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# 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.

# Note: We have added an additional check for ${CMAKE_PREFIX_PATH}.

# This is not an official CMake variable, but one we are proposing be

# added to CMake. Be warned that this may go away or the variable name

# may change.

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

        PATHS ${CMAKE_PREFIX_PATH}

        PATH_SUFFIXES include

    )

ENDIF(NOT OPENTHREADS_INCLUDE_DIR)

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;OpenThreads_ROOT]/include

        [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/include

    )

ENDIF(NOT OPENTHREADS_INCLUDE_DIR)

MARK_AS_ADVANCED(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 ${CMAKE_PREFIX_PATH}

        PATH_SUFFIXES lib64 lib

    )

ENDIF(NOT OPENTHREADS_LIBRARY)

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;OpenThreads_ROOT]/lib

        [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/lib

    )

ENDIF(NOT OPENTHREADS_LIBRARY)

MARK_AS_ADVANCED(OPENTHREADS_LIBRARY)

FIND_LIBRARY(OPENTHREADS_LIBRARY_DEBUG 

    NAMES OpenThreadsd OpenThreadsWin32d

    PATHS

    $ENV{OPENTHREADS_DEBUG_LIBRARY_DIR}

    $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}

    ${CMAKE_PREFIX_PATH}/lib64

    ${CMAKE_PREFIX_PATH}/lib

    ${CMAKE_PREFIX_PATH}

    NO_DEFAULT_PATH

)

IF(NOT OPENTHREADS_LIBRARY_DEBUG)

    FIND_LIBRARY(OPENTHREADS_LIBRARY_DEBUG 

        NAMES OpenThreadsd OpenThreadsWin32d

        PATHS ${CMAKE_PREFIX_PATH}

        PATH_SUFFIXES lib64 lib

    )

ENDIF(NOT OPENTHREADS_LIBRARY_DEBUG)

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;OpenThreads_ROOT]/lib

        [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session\ Manager\\Environment;OSG_ROOT]/lib

    )

ENDIF(NOT OPENTHREADS_LIBRARY_DEBUG)

MARK_AS_ADVANCED(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)