# OpenThreads is a C++ based threading library. Its largest userbase 
# seems to OpenSceneGraph so you might notice I accept OSGDIR as an
# environment path.
# I consider this part of the Findosg* suite used to find OpenSceneGraph 
# components.
# Each component is separate and you must opt in to each module.
# 
# Locate OpenThreads
# This module defines
# OPENTHREADS_LIBRARY
# OPENTHREADS_FOUND, if false, do not try to link to OpenThreads
# OPENTHREADS_INCLUDE_DIR, where to find the headers
#
# $OPENTHREADS_DIR is an environment variable that would
# correspond to the ./configure --prefix=$OPENTHREADS_DIR
# used in building osg.
#
# Created by Eric Wing.

# Header files are presumed to be included like
# #include <OpenThreads/Thread>

# To make it easier for one-step automated configuration/builds,
# we leverage environmental paths. This is preferable 
# to the -DVAR=value switches because it insulates the 
# users from changes we may make in this script.
# It also offers a little more flexibility than setting
# the CMAKE_*_PATH since we can target specific components.
# However, the default CMake behavior will search system paths
# before anything else. This is problematic in the cases
# where you have an older (stable) version installed, but
# are trying to build a newer version.
# CMake doesn't offer a nice way to globally control this behavior
# so we have to do a nasty "double FIND_" in this module.
# The first FIND disables the CMAKE_ search paths and only checks
# the environmental paths.
# If nothing is found, then the second find will search the
# standard install paths.
# Explicit -DVAR=value arguments should still be able to override everything.

FIND_PATH(OPENTHREADS_INCLUDE_DIR OpenThreads/Thread
	$ENV{OPENTHREADS_INCLUDE_DIR}
	$ENV{OPENTHREADS_DIR}/include
	$ENV{OPENTHREADS_DIR}
	$ENV{OSG_INCLUDE_DIR}
	$ENV{OSG_DIR}/include
	$ENV{OSG_DIR}
	NO_DEFAULT_PATH
)

IF(NOT OPENTHREADS_INCLUDE_DIR)
	FIND_PATH(OPENTHREADS_INCLUDE_DIR OpenThreads/Thread
		~/Library/Frameworks
		/Library/Frameworks
		/usr/local/include
		/usr/include
		/sw/include # Fink
		/opt/local/include # DarwinPorts
		/opt/csw/include # Blastwave
		/opt/include
		[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/include
		${CMAKE_INSTALL_PREFIX}/include # hack: this should be last because it can interfere badly with other search paths in the case where you do not explicitly set this value and CMake invokes its default value which may not be what you want.
	)
ENDIF(NOT OPENTHREADS_INCLUDE_DIR)


FIND_LIBRARY(OPENTHREADS_LIBRARY 
	NAMES OpenThreads OpenThreadsWin32 
	PATHS
	$ENV{OPENTHREADS_LIBRARY_DIR}
	$ENV{OPENTHREADS_DIR}/lib64
	$ENV{OPENTHREADS_DIR}/lib
	$ENV{OPENTHREADS_DIR}
	$ENV{OSG_LIBRARY_DIR}
	$ENV{OSG_DIR}/lib64
	$ENV{OSG_DIR}/lib
	$ENV{OSG_DIR}
	NO_DEFAULT_PATH
)

IF(NOT OPENTHREADS_LIBRARY)
	FIND_LIBRARY(OPENTHREADS_LIBRARY 
		NAMES OpenThreads OpenThreadsWin32 
		PATHS
		~/Library/Frameworks
		/Library/Frameworks
		/usr/local/lib64
		/usr/local/lib
		/usr/lib64
		/usr/lib
		/sw/lib64
		/sw/lib
		/opt/local/lib64
		/opt/local/lib
		/opt/csw/lib64
		/opt/csw/lib
		/opt/lib64
		/opt/lib
		[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/lib
		${CMAKE_INSTALL_PREFIX}/lib64 # hack: this should be last because it can interfere badly with other search paths in the case where you do not explicitly set this value and CMake invokes its default value which may not be what you want.
		${CMAKE_INSTALL_PREFIX}/lib # hack
	)
ENDIF(NOT OPENTHREADS_LIBRARY)


FIND_LIBRARY(OPENTHREADS_LIBRARY_DEBUG 
	NAMES OpenThreadsd OpenThreadsWin32d
	PATHS
	$ENV{OPENTHREADS_LIBRARY_DIR}
	$ENV{OPENTHREADS_DIR}/lib64
	$ENV{OPENTHREADS_DIR}/lib
	$ENV{OPENTHREADS_DIR}
	$ENV{OSG_LIBRARY_DIR}
	$ENV{OSG_DIR}/lib64
	$ENV{OSG_DIR}/lib
	$ENV{OSG_DIR}
	NO_DEFAULT_PATH
)

IF(NOT OPENTHREADS_LIBRARY_DEBUG)
	FIND_LIBRARY(OPENTHREADS_LIBRARY_DEBUG 
		NAMES OpenThreadsd OpenThreadsWin32d
		PATHS
		/usr/local/lib64
		/usr/local/lib
		/usr/lib64
		/usr/lib
		/sw/lib64
		/sw/lib
		/opt/local/lib64
		/opt/local/lib
		/opt/csw/lib64
		/opt/csw/lib
		/opt/lib64
		/opt/lib
		[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/lib
		${CMAKE_INSTALL_PREFIX}/lib64 # hack: this should be last because it can interfere badly with other search paths in the case where you do not explicitly set this value and CMake invokes its default value which may not be what you want.
		${CMAKE_INSTALL_PREFIX}/lib # hack
	)
ENDIF(NOT OPENTHREADS_LIBRARY_DEBUG)


IF(OPENTHREADS_LIBRARY)
  IF(NOT OPENTHREADS_LIBRARY_DEBUG)
	  #MESSAGE("-- Warning Debug OpenThreads not found, using: ${OPENTHREADS_LIBRARY}")
	  #SET(OPENTHREADS_LIBRARY_DEBUG "${OPENTHREADS_LIBRARY}")
	  SET(OPENTHREADS_LIBRARY_DEBUG "${OPENTHREADS_LIBRARY}" CACHE FILEPATH "Debug version of OpenThreads Library (use regular version if not available)" FORCE)
  ENDIF(NOT OPENTHREADS_LIBRARY_DEBUG)
ENDIF(OPENTHREADS_LIBRARY)
	
SET(OPENTHREADS_FOUND "NO")
IF(OPENTHREADS_INCLUDE_DIR AND OPENTHREADS_LIBRARY)
  SET(OPENTHREADS_FOUND "YES")
  # MESSAGE("-- Found OpenThreads: "${OPENTHREADS_LIBRARY})
ENDIF(OPENTHREADS_INCLUDE_DIR AND OPENTHREADS_LIBRARY)