# Copyright (c) 2023-present The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/.

# Ubuntu 22.04 LTS Jammy Jellyfish, https://wiki.ubuntu.com/Releases, EOSS in June 2027:
#  - CMake 3.22.1, https://packages.ubuntu.com/jammy/cmake
#
# Centos Stream 9, EOL in May 2027:
#  - CMake 3.26.5, https://mirror.stream.centos.org/9-stream/AppStream/x86_64/os/Packages/
cmake_minimum_required(VERSION 3.22)
if(POLICY CMP0141)
  # MSVC debug information format flags are selected by an abstraction.
  # We want to use the CMAKE_MSVC_DEBUG_INFORMATION_FORMAT variable
  # to select the MSVC debug information format.
  cmake_policy(SET CMP0141 NEW)
endif()

if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
  message(FATAL_ERROR "In-source builds are not allowed.")
endif()

#=============================
# Project / Package metadata
#=============================
set(PACKAGE_NAME "Bitcoin Core")
set(CLIENT_VERSION_MAJOR 27)
set(CLIENT_VERSION_MINOR 99)
set(CLIENT_VERSION_BUILD 0)
set(CLIENT_VERSION_RC 0)
set(CLIENT_VERSION_IS_RELEASE "false")
set(COPYRIGHT_YEAR "2024")

project(BitcoinCore
  VERSION ${CLIENT_VERSION_MAJOR}.${CLIENT_VERSION_MINOR}.${CLIENT_VERSION_BUILD}
  DESCRIPTION "Bitcoin client software"
  HOMEPAGE_URL "https://bitcoincore.org/"
  LANGUAGES NONE
)

set(PACKAGE_VERSION ${PROJECT_VERSION})
if(CLIENT_VERSION_RC GREATER 0)
  string(APPEND PACKAGE_VERSION "rc${CLIENT_VERSION_RC}")
endif()

set(COPYRIGHT_HOLDERS "The %s developers")
set(COPYRIGHT_HOLDERS_FINAL "The ${PACKAGE_NAME} developers")
set(PACKAGE_BUGREPORT "https://github.com/bitcoin/bitcoin/issues")

#=============================
# Language setup
#=============================
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND NOT CMAKE_HOST_APPLE)
  # We do not use the install_name_tool when cross-compiling for macOS.
  # So disable this tool check in further enable_language() commands.
  set(CMAKE_PLATFORM_HAS_INSTALLNAME FALSE)
endif()
enable_language(CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/module)

#=============================
# Configurable options
#=============================
include(CMakeDependentOption)
# When adding a new option, end the <help_text> with a full stop for consistency.
option(BUILD_DAEMON "Build bitcoind executable." ON)
option(BUILD_GUI "Build bitcoin-qt executable." OFF)
option(BUILD_CLI "Build bitcoin-cli executable." ON)

option(BUILD_TESTS "Build test_bitcoin executable." ON)
option(BUILD_TX "Build bitcoin-tx executable." ${BUILD_TESTS})
option(BUILD_UTIL "Build bitcoin-util executable." ${BUILD_TESTS})

option(ENABLE_WALLET "Enable wallet." ON)
option(WITH_SQLITE "Enable SQLite wallet support." ${ENABLE_WALLET})
if(WITH_SQLITE)
  if(VCPKG_TARGET_TRIPLET)
    # Use of the `unofficial::` namespace is a vcpkg package manager convention.
    find_package(unofficial-sqlite3 CONFIG REQUIRED)
  else()
    find_package(SQLite3 3.7.17 REQUIRED)
  endif()
  set(USE_SQLITE ON)
  set(ENABLE_WALLET ON)
endif()
option(WITH_BDB "Enable Berkeley DB (BDB) wallet support." OFF)
cmake_dependent_option(WARN_INCOMPATIBLE_BDB "Warn when using a Berkeley DB (BDB) version other than 4.8." ON "WITH_BDB" OFF)
if(WITH_BDB)
  find_package(BerkeleyDB 4.8 MODULE REQUIRED)
  set(USE_BDB ON)
  set(ENABLE_WALLET ON)
  if(NOT BerkeleyDB_VERSION VERSION_EQUAL 4.8)
    message(WARNING "Found Berkeley DB (BDB) other than 4.8.\n"
                    "BDB (legacy) wallets opened by this build will not be portable!"
    )
    if(WARN_INCOMPATIBLE_BDB)
      message(WARNING "If this is intended, pass \"-DWARN_INCOMPATIBLE_BDB=OFF\".\n"
                      "Passing \"-DWITH_BDB=OFF\" will suppress this warning."
      )
    endif()
  endif()
endif()
cmake_dependent_option(BUILD_WALLET_TOOL "Build bitcoin-wallet tool." ${BUILD_TESTS} "ENABLE_WALLET" OFF)

option(ENABLE_HARDENING "Attempt to harden the resulting executables." ON)
option(REDUCE_EXPORTS "Attempt to reduce exported symbols in the resulting executables." OFF)
option(WERROR "Treat compiler warnings as errors." OFF)
option(WITH_CCACHE "Attempt to use ccache for compiling." ON)

option(WITH_NATPMP "Enable NAT-PMP." OFF)
if(WITH_NATPMP)
  find_package(NATPMP MODULE REQUIRED)
endif()

option(WITH_MINIUPNPC "Enable UPnP." OFF)
if(WITH_MINIUPNPC)
  find_package(MiniUPnPc MODULE REQUIRED)
endif()

option(WITH_ZMQ "Enable ZMQ notifications." OFF)
if(WITH_ZMQ)
  if(VCPKG_TARGET_TRIPLET)
    find_package(ZeroMQ CONFIG REQUIRED)
  else()
    # The ZeroMQ project has provided config files since v4.2.2.
    # TODO: Switch to find_package(ZeroMQ) at some point in the future.
    find_package(PkgConfig REQUIRED)
    pkg_check_modules(libzmq REQUIRED IMPORTED_TARGET libzmq>=4)
    # TODO: This command will be redundant once
    #       https://github.com/bitcoin/bitcoin/pull/30508 is merged.
    target_link_libraries(PkgConfig::libzmq INTERFACE
      $<$<PLATFORM_ID:Windows>:iphlpapi;ws2_32>
    )
  endif()
endif()

option(WITH_USDT "Enable tracepoints for Userspace, Statically Defined Tracing." OFF)
if(WITH_USDT)
  find_package(USDT MODULE REQUIRED)
endif()

cmake_dependent_option(ENABLE_EXTERNAL_SIGNER "Enable external signer support." ON "NOT WIN32" OFF)

cmake_dependent_option(WITH_QRENCODE "Enable QR code support." ON "BUILD_GUI" OFF)
if(WITH_QRENCODE)
  find_package(PkgConfig REQUIRED)
  pkg_check_modules(libqrencode REQUIRED IMPORTED_TARGET libqrencode)
  set(USE_QRCODE TRUE)
endif()

cmake_dependent_option(WITH_DBUS "Enable DBus support." ON "CMAKE_SYSTEM_NAME STREQUAL \"Linux\" AND BUILD_GUI" OFF)
cmake_dependent_option(BUILD_GUI_TESTS "Build test_bitcoin-qt executable." ON "BUILD_GUI;BUILD_TESTS" OFF)
if(BUILD_GUI)
  set(qt_components Core Gui Widgets LinguistTools)
  if(ENABLE_WALLET)
    list(APPEND qt_components Network)
  endif()
  if(WITH_DBUS)
    list(APPEND qt_components DBus)
    set(USE_DBUS TRUE)
  endif()
  if(BUILD_GUI_TESTS)
    list(APPEND qt_components Test)
  endif()
  find_package(Qt5 5.11.3 MODULE REQUIRED
    COMPONENTS ${qt_components}
  )
  unset(qt_components)
endif()

option(BUILD_BENCH "Build bench_bitcoin executable." OFF)
option(BUILD_FUZZ_BINARY "Build fuzz binary." OFF)
cmake_dependent_option(BUILD_FOR_FUZZING "Build for fuzzing. Enabling this will disable all other targets and override BUILD_FUZZ_BINARY." OFF "NOT MSVC" OFF)

set(configure_warnings)

include(CheckPIESupported)
check_pie_supported(OUTPUT_VARIABLE check_pie_output LANGUAGES CXX)
if(CMAKE_CXX_LINK_PIE_SUPPORTED)
  set(CMAKE_POSITION_INDEPENDENT_CODE ON)
elseif(NOT WIN32)
  # The warning is superfluous for Windows.
  message(WARNING "PIE is not supported at link time: ${check_pie_output}")
  list(APPEND configure_warnings "Position independent code disabled.")
endif()
unset(check_pie_output)

# The core_interface library aims to encapsulate common build flags.
# It is a usage requirement for all targets except for secp256k1, which
# gets its flags by other means.
add_library(core_interface INTERFACE)
add_library(core_interface_relwithdebinfo INTERFACE)
add_library(core_interface_debug INTERFACE)
target_link_libraries(core_interface INTERFACE
  $<$<CONFIG:RelWithDebInfo>:core_interface_relwithdebinfo>
  $<$<CONFIG:Debug>:core_interface_debug>
)

if(BUILD_FOR_FUZZING)
  message(WARNING "BUILD_FOR_FUZZING=ON will disable all other targets and force BUILD_FUZZ_BINARY=ON.")
  set(BUILD_DAEMON OFF)
  set(BUILD_CLI OFF)
  set(BUILD_TX OFF)
  set(BUILD_UTIL OFF)
  set(BUILD_WALLET_TOOL OFF)
  set(BUILD_GUI OFF)
  set(ENABLE_EXTERNAL_SIGNER OFF)
  set(WITH_NATPMP OFF)
  set(WITH_MINIUPNPC OFF)
  set(WITH_ZMQ OFF)
  set(BUILD_TESTS OFF)
  set(BUILD_GUI_TESTS OFF)
  set(BUILD_BENCH OFF)
  set(BUILD_FUZZ_BINARY ON)

  target_compile_definitions(core_interface INTERFACE
    ABORT_ON_FAILED_ASSUME
  )
endif()

include(ProcessConfigurations)

include(TryAppendCXXFlags)
include(TryAppendLinkerFlag)

if(WIN32)
  #[=[
  This build system supports two ways to build binaries for Windows.

  1. Building on Windows using MSVC.
  Implementation notes:
  - /DWIN32 and /D_WINDOWS definitions are included into the CMAKE_CXX_FLAGS_INIT
    and CMAKE_CXX_FLAGS_INIT variables by default.
  - A run-time library is selected using the CMAKE_MSVC_RUNTIME_LIBRARY variable.
  - MSVC-specific options, for example, /Zc:__cplusplus, are additionally required.

  2. Cross-compiling using MinGW.
  Implementation notes:
  - WIN32 and _WINDOWS definitions must be provided explicitly.
  - A run-time library must be specified explicitly using _MT definition.
  ]=]

  target_compile_definitions(core_interface INTERFACE
    _WIN32_WINNT=0x0601
    _WIN32_IE=0x0501
    WIN32_LEAN_AND_MEAN
    NOMINMAX
  )

  if(MSVC)
    if(VCPKG_TARGET_TRIPLET MATCHES "-static")
      set(msvc_library_linkage "")
    else()
      set(msvc_library_linkage "DLL")
    endif()
    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>${msvc_library_linkage}")
    unset(msvc_library_linkage)

    target_compile_definitions(core_interface INTERFACE
      _UNICODE;UNICODE
    )
    target_compile_options(core_interface INTERFACE
      /utf-8
      /Zc:preprocessor
      /Zc:__cplusplus
      /sdl
    )
    # Improve parallelism in MSBuild.
    # See: https://devblogs.microsoft.com/cppblog/improved-parallelism-in-msbuild/.
    list(APPEND CMAKE_VS_GLOBALS "UseMultiToolTask=true")
  endif()

  if(MINGW)
    target_compile_definitions(core_interface INTERFACE
      WIN32
      _WINDOWS
      _MT
    )
    # Avoid the use of aligned vector instructions when building for Windows.
    # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54412.
    try_append_cxx_flags("-Wa,-muse-unaligned-vector-move" TARGET core_interface SKIP_LINK)
    try_append_linker_flag("-static" TARGET core_interface)
    # We require Windows 7 (NT 6.1) or later.
    try_append_linker_flag("-Wl,--major-subsystem-version,6" TARGET core_interface)
    try_append_linker_flag("-Wl,--minor-subsystem-version,1" TARGET core_interface)
  endif()
endif()

# Use 64-bit off_t on 32-bit Linux.
if (CMAKE_SYSTEM_NAME STREQUAL "Linux" AND CMAKE_SIZEOF_VOID_P EQUAL 4)
  # Ensure 64-bit offsets are used for filesystem accesses for 32-bit compilation.
  target_compile_definitions(core_interface INTERFACE
    _FILE_OFFSET_BITS=64
  )
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  target_compile_definitions(core_interface INTERFACE
    MAC_OSX
    OBJC_OLD_DISPATCH_PROTOTYPES=0
  )
  # These flags are specific to ld64, and may cause issues with other linkers.
  # For example: GNU ld will interpret -dead_strip as -de and then try and use
  # "ad_strip" as the symbol for the entry point.
  try_append_linker_flag("-Wl,-dead_strip" TARGET core_interface)
  try_append_linker_flag("-Wl,-dead_strip_dylibs" TARGET core_interface)
  if(CMAKE_HOST_APPLE)
    try_append_linker_flag("-Wl,-headerpad_max_install_names" TARGET core_interface)
  endif()
endif()

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(core_interface INTERFACE
  Threads::Threads
)

add_library(sanitize_interface INTERFACE)
target_link_libraries(core_interface INTERFACE sanitize_interface)
if(SANITIZERS)
  # First check if the compiler accepts flags. If an incompatible pair like
  # -fsanitize=address,thread is used here, this check will fail. This will also
  # fail if a bad argument is passed, e.g. -fsanitize=undfeined
  try_append_cxx_flags("-fsanitize=${SANITIZERS}" TARGET sanitize_interface
    RESULT_VAR cxx_supports_sanitizers
    SKIP_LINK
  )
  if(NOT cxx_supports_sanitizers)
    message(FATAL_ERROR "Compiler did not accept requested flags.")
  endif()

  # Some compilers (e.g. GCC) require additional libraries like libasan,
  # libtsan, libubsan, etc. Make sure linking still works with the sanitize
  # flag. This is a separate check so we can give a better error message when
  # the sanitize flags are supported by the compiler but the actual sanitizer
  # libs are missing.
  try_append_linker_flag("-fsanitize=${SANITIZERS}" VAR SANITIZER_LDFLAGS
    SOURCE "
      #include <cstdint>
      #include <cstddef>
      extern \"C\" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { return 0; }
      __attribute__((weak)) // allow for libFuzzer linking
      int main() { return 0; }
    "
    RESULT_VAR linker_supports_sanitizers
  )
  if(NOT linker_supports_sanitizers)
    message(FATAL_ERROR "Linker did not accept requested flags, you are missing required libraries.")
  endif()
endif()
target_link_options(sanitize_interface INTERFACE ${SANITIZER_LDFLAGS})

if(BUILD_FUZZ_BINARY)
  include(CheckSourceCompilesAndLinks)
  check_cxx_source_links_with_flags("${SANITIZER_LDFLAGS}" "
      #include <cstdint>
      #include <cstddef>
      extern \"C\" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { return 0; }
      // No main() function.
    " FUZZ_BINARY_LINKS_WITHOUT_MAIN_FUNCTION
  )
endif()

include(AddBoostIfNeeded)
add_boost_if_needed()

if(BUILD_DAEMON OR BUILD_GUI OR BUILD_CLI OR BUILD_TESTS OR BUILD_BENCH OR BUILD_FUZZ_BINARY)
  find_package(Libevent 2.1.8 MODULE REQUIRED)
endif()

include(cmake/introspection.cmake)

include(cmake/ccache.cmake)

# Don't allow extended (non-ASCII) symbols in identifiers. This is easier for code review.
try_append_cxx_flags("-fno-extended-identifiers" TARGET core_interface SKIP_LINK)

# Currently all versions of gcc are subject to a class of bugs, see the
# gccbug_90348 test case (only reproduces on GCC 11 and earlier) and
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111843. To work around that, set
# -fstack-reuse=none for all gcc builds. (Only gcc understands this flag).
try_append_cxx_flags("-fstack-reuse=none" TARGET core_interface)

if(ENABLE_HARDENING)
  add_library(hardening_interface INTERFACE)
  target_link_libraries(core_interface INTERFACE hardening_interface)
  if(MSVC)
    try_append_linker_flag("/DYNAMICBASE" TARGET hardening_interface)
    try_append_linker_flag("/HIGHENTROPYVA" TARGET hardening_interface)
    try_append_linker_flag("/NXCOMPAT" TARGET hardening_interface)
  else()
    try_append_cxx_flags("-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3"
      RESULT_VAR cxx_supports_fortify_source
    )
    if(cxx_supports_fortify_source)
      # When the build configuration is Debug, all optimizations are disabled.
      # However, _FORTIFY_SOURCE requires that there is some level of optimization,
      # otherwise it does nothing and just creates a compiler warning.
      # Since _FORTIFY_SOURCE is a no-op without optimizations, do not enable it
      # when the build configuration is Debug.
      target_compile_options(hardening_interface INTERFACE
        $<$<NOT:$<CONFIG:Debug>>:-U_FORTIFY_SOURCE>
        $<$<NOT:$<CONFIG:Debug>>:-D_FORTIFY_SOURCE=3>
      )
    endif()
    unset(cxx_supports_fortify_source)

    try_append_cxx_flags("-Wstack-protector" TARGET hardening_interface SKIP_LINK)
    try_append_cxx_flags("-fstack-protector-all" TARGET hardening_interface)
    try_append_cxx_flags("-fcf-protection=full" TARGET hardening_interface)

    if(MINGW)
      # stack-clash-protection doesn't compile with GCC 10 and earlier.
      # In any case, it is a no-op for Windows.
      # See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90458 for more details.
    else()
      try_append_cxx_flags("-fstack-clash-protection" TARGET hardening_interface)
    endif()

    if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64")
      try_append_cxx_flags("-mbranch-protection=bti" TARGET hardening_interface SKIP_LINK)
    endif()

    try_append_linker_flag("-Wl,--enable-reloc-section" TARGET hardening_interface)
    try_append_linker_flag("-Wl,--dynamicbase" TARGET hardening_interface)
    try_append_linker_flag("-Wl,--nxcompat" TARGET hardening_interface)
    try_append_linker_flag("-Wl,--high-entropy-va" TARGET hardening_interface)
    try_append_linker_flag("-Wl,-z,relro" TARGET hardening_interface)
    try_append_linker_flag("-Wl,-z,now" TARGET hardening_interface)
    try_append_linker_flag("-Wl,-z,separate-code" TARGET hardening_interface)
    if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
      try_append_linker_flag("-Wl,-fixup_chains" TARGET hardening_interface)
    endif()
  endif()
endif()

if(REDUCE_EXPORTS)
  set(CMAKE_CXX_VISIBILITY_PRESET hidden)
  try_append_linker_flag("-Wl,--exclude-libs,ALL" TARGET core_interface)
  try_append_linker_flag("-Wl,-no_exported_symbols" VAR CMAKE_EXE_LINKER_FLAGS)
endif()

if(WERROR)
  if(MSVC)
    set(werror_flag "/WX")
  else()
    set(werror_flag "-Werror")
  endif()
  try_append_cxx_flags(${werror_flag} TARGET core_interface SKIP_LINK RESULT_VAR compiler_supports_werror)
  if(NOT compiler_supports_werror)
    message(FATAL_ERROR "WERROR set but ${werror_flag} is not usable.")
  endif()
  unset(werror_flag)
endif()

find_package(Python3 3.9 COMPONENTS Interpreter)
if(Python3_EXECUTABLE)
  set(PYTHON_COMMAND ${Python3_EXECUTABLE})
else()
  list(APPEND configure_warnings
    "Minimum required Python not found. Utils and rpcauth tests are disabled."
  )
endif()

if(BUILD_TESTS)
  enable_testing()
endif()
# TODO: The `CMAKE_SKIP_BUILD_RPATH` variable setting can be deleted
#       in the future after reordering Guix script commands to
#       perform binary checks after the installation step.
# Relevant discussions:
# - https://github.com/hebasto/bitcoin/pull/236#issuecomment-2183120953
# - https://github.com/bitcoin/bitcoin/pull/30312#issuecomment-2191235833
set(CMAKE_SKIP_BUILD_RPATH TRUE)
set(CMAKE_SKIP_INSTALL_RPATH TRUE)
add_subdirectory(test)

include(cmake/crc32c.cmake)
include(cmake/leveldb.cmake)
include(cmake/minisketch.cmake)
add_subdirectory(src)

include(cmake/tests.cmake)

message("\n")
message("Configure summary")
message("=================")
message("Executables:")
message("  bitcoind ............................ ${BUILD_DAEMON}")
message("  bitcoin-qt (GUI) .................... ${BUILD_GUI}")
message("  bitcoin-cli ......................... ${BUILD_CLI}")
message("  bitcoin-tx .......................... ${BUILD_TX}")
message("  bitcoin-util ........................ ${BUILD_UTIL}")
message("  bitcoin-wallet ...................... ${BUILD_WALLET_TOOL}")
message("Optional features:")
message("  wallet support ...................... ${ENABLE_WALLET}")
if(ENABLE_WALLET)
  message("   - descriptor wallets (SQLite) ...... ${WITH_SQLITE}")
  message("   - legacy wallets (Berkeley DB) ..... ${WITH_BDB}")
endif()
message("  external signer ..................... ${ENABLE_EXTERNAL_SIGNER}")
message("  port mapping:")
message("   - using NAT-PMP .................... ${WITH_NATPMP}")
message("   - using UPnP ....................... ${WITH_MINIUPNPC}")
message("  ZeroMQ .............................. ${WITH_ZMQ}")
message("  USDT tracing ........................ ${WITH_USDT}")
message("  QR code (GUI) ....................... ${WITH_QRENCODE}")
message("  DBus (GUI, Linux only) .............. ${WITH_DBUS}")
message("Tests:")
message("  test_bitcoin ........................ ${BUILD_TESTS}")
message("  test_bitcoin-qt ..................... ${BUILD_GUI_TESTS}")
message("  bench_bitcoin ....................... ${BUILD_BENCH}")
message("  fuzz binary ......................... ${BUILD_FUZZ_BINARY}")
message("")
message("C++ compiler .......................... ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}, ${CMAKE_CXX_COMPILER}")
include(FlagsSummary)
flags_summary()
message("Attempt to harden executables ......... ${ENABLE_HARDENING}")
message("Treat compiler warnings as errors ..... ${WERROR}")
message("Use ccache for compiling .............. ${WITH_CCACHE}")
message("\n")
if(configure_warnings)
    message("  ******\n")
    foreach(warning IN LISTS configure_warnings)
      message(WARNING "${warning}")
    endforeach()
    message("  ******\n")
endif()

# We want all build properties to be encapsulated properly.
include(WarnAboutGlobalProperties)