290 lines
9.8 KiB
Markdown
290 lines
9.8 KiB
Markdown
UNIX BUILD NOTES
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====================
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Some notes on how to build Bitcoin Core in Unix.
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(For BSD specific instructions, see `build-*bsd.md` in this directory.)
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Note
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---------------------
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Always use absolute paths to configure and compile Bitcoin Core and the dependencies,
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for example, when specifying the path of the dependency:
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../dist/configure --enable-cxx --disable-shared --with-pic --prefix=$BDB_PREFIX
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Here BDB_PREFIX must be an absolute path - it is defined using $(pwd) which ensures
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the usage of the absolute path.
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To Build
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---------------------
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```bash
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./autogen.sh
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./configure
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make
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make install # optional
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```
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This will build bitcoin-qt as well if the dependencies are met.
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Dependencies
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---------------------
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These dependencies are required:
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Library | Purpose | Description
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------------|------------------|----------------------
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libssl | Crypto | Random Number Generation, Elliptic Curve Cryptography
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libboost | Utility | Library for threading, data structures, etc
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libevent | Networking | OS independent asynchronous networking
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Optional dependencies:
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Library | Purpose | Description
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------------|------------------|----------------------
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miniupnpc | UPnP Support | Firewall-jumping support
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libdb4.8 | Berkeley DB | Wallet storage (only needed when wallet enabled)
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qt | GUI | GUI toolkit (only needed when GUI enabled)
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protobuf | Payments in GUI | Data interchange format used for payment protocol (only needed when GUI enabled)
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libqrencode | QR codes in GUI | Optional for generating QR codes (only needed when GUI enabled)
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univalue | Utility | JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
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libzmq3 | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.0.0)
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For the versions used, see [dependencies.md](dependencies.md)
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Memory Requirements
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--------------------
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C++ compilers are memory-hungry. It is recommended to have at least 1.5 GB of
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memory available when compiling Bitcoin Core. On systems with less, gcc can be
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tuned to conserve memory with additional CXXFLAGS:
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./configure CXXFLAGS="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"
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## Linux Distribution Specific Instructions
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### Ubuntu & Debian
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#### Dependency Build Instructions
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Build requirements:
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sudo apt-get install build-essential libtool autotools-dev automake pkg-config bsdmainutils python3
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Now, you can either build from self-compiled [depends](/depends/README.md) or install the required dependencies:
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sudo apt-get install libssl-dev libevent-dev libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev
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BerkeleyDB is required for the wallet.
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**For Ubuntu only:** db4.8 packages are available [here](https://launchpad.net/~bitcoin/+archive/bitcoin).
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You can add the repository and install using the following commands:
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sudo apt-get install software-properties-common
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sudo add-apt-repository ppa:bitcoin/bitcoin
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sudo apt-get update
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sudo apt-get install libdb4.8-dev libdb4.8++-dev
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Ubuntu and Debian have their own libdb-dev and libdb++-dev packages, but these will install
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BerkeleyDB 5.1 or later, which break binary wallet compatibility with the distributed executables which
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are based on BerkeleyDB 4.8. If you do not care about wallet compatibility,
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pass `--with-incompatible-bdb` to configure.
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See the section "Disable-wallet mode" to build Bitcoin Core without wallet.
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Optional (see --with-miniupnpc and --enable-upnp-default):
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sudo apt-get install libminiupnpc-dev
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ZMQ dependencies (provides ZMQ API):
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sudo apt-get install libzmq3-dev
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GUI dependencies:
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If you want to build bitcoin-qt, make sure that the required packages for Qt development
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are installed. Qt 5 is necessary to build the GUI.
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To build without GUI pass `--without-gui`.
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To build with Qt 5 you need the following:
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sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler
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libqrencode (optional) can be installed with:
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sudo apt-get install libqrencode-dev
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Once these are installed, they will be found by configure and a bitcoin-qt executable will be
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built by default.
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### Fedora
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#### Dependency Build Instructions
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Build requirements:
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sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
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Optional:
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sudo dnf install miniupnpc-devel
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To build with Qt 5 you need the following:
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sudo dnf install qt5-qttools-devel qt5-qtbase-devel protobuf-devel
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libqrencode (optional) can be installed with:
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sudo dnf install qrencode-devel
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Notes
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-----
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The release is built with GCC and then "strip bitcoind" to strip the debug
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symbols, which reduces the executable size by about 90%.
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miniupnpc
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---------
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[miniupnpc](http://miniupnp.free.fr/) may be used for UPnP port mapping. It can be downloaded from [here](
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http://miniupnp.tuxfamily.org/files/). UPnP support is compiled in and
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turned off by default. See the configure options for upnp behavior desired:
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--without-miniupnpc No UPnP support miniupnp not required
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--disable-upnp-default (the default) UPnP support turned off by default at runtime
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--enable-upnp-default UPnP support turned on by default at runtime
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Berkeley DB
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-----------
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It is recommended to use Berkeley DB 4.8. If you have to build it yourself,
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you can use [the installation script included in contrib/](/contrib/install_db4.sh)
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like so
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```shell
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./contrib/install_db4.sh `pwd`
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```
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from the root of the repository.
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**Note**: You only need Berkeley DB if the wallet is enabled (see the section *Disable-Wallet mode* below).
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Boost
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-----
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If you need to build Boost yourself:
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sudo su
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./bootstrap.sh
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./bjam install
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Security
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--------
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To help make your Bitcoin Core installation more secure by making certain attacks impossible to
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exploit even if a vulnerability is found, binaries are hardened by default.
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This can be disabled with:
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Hardening Flags:
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./configure --enable-hardening
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./configure --disable-hardening
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Hardening enables the following features:
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* Position Independent Executable
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Build position independent code to take advantage of Address Space Layout Randomization
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offered by some kernels. Attackers who can cause execution of code at an arbitrary memory
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location are thwarted if they don't know where anything useful is located.
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The stack and heap are randomly located by default, but this allows the code section to be
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randomly located as well.
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On an AMD64 processor where a library was not compiled with -fPIC, this will cause an error
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such as: "relocation R_X86_64_32 against `......' can not be used when making a shared object;"
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To test that you have built PIE executable, install scanelf, part of paxutils, and use:
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scanelf -e ./bitcoin
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The output should contain:
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TYPE
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ET_DYN
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* Non-executable Stack
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If the stack is executable then trivial stack-based buffer overflow exploits are possible if
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vulnerable buffers are found. By default, Bitcoin Core should be built with a non-executable stack,
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but if one of the libraries it uses asks for an executable stack or someone makes a mistake
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and uses a compiler extension which requires an executable stack, it will silently build an
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executable without the non-executable stack protection.
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To verify that the stack is non-executable after compiling use:
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`scanelf -e ./bitcoin`
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The output should contain:
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STK/REL/PTL
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RW- R-- RW-
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The STK RW- means that the stack is readable and writeable but not executable.
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Disable-wallet mode
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--------------------
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When the intention is to run only a P2P node without a wallet, Bitcoin Core may be compiled in
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disable-wallet mode with:
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./configure --disable-wallet
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In this case there is no dependency on Berkeley DB 4.8.
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Mining is also possible in disable-wallet mode using the `getblocktemplate` RPC call.
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Additional Configure Flags
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--------------------------
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A list of additional configure flags can be displayed with:
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./configure --help
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Setup and Build Example: Arch Linux
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-----------------------------------
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This example lists the steps necessary to setup and build a command line only, non-wallet distribution of the latest changes on Arch Linux:
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pacman -S git base-devel boost libevent python
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git clone https://github.com/bitcoin/bitcoin.git
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cd bitcoin/
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./autogen.sh
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./configure --disable-wallet --without-gui --without-miniupnpc
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make check
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Note:
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Enabling wallet support requires either compiling against a Berkeley DB newer than 4.8 (package `db`) using `--with-incompatible-bdb`,
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or building and depending on a local version of Berkeley DB 4.8. The readily available Arch Linux packages are currently built using
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`--with-incompatible-bdb` according to the [PKGBUILD](https://projects.archlinux.org/svntogit/community.git/tree/bitcoin/trunk/PKGBUILD).
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As mentioned above, when maintaining portability of the wallet between the standard Bitcoin Core distributions and independently built
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node software is desired, Berkeley DB 4.8 must be used.
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ARM Cross-compilation
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-------------------
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These steps can be performed on, for example, an Ubuntu VM. 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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Make sure you install the build requirements mentioned above.
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Then, install the toolchain and curl:
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sudo apt-get install g++-arm-linux-gnueabihf curl
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To build executables for ARM:
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cd depends
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make HOST=arm-linux-gnueabihf NO_QT=1
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cd ..
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./autogen.sh
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./configure --prefix=$PWD/depends/arm-linux-gnueabihf --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++
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make
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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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