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e29c6c8c61
Add update and upgrade commands to enable the installation of the first dependencies on ubuntu xenial. If those are not executed some packages can not be found.
178 lines
8.2 KiB
Markdown
178 lines
8.2 KiB
Markdown
WINDOWS BUILD NOTES
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====================
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Below are some notes on how to build Bitcoin Core for Windows.
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The options known to work for building Bitcoin Core on Windows are:
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* On Linux using the [Mingw-w64](https://mingw-w64.org/doku.php) cross compiler tool chain. Ubuntu Trusty 14.04 is recommended
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and is the platform used to build the Bitcoin Core Windows release binaries.
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* On Windows using [Windows
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Subsystem for Linux (WSL)](https://msdn.microsoft.com/commandline/wsl/about) and the Mingw-w64 cross compiler tool chain.
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Other options which may work but which have not been extensively tested are (please contribute instructions):
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* On Windows using a POSIX compatibility layer application such as [cygwin](http://www.cygwin.com/) or [msys2](http://www.msys2.org/).
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* On Windows using a native compiler tool chain such as [Visual Studio](https://www.visualstudio.com).
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Installing Windows Subsystem for Linux
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---------------------------------------
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With Windows 10, Microsoft has released a new feature named the [Windows
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Subsystem for Linux (WSL)](https://msdn.microsoft.com/commandline/wsl/about). This
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feature allows you to run a bash shell directly on Windows in an Ubuntu-based
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environment. Within this environment you can cross compile for Windows without
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the need for a separate Linux VM or server. Note that while WSL can be installed with
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other Linux variants, such as OpenSUSE, the following instructions have only been
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tested with Ubuntu.
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This feature is not supported in versions of Windows prior to Windows 10 or on
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Windows Server SKUs. In addition, it is available [only for 64-bit versions of
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Windows](https://msdn.microsoft.com/en-us/commandline/wsl/install_guide).
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Full instructions to install WSL are available on the above link.
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To install WSL on Windows 10 with Fall Creators Update installed (version >= 16215.0) do the following:
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1. Enable the Windows Subsystem for Linux feature
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* Open the Windows Features dialog (`OptionalFeatures.exe`)
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* Enable 'Windows Subsystem for Linux'
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* Click 'OK' and restart if necessary
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2. Install Ubuntu
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* Open Microsoft Store and search for Ubuntu or use [this link](https://www.microsoft.com/store/productId/9NBLGGH4MSV6)
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* Click Install
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3. Complete Installation
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* Open a cmd prompt and type "Ubuntu"
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* Create a new UNIX user account (this is a separate account from your Windows account)
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After the bash shell is active, you can follow the instructions below, starting
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with the "Cross-compilation" section. Compiling the 64-bit version is
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recommended but it is possible to compile the 32-bit version.
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Cross-compilation for Ubuntu and Windows Subsystem for Linux
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------------------------------------------------------------
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At the time of writing the Windows Subsystem for Linux installs Ubuntu Xenial 16.04. The Mingw-w64 package
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for Ubuntu Xenial does not produce working executables for some of the Bitcoin Core applications.
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It is possible to build on Ubuntu Xenial by installing the cross compiler packages from Ubuntu Zesty, see the steps below.
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Building on Ubuntu Zesty 17.04 up to 17.10 has been verified to work.
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The steps below can be performed on Ubuntu (including in a VM) or WSL. The depends system
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will also work on other Linux distributions, however the commands for
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installing the toolchain will be different.
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First, install the general dependencies:
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sudo apt update
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sudo apt upgrade
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sudo apt install build-essential libtool autotools-dev automake pkg-config bsdmainutils curl git
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A host toolchain (`build-essential`) is necessary because some dependency
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packages (such as `protobuf`) need to build host utilities that are used in the
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build process.
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See also: [dependencies.md](dependencies.md).
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## Building for 64-bit Windows
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The first step is to install the mingw-w64 cross-compilation tool chain. Due to different Ubuntu
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packages for each distribution and problems with the Xenial packages the steps for each are different.
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Common steps to install mingw32 cross compiler tool chain:
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sudo apt install g++-mingw-w64-x86-64
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Ubuntu Trusty 14.04:
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No further steps required
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Ubuntu Xenial 16.04 and Windows Subsystem for Linux <sup>[1](#footnote1),[2](#footnote2)</sup>:
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sudo apt install software-properties-common
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sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu zesty universe"
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sudo apt update
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sudo apt upgrade
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sudo update-alternatives --config x86_64-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
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Ubuntu Zesty 17.04 <sup>[2](#footnote2)</sup>:
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sudo update-alternatives --config x86_64-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
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Once the tool chain is installed the build steps are common:
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Note that for WSL the Bitcoin Core source path MUST be somewhere in the default mount file system, for
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example /usr/src/bitcoin, AND not under /mnt/d/. If this is not the case the dependency autoconf scripts will fail.
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This means you cannot use a directory that located directly on the host Windows file system to perform the build.
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Acquire the source in the usual way:
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git clone https://github.com/bitcoin/bitcoin.git
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Once the source code is ready the build steps are below.
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PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
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cd depends
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make HOST=x86_64-w64-mingw32
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cd ..
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./autogen.sh # not required when building from tarball
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CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure --prefix=/
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make
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## Building for 32-bit Windows
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To build executables for Windows 32-bit, install the following dependencies:
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sudo apt install g++-mingw-w64-i686 mingw-w64-i686-dev
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For Ubuntu Xenial 16.04, Ubuntu Zesty 17.04 and Windows Subsystem for Linux <sup>[2](#footnote2)</sup>:
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sudo update-alternatives --config i686-w64-mingw32-g++ # Set the default mingw32 g++ compiler option to posix.
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Note that for WSL the Bitcoin Core source path MUST be somewhere in the default mount file system, for
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example /usr/src/bitcoin, AND not under /mnt/d/. If this is not the case the dependency autoconf scripts will fail.
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This means you cannot use a directory that located directly on the host Windows file system to perform the build.
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Acquire the source in the usual way:
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git clone https://github.com/bitcoin/bitcoin.git
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Then build using:
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PATH=$(echo "$PATH" | sed -e 's/:\/mnt.*//g') # strip out problematic Windows %PATH% imported var
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cd depends
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make HOST=i686-w64-mingw32
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cd ..
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./autogen.sh # not required when building from tarball
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CONFIG_SITE=$PWD/depends/i686-w64-mingw32/share/config.site ./configure --prefix=/
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make
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## Depends system
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For further documentation on the depends system see [README.md](../depends/README.md) in the depends directory.
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Installation
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-------------
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After building using the Windows subsystem it can be useful to copy the compiled
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executables to a directory on the windows drive in the same directory structure
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as they appear in the release `.zip` archive. This can be done in the following
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way. This will install to `c:\workspace\bitcoin`, for example:
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make install DESTDIR=/mnt/c/workspace/bitcoin
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Footnotes
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---------
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<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
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causes two of the bitcoin executables to crash shortly after start up. The bug is related to the
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-fstack-protector-all g++ compiler flag which is used to mitigate buffer overflows.
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Installing the Mingw-w64 packages from the Ubuntu 17 distribution solves the issue, however, this is not
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an officially supported approach and it's only recommended if you are prepared to reinstall WSL/Ubuntu should
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something break.
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<a name="footnote2">2</a>: Starting from Ubuntu Xenial 16.04 both the 32 and 64 bit Mingw-w64 packages install two different
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compiler options to allow a choice between either posix or win32 threads. The default option is win32 threads which is the more
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efficient since it will result in binary code that links directly with the Windows kernel32.lib. Unfortunately, the headers
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required to support win32 threads conflict with some of the classes in the C++11 standard library in particular std::mutex.
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It's not possible to build the bitcoin code using the win32 version of the Mingw-w64 cross compilers (at least not without
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modifying headers in the bitcoin source code).
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