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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindOpenThreads
---------------
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.
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.
.. versionadded:: 2.8.10
The CMake variables ``OPENTHREADS_DIR`` or ``OSG_DIR`` can now
be used as well to influence detection, instead of needing to specify
an environment variable.
#]=======================================================================]
# 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.
include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
find_path(OPENTHREADS_INCLUDE_DIR OpenThreads/Thread
HINTS
ENV OPENTHREADS_INCLUDE_DIR
ENV OPENTHREADS_DIR
ENV OSG_INCLUDE_DIR
ENV OSG_DIR
ENV OSGDIR
ENV OpenThreads_ROOT
ENV OSG_ROOT
${OPENTHREADS_DIR}
${OSG_DIR}
PATH_SUFFIXES include
)
find_library(OPENTHREADS_LIBRARY_RELEASE
NAMES OpenThreads OpenThreadsWin32
HINTS
ENV OPENTHREADS_LIBRARY_DIR
ENV OPENTHREADS_DIR
ENV OSG_LIBRARY_DIR
ENV OSG_DIR
ENV OSGDIR
ENV OpenThreads_ROOT
ENV OSG_ROOT
${OPENTHREADS_DIR}
${OSG_DIR}
PATH_SUFFIXES lib
)
find_library(OPENTHREADS_LIBRARY_DEBUG
NAMES OpenThreadsd OpenThreadsWin32d
HINTS
ENV OPENTHREADS_DEBUG_LIBRARY_DIR
ENV OPENTHREADS_LIBRARY_DIR
ENV OPENTHREADS_DIR
ENV OSG_LIBRARY_DIR
ENV OSG_DIR
ENV OSGDIR
ENV OpenThreads_ROOT
ENV OSG_ROOT
${OPENTHREADS_DIR}
${OSG_DIR}
PATH_SUFFIXES lib
)
select_library_configurations(OPENTHREADS)
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenThreads DEFAULT_MSG
OPENTHREADS_LIBRARY OPENTHREADS_INCLUDE_DIR)
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