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# 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/.
function(add_boost_if_needed)
#[=[
TODO: Not all targets, which will be added in the future, require
Boost. Therefore, a proper check will be appropriate here.
Implementation notes:
Although only Boost headers are used to build Bitcoin Core,
we still leverage a standard CMake's approach to handle
dependencies, i.e., the Boost::headers "library".
A command target_link_libraries(target PRIVATE Boost::headers)
will propagate Boost::headers usage requirements to the target.
For Boost::headers such usage requirements is an include
directory and other added INTERFACE properties.
]=]
# We cannot rely on find_package(Boost ...) to work properly without
# Boost_NO_BOOST_CMAKE set until we require a more recent Boost because
# upstream did not ship proper CMake files until 1.82.0.
# Until then, we rely on CMake's FindBoost module.
# See: https://cmake.org/cmake/help/latest/policy/CMP0167.html
if(POLICY CMP0167)
cmake_policy(SET CMP0167 OLD)
endif()
set(Boost_NO_BOOST_CMAKE ON)
find_package(Boost 1.73.0 REQUIRED)
mark_as_advanced(Boost_INCLUDE_DIR)
set_target_properties(Boost::headers PROPERTIES IMPORTED_GLOBAL TRUE)
target_compile_definitions(Boost::headers INTERFACE
# We don't use multi_index serialization.
BOOST_MULTI_INDEX_DISABLE_SERIALIZATION
)
if(DEFINED VCPKG_TARGET_TRIPLET)
# Workaround for https://github.com/microsoft/vcpkg/issues/36955.
target_compile_definitions(Boost::headers INTERFACE
BOOST_NO_USER_CONFIG
)
endif()
# Prevent use of std::unary_function, which was removed in C++17,
# and will generate warnings with newer compilers for Boost
# older than 1.80.
# See: https://github.com/boostorg/config/pull/430.
set(CMAKE_REQUIRED_DEFINITIONS -DBOOST_NO_CXX98_FUNCTION_BASE)
set(CMAKE_REQUIRED_INCLUDES ${Boost_INCLUDE_DIR})
include(CMakePushCheckState)
cmake_push_check_state()
include(TryAppendCXXFlags)
set(CMAKE_REQUIRED_FLAGS ${working_compiler_werror_flag})
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
check_cxx_source_compiles("
#include <boost/config.hpp>
" NO_DIAGNOSTICS_BOOST_NO_CXX98_FUNCTION_BASE
)
cmake_pop_check_state()
if(NO_DIAGNOSTICS_BOOST_NO_CXX98_FUNCTION_BASE)
target_compile_definitions(Boost::headers INTERFACE
BOOST_NO_CXX98_FUNCTION_BASE
)
else()
set(CMAKE_REQUIRED_DEFINITIONS)
endif()
if(BUILD_TESTS)
# Some package managers, such as vcpkg, vendor Boost.Test separately
# from the rest of the headers, so we have to check for it individually.
list(APPEND CMAKE_REQUIRED_DEFINITIONS -DBOOST_TEST_NO_MAIN)
include(CheckIncludeFileCXX)
check_include_file_cxx(boost/test/included/unit_test.hpp HAVE_BOOST_INCLUDED_UNIT_TEST_H)
if(NOT HAVE_BOOST_INCLUDED_UNIT_TEST_H)
message(FATAL_ERROR "Building test_bitcoin executable requested but boost/test/included/unit_test.hpp header not available.")
endif()
endif()
endfunction()
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