-w64-i686 mingw-w64-i686-dev
127 For Ubuntu Xenial 16.04, Ubuntu Zesty 17.04 and Windows Subsystem for Linux <sup>[2](#footnote2)</sup>:
129 sudo update-alternatives --config i686-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
131 Note that for WSL the Bitcoin Core source path MUST be somewhere in the default mount file system, for
132 example /usr/src/bitcoin, AND not under /mnt/d/. If this is not the case the dependency autoconf scripts will fail.
133 This means you cannot use a directory that located directly on the host Windows file system to perform the build.
135 The next three steps are an example of how to acquire the source in an appropriate way.
138 sudo git clone https://github.com/bitcoin/bitcoin.git
139 sudo chmod -R a+rw bitcoin
143 PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
145 make HOST=i686-w64-mingw32
147 ./autogen.sh # not required when building from tarball
148 CONFIG_SITE=$PWD/depends/i686-w64-mingw32/share/config.site ./configure --prefix=/
153 For further documentation on the depends system see [README.md](../depends/README.md) in the depends directory.
158 After building using the Windows subsystem it can be useful to copy the compiled
159 executables to a directory on the windows drive in the same directory structure
160 as they appear in the release `.zip` archive. This can be done in the following
161 way. This will install to `c:\workspace\bitcoin`, for example:
163 make install DESTDIR=/mnt/c/workspace/bitcoin
168 <a name="footnote1">1</a>: There is currently a bug in the 64 bit Mingw-w64 cross compiler packaged for WSL/Ubuntu Xenial 16.04 that
169 causes two of the bitcoin executables to crash shortly after start up. The bug is related to the
170 -fstack-protector-all g++ compiler flag which is used to mitigate buffer overflows.
171 Installing the Mingw-w64 packages from the Ubuntu 17 distribution solves the issue, however, this is not
172 an officially supported approach and it's only recommended if you are prepared to reinstall WSL/Ubuntu should
175 <a name="footnote2">2</a>: Starting from Ubuntu Xenial 16.04 both the 32 and 64 bit Mingw-w64 packages install two different
176 compiler options to allow a choice between either posix or win32 threads. The default option is win32 threads which is the more
177 efficient since it will result in binary code that links directly with the Windows kernel32.lib. Unfortunately, the headers
178 required to support win32 threads conflict with some of the classes in the C++11 standard library in particular std::mutex.
179 It's not possible to build the bitcoin code using the win32 version of the Mingw-w64 cross compilers (at least not without
180 modifying headers in the bitcoin source code).