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# Author: Kang Lin (kl222@126.com)
# Try to find Libevent
# Once done, this will define
#
# Libevent_FOUND - system has Libevent
# Libevent_INCLUDE_DIRS - Libevent include directories
# Libevent_LIBRARIES - libraries needed to use Libevent
#
# and the following imported targets
#
# Libevent::core - the core functons of Libevent
# Libevent::extra - extra functions, contains http, dns and rpc
# Libevent::pthreads - multiple threads for Libevent, not exists on Windows
# Libevent::openssl - openssl support for Libevent
macro(no_component_msg _comp)
if(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED_${_comp})
set(pthreadlib)
if(NOT WIN32)
set(pthreadlib ", pthreads")
endif()
message(FATAL_ERROR "Your libevent library does not contain a ${_comp} component!\n"
"The valid components are core, extra${pthreadlib} and openssl.")
else()
message_if_needed(WARNING "Your libevent library does not contain a ${_comp} component!")
endif()
endmacro()
set(_AVAILABLE_LIBS core extra openssl pthreads)
set(_EVENT_COMPONENTS)
if(${CMAKE_FIND_PACKAGE_NAME}_FIND_COMPONENTS)
foreach(_comp ${${CMAKE_FIND_PACKAGE_NAME}_FIND_COMPONENTS})
list(FIND _AVAILABLE_LIBS ${_comp} _INDEX)
if(_INDEX GREATER -1)
list(APPEND _EVENT_COMPONENTS ${_comp})
else()
no_component_msg(${_comp})
endif()
endforeach()
else()
set(_EVENT_COMPONENTS core extra openssl)
if(NOT WIN32)
list(APPEND _EVENT_COMPONENTS pthreads)
endif()
endif()
foreach(_libevent_comp ${_EVENT_COMPONENTS})
list(APPEND _libevent_comps libevent_${_libevent_comp})
endforeach()
find_package(PkgConfig)
pkg_check_modules(PC_Libevent QUIET ${_libevent_comps})
if(PC_Libevent_FOUND)
set(Libevent_VERSION ${PC_Libevent_VERSION})
else()
foreach(_libevent_comp ${_EVENT_COMPONENTS})
list(APPEND PC_Libevent_LIBRARIES event_${_libevent_comp})
endforeach()
endif()
find_path(Libevent_INCLUDE_DIR
NAMES event2/event.h
HINTS ${Libevent_ROOT} ${PC_Libevent_INCLUDEDIR} ${PC_Libevent_INCLUDE_DIRS} /usr
PATHS $ENV{Libevent_DIR} ${Libevent_DIR}
PATH_SUFFIXES include
)
foreach(Libevent_var ${PC_Libevent_LIBRARIES})
unset(Libevent_lib CACHE)
find_library(
Libevent_lib
NAMES
${Libevent_var}
HINTS ${Libevent_ROOT} ${PC_Libevent_LIBDIR} ${PC_Libevent_LIBRARY_DIRS}
PATHS $ENV{Libevent_DIR} ${Libevent_DIR}
PATH_SUFFIXES ${CMAKE_INSTALL_LIBDIR} lib)
if(Libevent_lib)
string(REPLACE event_ "" _name ${Libevent_var})
add_library(Libevent::${_name} UNKNOWN IMPORTED)
set_target_properties(Libevent::${_name} PROPERTIES
IMPORTED_LOCATION "${Libevent_lib}"
INTERFACE_INCLUDE_DIRECTORIES "${Libevent_INCLUDE_DIR}")
list(APPEND Libevent_LIBRARY ${Libevent_lib})
endif()
endforeach()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Libevent
REQUIRED_VARS Libevent_LIBRARY Libevent_INCLUDE_DIR)
mark_as_advanced(Libevent_FOUND Libevent_INCLUDE_DIR Libevent_LIBRARY Libevent_lib)
set(Libevent_INCLUDE_DIRS ${Libevent_INCLUDE_DIR})
set(Libevent_LIBRARIES ${Libevent_LIBRARY})
unset(Libevent_INCLUDE_DIR)
unset(Libevent_LIBRARY)
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