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merge-script 2b541eeb36 Merge bitcoin/bitcoin#34495: Replace boost signals with minimal compatible implementation 
242b0ebb5c btcsignals: use a single shared_ptr for liveness and callback (Cory Fields)
b12f43a0a8 signals: remove boost::signals2 from depends and vcpkg (Cory Fields)
a4b1607983 signals: remove boost::signals2 mentions in linters and docs (Cory Fields)
375397ebd9 signals: remove boost includes where possible (Cory Fields)
091736a153 signals: re-add forward-declares to interface headers (Cory Fields)
9958f4fe49 Revert "signals: Temporarily add boost headers to bitcoind and bitcoin-node builds" (Cory Fields)
34eabd77a2 signals: remove boost compatibility guards (Cory Fields)
e60a0b9a22 signals: Add a simplified boost-compatible implementation (Cory Fields)
63c68e2a3f signals: add signals tests (Cory Fields)
edc2978058 signals: use an alias for the boost::signals2 namespace (Cory Fields)
9ade3929aa signals: remove forward-declare for signals (Cory Fields)
037e58b57b signals: use forwarding header for boost signals (Cory Fields)
2150153f37 signals: Temporarily add boost headers to bitcoind and bitcoin-node builds (Cory Fields)
fd5e9d9904 signals: Use a lambda to avoid connecting a signal to another signal (Cory Fields)

Pull request description:

  This drops our dependency on `boost::signals2`, leaving `boost::multi_index` as the only remaining boost dependency for bitcoind.

  `boost::signals2` is a complex beast, but we only use a small portion of it. Namely: it's a way for multiple subscribers to connect to the same event, and the ability to later disconnect individual subscribers from that event.

  `btcsignals` adheres to the subset of the `boost::signals2` API that we currently use, and thus is a drop-in replacement. Rather than implementing a complex `slot` tracking class that we never used anyway (and which was much more useful in the days before std::function existed), callbacks are simply wrapped directly in `std::function`s.

  The new tests work with either `boost::signals2` or the new `btcsignals` implementation. Reviewers can verify
  functional equivalency by running the tests in the commit that introduces them against `boost::signals2`, then again with `btcsignals`.

  The majority of the commits in this PR are preparation and cleanup. Once `boost::signals2` is no longer needed, it is removed from depends. Additionally, a few CMake targets no longer need boost includes as they were previously only required for signals.

  I think this is actually pretty straightforward to review. I kept things simple, including keeping types unmovable/uncopyable where possible rather than trying to define those semantics. In doing so, the new implementation has even fewer type requirements than boost, which I believe is due to a boost bug. I've opened a PR upstream for that to attempt to maintain parity between the implementations.

  See individual commits for more details.

  Closes #26442.

ACKs for top commit:
  fjahr:
    Code review ACK 242b0ebb5c
  maflcko:
    re-review ACK 242b0ebb5c 🎯
  w0xlt:
    reACK 242b0ebb5c

Tree-SHA512: 9a472afa4f655624fa44493774a63b57509ad30fb61bf1d89b6d0b52000cb9a1409a5b8d515a99c76e0b26b2437c30508206c29a7dd44ea96eb1979d572cd4d4
2026-04-09 16:25:47 +08:00
..
builders
depends: FreeBSD cross with Clang
2026-03-24 10:57:27 +08:00
hosts
depends: FreeBSD cross with Clang
2026-03-24 10:57:27 +08:00
packages
Merge bitcoin/bitcoin#34495: Replace boost signals with minimal compatible implementation
2026-04-09 16:25:47 +08:00
patches
depends, qt: Fix build on aarch64 macOS 26.4
2026-03-30 14:41:29 +01:00
.gitignore
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config.guess
depends: latest config.guess
2025-11-25 16:29:23 +00:00
config.sub
depends: latest config.sub
2025-11-25 16:29:23 +00:00
description.md
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funcs.mk
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gen_id
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Makefile
depends: Do not consider CC environment variable when detecting system
2026-01-20 17:49:46 +00:00
packages.md
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README.md
doc: document depends compiler configuration
2026-03-11 12:02:24 +00:00
toolchain.cmake.in
depends: Prefix include path for headers-only systemtap package
2026-02-05 13:46:20 +00:00

README.md

Depends build

This is a system of building and caching dependencies necessary for building Bitcoin Core. It supports cross-compilation. For more details see description.md, as well as packages.md for how to add packages.

Usage

Ubuntu & Debian

apt install cmake curl make patch

Skip the following packages if you don't intend to use the GUI and will build with NO_QT=1:

apt install bison g++ ninja-build pkgconf python3 xz-utils

To build dependencies for the current arch+OS:

make

macOS

Install Xcode Command Line Tools and Homebrew Package Manager, see build-osx.md.

brew install cmake make ninja

To build dependencies for the current arch+OS:

gmake

FreeBSD

pkg install bash cmake curl gmake

Skip the following packages if you don't intend to use the GUI and will build with NO_QT=1:

pkg install bison ninja pkgconf python3

To build dependencies for the current arch+OS:

gmake

NetBSD

pkgin install bash cmake curl gmake perl

To build dependencies for the current arch+OS:

gmake

OpenBSD

pkg_add bash cmake curl gmake gtar

To build dependencies for the current arch+OS:

gmake

Alpine

apk add bash build-base cmake curl make patch

Skip the following packages if you don't intend to use the GUI and will build with NO_QT=1:

apk add bison linux-headers samurai pkgconf python3

To build dependencies for the current arch+OS:

make

Configuring Bitcoin Core

When configuring Bitcoin Core, CMake by default will ignore the depends output. In order for it to pick up libraries, tools, and settings from the depends build, you must specify the toolchain file. In the above example for Ubuntu, a file named depends/x86_64-pc-linux-gnu/toolchain.cmake will be created. To use it during configuring Bitcoin Core:

cmake -B build --toolchain depends/x86_64-pc-linux-gnu/toolchain.cmake

Dependency Options

The following can be set when running make: make FOO=bar

  • SOURCES_PATH: Downloaded sources will be placed here
  • BASE_CACHE: Built packages will be placed here
  • SDK_PATH: Path where SDKs can be found (used by macOS)
  • FALLBACK_DOWNLOAD_PATH: If a source file can't be fetched, try here before giving up
  • C_STANDARD: Set the C standard version used. Defaults to c11.
  • CXX_STANDARD: Set the C++ standard version used. Defaults to c++20.
  • NO_BOOST: Don't download/build/cache Boost
  • NO_LIBEVENT: Don't download/build/cache Libevent
  • NO_QT: Don't download/build/cache Qt and its dependencies
  • NO_QR: Don't download/build/cache packages needed for enabling qrencode
  • NO_ZMQ: Don't download/build/cache packages needed for enabling ZeroMQ
  • NO_WALLET: Don't download/build/cache libs needed to enable the wallet (SQLite)
  • NO_USDT: Don't download/build/cache packages needed for enabling USDT tracepoints
  • NO_IPC: Don't build Cap’n Proto and libmultiprocess packages. Default on Windows.
  • DEBUG: Disable some optimizations and enable more runtime checking
  • HOST_ID_SALT: Optional salt to use when generating host package ids
  • BUILD_ID_SALT: Optional salt to use when generating build package ids
  • LOG: Use file-based logging for individual packages. During a package build its log file resides in the depends directory, and the log file is printed out automatically in case of build error. After successful build log files are moved along with package archives
  • LTO: Enable options needed for LTO. Does not add -flto related options to *FLAGS.

If some packages are not built, for example make NO_WALLET=1, the appropriate CMake cache variables will be set when generating the Bitcoin Core buildsystem. In this case, -DENABLE_WALLET=OFF.

Compiler Configuration

CC and CXX control target compilers. build_CC and build_CXX control compilers for native build tools (e.g. native_capnp, native_qt), which default to gcc/g++ on Linux and clang/clang++ on macOS/FreeBSD/OpenBSD (see ./depends/builders/*.mk).

On a system where the default build compiler is not available (e.g. Linux without gcc/g++), you could use the following to build all packages using clang:

make -C depends build_CC=clang build_CXX=clang++ CC=clang CXX=clang++

Cross compilation

To build for another arch/OS:

make HOST=host-platform-triplet

For example:

make HOST=x86_64-w64-mingw32 -j4

Common host-platform-triplets for cross compilation are:

  • i686-pc-linux-gnu for Linux x86 32 bit
  • x86_64-pc-linux-gnu for Linux x86 64 bit
  • x86_64-w64-mingw32 for Windows using MSVCRT
  • x86_64-w64-mingw32ucrt for Windows using UCRT
  • x86_64-apple-darwin for Intel macOS
  • arm64-apple-darwin for ARM macOS
  • arm-linux-gnueabihf for Linux ARM 32 bit
  • aarch64-linux-gnu for Linux ARM 64 bit
  • powerpc64-linux-gnu for Linux POWER 64 bit (big endian)
  • powerpc64le-linux-gnu for Linux POWER 64 bit (little endian)
  • riscv32-linux-gnu for Linux RISC-V 32 bit
  • riscv64-linux-gnu for Linux RISC-V 64 bit
  • s390x-linux-gnu for Linux S390X

The paths are automatically configured and no other options are needed.

For macOS cross compilation

apt install clang lld llvm zip

Clang 18 or later is required. You must also obtain the macOS SDK before proceeding with a cross-compile. Under the depends directory, create a subdirectory named SDKs. Then, place the extracted SDK under this new directory. For more information, see SDK Extraction.

For Windows cross compilation using MSVCRT

apt install g++-mingw-w64-x86-64-posix

For Windows cross compilation using UCRT

apt install g++-mingw-w64-ucrt64

For linux (including i386, ARM) cross compilation

Common linux dependencies:

sudo apt-get install g++-multilib binutils

For linux ARM cross compilation:

sudo apt-get install g++-arm-linux-gnueabihf binutils-arm-linux-gnueabihf

For linux AARCH64 cross compilation:

sudo apt-get install g++-aarch64-linux-gnu binutils-aarch64-linux-gnu

For linux POWER 64-bit cross compilation (there are no packages for 32-bit):

sudo apt-get install g++-powerpc64-linux-gnu binutils-powerpc64-linux-gnu g++-powerpc64le-linux-gnu binutils-powerpc64le-linux-gnu

For linux RISC-V 64-bit cross compilation (there are no packages for 32-bit):

sudo apt-get install g++-riscv64-linux-gnu binutils-riscv64-linux-gnu

For linux S390X cross compilation:

sudo apt-get install g++-s390x-linux-gnu binutils-s390x-linux-gnu

Additional targets

download: run 'make download' to fetch all sources without building them
download-osx: run 'make download-osx' to fetch all sources needed for macOS builds
download-win: run 'make download-win' to fetch all sources needed for win builds
download-linux: run 'make download-linux' to fetch all sources needed for linux builds
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