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doc: shuffle depends instructions
Native compilation is explained before cross-compilation. Move install and (g)make steps up. In the Configuring section, use Linux native compilation as the example instead of Windows cross-compile.
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‎depends/README.md‎

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### Usage
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# Depends build
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This is a system of building and caching dependencies necessary for building
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Bitcoin Core. It supports cross-compilation. For more details see [description.md](description.md),
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as well as [packages.md](packages.md) for how to add packages.
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## Usage
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### Ubuntu & Debian
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apt install cmake curl make patch
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Skip the following packages if you don't intend to use the GUI and will build with [`NO_QT=1`](#dependency-options):
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apt install bison g++ ninja-build pkgconf python3 xz-utils
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To build dependencies for the current arch+OS:
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make
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To build for another arch/OS:
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### FreeBSD
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make HOST=host-platform-triplet
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pkg install bash
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For example:
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To build dependencies for the current arch+OS:
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make HOST=x86_64-w64-mingw32 -j4
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make
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### NetBSD
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pkgin install bash gmake
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To build dependencies for the current arch+OS:
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gmake
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### OpenBSD
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pkg_add bash gmake gtar
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To build dependencies for the current arch+OS:
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gmake
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## Configuring Bitcoin Core
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**When configuring Bitcoin Core, CMake by default will ignore the depends output.** In
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order for it to pick up libraries, tools, and settings from the depends build,
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you must specify the toolchain file.
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In the above example, a file named `depends/x86_64-w64-mingw32/toolchain.cmake` will be
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In the above example for Ubuntu, a file named `depends/x86_64-pc-linux-gnu/toolchain.cmake` will be
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created. To use it during configuring Bitcoin Core:
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cmake -B build --toolchain depends/x86_64-w64-mingw32/toolchain.cmake
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cmake -B build --toolchain depends/x86_64-pc-linux-gnu/toolchain.cmake
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## Dependency Options
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The following can be set when running make: `make FOO=bar`
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- `SOURCES_PATH`: Downloaded sources will be placed here
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- `BASE_CACHE`: Built packages will be placed here
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- `SDK_PATH`: Path where SDKs can be found (used by macOS)
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- `FALLBACK_DOWNLOAD_PATH`: If a source file can't be fetched, try here before giving up
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- `C_STANDARD`: Set the C standard version used. Defaults to `c11`.
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- `CXX_STANDARD`: Set the C++ standard version used. Defaults to `c++20`.
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- `NO_BOOST`: Don't download/build/cache Boost
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- `NO_LIBEVENT`: Don't download/build/cache Libevent
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- `NO_QT`: Don't download/build/cache Qt and its dependencies
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- `NO_QR`: Don't download/build/cache packages needed for enabling qrencode
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- `NO_ZMQ`: Don't download/build/cache packages needed for enabling ZeroMQ
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- `NO_WALLET`: Don't download/build/cache libs needed to enable the wallet (SQLite)
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- `NO_BDB`: Don't download/build/cache BerkeleyDB
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- `NO_USDT`: Don't download/build/cache packages needed for enabling USDT tracepoints
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- `MULTIPROCESS`: Build libmultiprocess (experimental)
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- `DEBUG`: Disable some optimizations and enable more runtime checking
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- `HOST_ID_SALT`: Optional salt to use when generating host package ids
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- `BUILD_ID_SALT`: Optional salt to use when generating build package ids
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- `LOG`: Use file-based logging for individual packages. During a package build its log file
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resides in the `depends` directory, and the log file is printed out automatically in case
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of build error. After successful build log files are moved along with package archives
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- `LTO`: Enable options needed for LTO. Does not add `-flto` related options to *FLAGS.
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If some packages are not built, for example `make NO_WALLET=1`, the appropriate CMake cache
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variables will be set when generating the Bitcoin Core buildsystem. In this case, `-DENABLE_WALLET=OFF`.
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## Cross compilation
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To build for another arch/OS:
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make HOST=host-platform-triplet
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For example:
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make HOST=x86_64-w64-mingw32 -j4
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Common `host-platform-triplet`s for cross compilation are:
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The paths are automatically configured and no other options are needed.
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### Install the required dependencies: Ubuntu & Debian
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#### Common
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apt install cmake curl make patch
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#### GUI
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Skip the following packages if you don't intend to use the GUI and will build with [`NO_QT=1`](#dependency-options):
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apt install bison g++ ninja-build pkgconf python3 xz-utils
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#### For macOS cross compilation
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apt install clang lld llvm zip
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sudo apt-get install g++-s390x-linux-gnu binutils-s390x-linux-gnu
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### Install the required dependencies: FreeBSD
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pkg install bash
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### Install the required dependencies: NetBSD
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pkgin install bash gmake
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### Install the required dependencies: OpenBSD
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pkg_add bash gmake gtar
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### Dependency Options
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The following can be set when running make: `make FOO=bar`
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- `SOURCES_PATH`: Downloaded sources will be placed here
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- `BASE_CACHE`: Built packages will be placed here
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- `SDK_PATH`: Path where SDKs can be found (used by macOS)
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- `FALLBACK_DOWNLOAD_PATH`: If a source file can't be fetched, try here before giving up
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- `C_STANDARD`: Set the C standard version used. Defaults to `c11`.
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- `CXX_STANDARD`: Set the C++ standard version used. Defaults to `c++20`.
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- `NO_BOOST`: Don't download/build/cache Boost
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- `NO_LIBEVENT`: Don't download/build/cache Libevent
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- `NO_QT`: Don't download/build/cache Qt and its dependencies
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- `NO_QR`: Don't download/build/cache packages needed for enabling qrencode
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- `NO_ZMQ`: Don't download/build/cache packages needed for enabling ZeroMQ
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- `NO_WALLET`: Don't download/build/cache libs needed to enable the wallet (SQLite)
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- `NO_BDB`: Don't download/build/cache BerkeleyDB
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- `NO_USDT`: Don't download/build/cache packages needed for enabling USDT tracepoints
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- `MULTIPROCESS`: Build libmultiprocess (experimental)
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- `DEBUG`: Disable some optimizations and enable more runtime checking
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- `HOST_ID_SALT`: Optional salt to use when generating host package ids
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- `BUILD_ID_SALT`: Optional salt to use when generating build package ids
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- `LOG`: Use file-based logging for individual packages. During a package build its log file
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resides in the `depends` directory, and the log file is printed out automatically in case
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of build error. After successful build log files are moved along with package archives
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- `LTO`: Enable options needed for LTO. Does not add `-flto` related options to *FLAGS.
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If some packages are not built, for example `make NO_WALLET=1`, the appropriate CMake cache
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variables will be set when generating the Bitcoin Core buildsystem. In this case, `-DENABLE_WALLET=OFF`.
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### Additional targets
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download: run 'make download' to fetch all sources without building them
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download-osx: run 'make download-osx' to fetch all sources needed for macOS builds
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download-win: run 'make download-win' to fetch all sources needed for win builds
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download-linux: run 'make download-linux' to fetch all sources needed for linux builds
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### Other documentation
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- [description.md](description.md): General description of the depends system
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- [packages.md](packages.md): Steps for adding packages

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