Differential D18009 Diff 48793 cmake/modules/Findepoll.cmake

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cmake/modules/Findepoll.cmake

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		1		#.rest:
		2		# FindEpoll
		3		# --------------
		4		#
		5		# Try to find epoll or epoll-shim on this system. This finds:
		6		# - some shim on Unix like systems (FreeBSD), or
		7		# - the kernel's epoll on Linux systems.
		8		#
		9		# This will define the following variables:
		10		#
		11		# ``epoll_FOUND``
		12		# True if epoll is available
		13		# ``epoll_LIBRARIES``
		14		# This has to be passed to target_link_libraries()
		15		# ``epoll_INCLUDE_DIRS``
		16		# This has to be passed to target_include_directories()
		17		#
		18		# On Linux, the libraries and include directories are empty,
		19		# even though epoll_FOUND may be set to TRUE. This is because
		20		# no special includes or libraries are needed. On other systems
		21		# these may be needed to use epoll.
		22
		23		#=============================================================================
		24		# Copyright 2019 Tobias C. Berner <tcberner@FreeBSD.org>
		25		#
		26		# Redistribution and use in source and binary forms, with or without
		27		# modification, are permitted provided that the following conditions
		28		# are met:
		29		#
		30		# 1. Redistributions of source code must retain the copyright
		31		# notice, this list of conditions and the following disclaimer.
		32		# 2. Redistributions in binary form must reproduce the copyright
		33		# notice, this list of conditions and the following disclaimer in the
		34		# documentation and/or other materials provided with the distribution.
		35		#
		36		# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		37		# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		38		# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		39		# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		40		# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		41		# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		42		# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		43		# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		44		# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		45		# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		46		#=============================================================================
		47
		48		find_path(epoll_INCLUDE_DIRS sys/epoll.h PATH_SUFFIXES libepoll-shim)
		49
		50		if(epoll_INCLUDE_DIRS)
		51		# On Linux there is no library to link against, on the BSDs there is.
		52		# On the BSD's, epoll is implemented through a library, libepoll-shim.
		53		if( CMAKE_SYSTEM_NAME MATCHES "Linux")
		54		set(epoll_FOUND TRUE)
		55		set(epoll_LIBRARIES "")
		56		set(epoll_INCLUDE_DIRS "")
		57		else()
		58		find_library(epoll_LIBRARIES NAMES epoll-shim)
		59		include(FindPackageHandleStandardArgs)
		60		find_package_handle_standard_args(epoll
		61		FOUND_VAR
		62		epoll_FOUND
		63		REQUIRED_VARS
		64		epoll_LIBRARIES
		65		epoll_INCLUDE_DIRS
		66		)
		67		mark_as_advanced(epoll_LIBRARIES epoll_INCLUDE_DIRS)
		68		include(FeatureSummary)
		69		set_package_properties(epoll PROPERTIES
		70		URL "https://github.com/FreeBSDDesktop/epoll-shim"
		71		DESCRIPTION "small epoll implementation using kqueue"
		72		)
		73		endif()
		74		else()
		75		set(epoll_FOUND FALSE)
		76		endif()
		77
		78		mark_as_advanced(epoll_LIBRARIES epoll_INCLUDE_DIRS)