153 lines
6.0 KiB
CMake
153 lines
6.0 KiB
CMake
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# - Try to find libevent
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#.rst
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# FindLibevent
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# ------------
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#
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# Find Libevent include directories and libraries. Invoke as::
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#
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# find_package(Libevent
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# [version] [EXACT] # Minimum or exact version
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# [REQUIRED] # Fail if Libevent is not found
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# [COMPONENT <C>...]) # Libraries to look for
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#
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# Valid components are one or more of:: libevent core extra pthreads openssl.
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# Note that 'libevent' contains both core and extra. You must specify one of
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# them for the other components.
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#
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# This module will define the following variables::
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#
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# LIBEVENT_FOUND - True if headers and requested libraries were found
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# LIBEVENT_INCLUDE_DIRS - Libevent include directories
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# LIBEVENT_LIBRARIES - Libevent libraries to be linked
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# LIBEVENT_<C>_FOUND - Component <C> was found (<C> is uppercase)
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# LIBEVENT_<C>_LIBRARY - Library to be linked for Libevent component <C>.
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find_package(PkgConfig QUIET)
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pkg_check_modules(PC_LIBEVENT QUIET libevent)
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# Support preference of static libs by adjusting CMAKE_FIND_LIBRARY_SUFFIXES
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if( Libevent_USE_STATIC_LIBS )
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set(_libevent_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES :${CMAKE_FIND_LIBRARY_SUFFIXES})
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if(WIN32)
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list(INSERT CMAKE_FIND_LIBRARY_SUFFIXES 0 .lib .a)
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else()
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set(CMAKE_FIND_LIBRARY_SUFFIXES .a)
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endif()
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else()
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set(_libevent_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES :${CMAKE_FIND_LIBRARY_SUFFIXES})
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if(WIN32)
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list(INSERT CMAKE_FIND_LIBRARY_SUFFIXES 0 .dll .so)
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else()
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set(CMAKE_FIND_LIBRARY_SUFFIXES .so)
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endif()
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endif()
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# Look for the Libevent 2.0 or 1.4 headers
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find_path(LIBEVENT_INCLUDE_DIR
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NAMES
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WIN32-Code/event2/event-config.h
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event2/event-config.h
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event-config.h
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PATHS ${CMAKE_SOURCE_DIR}/bin/include C:/libevent/include ${CMAKE_SOURCE_DIR}/win32-deps/include
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HINTS
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${PC_LIBEVENT_INCLUDE_DIRS}
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)
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# ------------------------------------------------------------------------
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# Prefix initialization
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# ------------------------------------------------------------------------
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set(Libevent_LIB_PREFIX "")
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set(LIBEVENT_EVENT_CONFIG_DIR ${LIBEVENT_INCLUDE_DIR})
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if(WIN32)
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set(Libevent_LIB_PREFIX "lib")
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set(LIBEVENT_EVENT_CONFIG_DIR "${LIBEVENT_INCLUDE_DIR}/../WIN32-Code/")
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endif()
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if(LIBEVENT_INCLUDE_DIR)
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set(_version_regex "^#define[ \t]+_EVENT_VERSION[ \t]+\"([^\"]+)\".*")
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if(EXISTS "${LIBEVENT_EVENT_CONFIG_DIR}/event2/event-config.h")
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# Libevent 2.0
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file(STRINGS "${LIBEVENT_EVENT_CONFIG_DIR}/event2/event-config.h"
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LIBEVENT_VERSION REGEX "${_version_regex}")
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else()
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# Libevent 1.4
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if(EXISTS "${LIBEVENT_EVENT_CONFIG_DIR}/event-config.h")
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file(STRINGS "${LIBEVENT_EVENT_CONFIG_DIR}/event-config.h"
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LIBEVENT_VERSION REGEX "${_version_regex}")
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endif()
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endif()
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string(REGEX REPLACE "${_version_regex}" "\\1"
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LIBEVENT_VERSION "${LIBEVENT_VERSION}")
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unset(_version_regex)
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endif()
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set(_LIBEVENT_REQUIRED_VARS)
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if(WIN32)
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set(Libevent_FIND_COMPONENTS ${Libevent_LIB_PREFIX}event core extras)
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else()
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set(Libevent_FIND_COMPONENTS ${Libevent_LIB_PREFIX}event core extra pthreads)
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endif()
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message(status "** libevent components: ${Libevent_FIND_COMPONENTS}")
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foreach(COMPONENT ${Libevent_FIND_COMPONENTS})
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set(_LIBEVENT_LIBNAME "${Libevent_LIB_PREFIX}event")
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# Note: compare two variables to avoid a CMP0054 policy warning
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if(COMPONENT STREQUAL _LIBEVENT_LIBNAME)
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set(_LIBEVENT_LIBNAME "${Libevent_LIB_PREFIX}event")
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else()
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set(_LIBEVENT_LIBNAME "${Libevent_LIB_PREFIX}event_${COMPONENT}")
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endif()
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string(TOUPPER "${COMPONENT}" COMPONENT_UPPER)
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message(status "** ${_LIBEVENT_LIBNAME}")
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find_library(LIBEVENT_${COMPONENT_UPPER}_LIBRARY
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NAMES ${_LIBEVENT_LIBNAME}
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PATHS ${CMAKE_SOURCE_DIR}/bin/lib C:/libevent-2.0.22-stable C:/libevent-2.0.22-stable/lib C:/libevent/lib ${CMAKE_SOURCE_DIR}/win32-deps/lib
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HINTS ${PC_LIBEVENT_LIBRARY_DIRS}
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)
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if(LIBEVENT_${COMPONENT_UPPER}_LIBRARY)
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set(Libevent_${COMPONENT}_FOUND 1)
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endif()
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list(APPEND _LIBEVENT_REQUIRED_VARS LIBEVENT_${COMPONENT_UPPER}_LIBRARY)
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endforeach()
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unset(_LIBEVENT_LIBNAME)
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include(FindPackageHandleStandardArgs)
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# handle the QUIETLY and REQUIRED arguments and set LIBEVENT_FOUND to TRUE
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# if all listed variables are TRUE and the requested version matches.
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find_package_handle_standard_args(Libevent REQUIRED_VARS
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${_LIBEVENT_REQUIRED_VARS}
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LIBEVENT_INCLUDE_DIR
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VERSION_VAR LIBEVENT_VERSION
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HANDLE_COMPONENTS)
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if(LIBEVENT_FOUND)
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set(LIBEVENT_INCLUDE_DIRS ${LIBEVENT_INCLUDE_DIR})
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set(LIBEVENT_LIBRARIES)
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foreach(COMPONENT ${Libevent_FIND_COMPONENTS})
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string(TOUPPER "${COMPONENT}" COMPONENT_UPPER)
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list(APPEND LIBEVENT_LIBRARIES ${LIBEVENT_${COMPONENT_UPPER}_LIBRARY})
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set(LIBEVENT_${COMPONENT_UPPER}_FOUND ${Libevent_${COMPONENT}_FOUND})
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endforeach()
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endif()
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mark_as_advanced(LIBEVENT_INCLUDE_DIR ${_LIBEVENT_REQUIRED_VARS})
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# Restore the original find library ordering
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if( Libevent_USE_STATIC_LIBS )
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set(CMAKE_FIND_LIBRARY_SUFFIXES ${_libevent_ORIG_CMAKE_FIND_LIBRARY_SUFFIXES})
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endif()
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unset(_LIBEVENT_REQUIRED_VARS)
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