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# Copyright (c) 2024-present The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/.
#[=======================================================================[
FindLibevent
------------
Finds the Libevent headers and libraries.
This is a wrapper around find_package()/pkg_check_modules() commands that:
- facilitates searching in various build environments
- prints a standard log message
#]=======================================================================]
# Check whether evhttp_connection_get_peer expects const char**.
# See https://github.com/libevent/libevent/commit/a18301a2bb160ff7c3ffaf5b7653c39ffe27b385
function(check_evhttp_connection_get_peer target)
include(CMakePushCheckState)
cmake_push_check_state(RESET)
set(CMAKE_REQUIRED_LIBRARIES ${target})
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
#include <cstdint>
#include <event2/http.h>
int main()
{
evhttp_connection* conn = (evhttp_connection*)1;
const char* host;
uint16_t port;
evhttp_connection_get_peer(conn, &host, &port);
}
" HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR
)
cmake_pop_check_state()
set(HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR ${HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR} PARENT_SCOPE)
endfunction()
set(_libevent_components core extra)
if(NOT WIN32)
list(APPEND _libevent_components pthreads)
endif()
find_package(Libevent ${Libevent_FIND_VERSION} QUIET
NO_MODULE
)
include(FindPackageHandleStandardArgs)
if(Libevent_FOUND)
find_package(Libevent ${Libevent_FIND_VERSION} QUIET
REQUIRED COMPONENTS ${_libevent_components}
NO_MODULE
)
find_package_handle_standard_args(Libevent
REQUIRED_VARS Libevent_DIR
VERSION_VAR Libevent_VERSION
)
check_evhttp_connection_get_peer(libevent::extra)
else()
find_package(PkgConfig REQUIRED)
foreach(component IN LISTS _libevent_components)
pkg_check_modules(libevent_${component}
REQUIRED QUIET
IMPORTED_TARGET GLOBAL
libevent_${component}>=${Libevent_FIND_VERSION}
)
if(TARGET PkgConfig::libevent_${component} AND NOT TARGET libevent::${component})
add_library(libevent::${component} ALIAS PkgConfig::libevent_${component})
endif()
endforeach()
find_package_handle_standard_args(Libevent
REQUIRED_VARS libevent_core_LIBRARY_DIRS
VERSION_VAR libevent_core_VERSION
)
check_evhttp_connection_get_peer(PkgConfig::libevent_extra)
endif()
unset(_libevent_components)
mark_as_advanced(Libevent_DIR)
mark_as_advanced(_event_h)
mark_as_advanced(_event_lib)
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