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-rw-r--r--cmake/FindLibevent.cmake97
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diff --git a/cmake/FindLibevent.cmake b/cmake/FindLibevent.cmake
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+# - Try to find libevent
+#.rst
+# FindLibevent
+# ------------
+#
+# Find Libevent include directories and libraries. Invoke as::
+#
+# find_package(Libevent
+# [version] [EXACT] # Minimum or exact version
+# [REQUIRED] # Fail if Libevent is not found
+# [COMPONENT <C>...]) # Libraries to look for
+#
+# Valid components are one or more of:: libevent core extra pthreads openssl.
+# Note that 'libevent' contains both core and extra. You must specify one of
+# them for the other components.
+#
+# This module will define the following variables::
+#
+# LIBEVENT_FOUND - True if headers and requested libraries were found
+# LIBEVENT_INCLUDE_DIRS - Libevent include directories
+# LIBEVENT_LIBRARIES - Libevent libraries to be linked
+# LIBEVENT_<C>_FOUND - Component <C> was found (<C> is uppercase)
+# LIBEVENT_<C>_LIBRARY - Library to be linked for Libevent component <C>.
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBEVENT QUIET libevent)
+
+# Look for the Libevent 2.0 or 1.4 headers
+find_path(LIBEVENT_INCLUDE_DIR
+ NAMES
+ event2/event-config.h
+ event-config.h
+ HINTS
+ ${PC_LIBEVENT_INCLUDE_DIRS}
+)
+
+if(LIBEVENT_INCLUDE_DIR)
+ set(_version_regex "^#define[ \t]+_EVENT_VERSION[ \t]+\"([^\"]+)\".*")
+ if(EXISTS "${LIBEVENT_INCLUDE_DIR}/event2/event-config.h")
+ # Libevent 2.0
+ file(STRINGS "${LIBEVENT_INCLUDE_DIR}/event2/event-config.h"
+ LIBEVENT_VERSION REGEX "${_version_regex}")
+ if("${LIBEVENT_VERSION}" STREQUAL "")
+ set(LIBEVENT_VERSION ${PC_LIBEVENT_VERSION})
+ endif()
+ else()
+ # Libevent 1.4
+ file(STRINGS "${LIBEVENT_INCLUDE_DIR}/event-config.h"
+ LIBEVENT_VERSION REGEX "${_version_regex}")
+ endif()
+ string(REGEX REPLACE "${_version_regex}" "\\1"
+ LIBEVENT_VERSION "${LIBEVENT_VERSION}")
+ unset(_version_regex)
+endif()
+
+set(_LIBEVENT_REQUIRED_VARS)
+foreach(COMPONENT ${Libevent_FIND_COMPONENTS})
+ set(_LIBEVENT_LIBNAME libevent)
+ # Note: compare two variables to avoid a CMP0054 policy warning
+ if(COMPONENT STREQUAL _LIBEVENT_LIBNAME)
+ set(_LIBEVENT_LIBNAME event)
+ else()
+ set(_LIBEVENT_LIBNAME "event_${COMPONENT}")
+ endif()
+ string(TOUPPER "${COMPONENT}" COMPONENT_UPPER)
+ find_library(LIBEVENT_${COMPONENT_UPPER}_LIBRARY
+ NAMES ${_LIBEVENT_LIBNAME}
+ HINTS ${PC_LIBEVENT_LIBRARY_DIRS}
+ )
+ if(LIBEVENT_${COMPONENT_UPPER}_LIBRARY)
+ set(Libevent_${COMPONENT}_FOUND 1)
+ endif()
+ list(APPEND _LIBEVENT_REQUIRED_VARS LIBEVENT_${COMPONENT_UPPER}_LIBRARY)
+endforeach()
+unset(_LIBEVENT_LIBNAME)
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set LIBEVENT_FOUND to TRUE
+# if all listed variables are TRUE and the requested version matches.
+find_package_handle_standard_args(Libevent REQUIRED_VARS
+ ${_LIBEVENT_REQUIRED_VARS}
+ LIBEVENT_INCLUDE_DIR
+ VERSION_VAR LIBEVENT_VERSION
+ HANDLE_COMPONENTS)
+
+if(LIBEVENT_FOUND)
+ set(LIBEVENT_INCLUDE_DIRS ${LIBEVENT_INCLUDE_DIR})
+ set(LIBEVENT_LIBRARIES)
+ foreach(COMPONENT ${Libevent_FIND_COMPONENTS})
+ string(TOUPPER "${COMPONENT}" COMPONENT_UPPER)
+ list(APPEND LIBEVENT_LIBRARIES ${LIBEVENT_${COMPONENT_UPPER}_LIBRARY})
+ set(LIBEVENT_${COMPONENT_UPPER}_FOUND ${Libevent_${COMPONENT}_FOUND})
+ endforeach()
+endif()
+
+mark_as_advanced(LIBEVENT_INCLUDE_DIR ${_LIBEVENT_REQUIRED_VARS})
+unset(_LIBEVENT_REQUIRED_VARS)