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CMake/Modules/FindOpenSceneGraph.cmake
Brad King c4275592a8 Modules: Include builtin FindPackageHandleStandardArgs directly 
The FindPackageHandleStandardArgs module was originally created outside
of CMake.  It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18).  However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).

Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module.  Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.

Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line

  include(FindPackageHandleStandardArgs)

loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.

Whether this breakage can be considered a backward incompatible change
in CMake is debatable.  The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header.  Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.

This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them.  At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.

In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17).  That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy.  However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.

We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line.  Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.

The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28).  This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
2011-01-20 10:56:49 -05:00

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# - Find OpenSceneGraph
# This module searches for the OpenSceneGraph core "osg" library as well as
# OpenThreads, and whatever additional COMPONENTS (nodekits) that you specify.
# See http://www.openscenegraph.org
#
# NOTE: To use this module effectively you must either require CMake >= 2.6.3
# with cmake_minimum_required(VERSION 2.6.3) or download and place
# FindOpenThreads.cmake, Findosg_functions.cmake, Findosg.cmake,
# and Find<etc>.cmake files into your CMAKE_MODULE_PATH.
#
#==================================
#
# This module accepts the following variables (note mixed case)
#
# OpenSceneGraph_DEBUG - Enable debugging output
#
# OpenSceneGraph_MARK_AS_ADVANCED - Mark cache variables as advanced
# automatically
#
# The following environment variables are also respected for finding the OSG
# and it's various components. CMAKE_PREFIX_PATH can also be used for this
# (see find_library() CMake documentation).
#
# <MODULE>_DIR (where MODULE is of the form "OSGVOLUME" and there is a FindosgVolume.cmake file)
# OSG_DIR
# OSGDIR
# OSG_ROOT
#
# This module defines the following output variables:
#
# OPENSCENEGRAPH_FOUND - Was the OSG and all of the specified components found?
#
# OPENSCENEGRAPH_VERSION - The version of the OSG which was found
#
# OPENSCENEGRAPH_INCLUDE_DIRS - Where to find the headers
#
# OPENSCENEGRAPH_LIBRARIES - The OSG libraries
#
#==================================
# Example Usage:
#
# find_package(OpenSceneGraph 2.0.0 REQUIRED osgDB osgUtil)
# # libOpenThreads & libosg automatically searched
# include_directories(${OPENSCENEGRAPH_INCLUDE_DIRS})
#
# add_executable(foo foo.cc)
# target_link_libraries(foo ${OPENSCENEGRAPH_LIBRARIES})
#
#=============================================================================
# Copyright 2009 Kitware, Inc.
# Copyright 2009 Philip Lowman <philip@yhbt.com>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
#
# Naming convention:
# Local variables of the form _osg_foo
# Input variables of the form OpenSceneGraph_FOO
# Output variables of the form OPENSCENEGRAPH_FOO
#
include(Findosg_functions)
set(_osg_modules_to_process)
foreach(_osg_component ${OpenSceneGraph_FIND_COMPONENTS})
list(APPEND _osg_modules_to_process ${_osg_component})
endforeach()
list(APPEND _osg_modules_to_process "osg" "OpenThreads")
list(REMOVE_DUPLICATES _osg_modules_to_process)
if(OpenSceneGraph_DEBUG)
message("[ FindOpenSceneGraph.cmake:${CMAKE_CURRENT_LIST_LINE} ] "
"Components = ${_osg_modules_to_process}")
endif()
#
# First we need to find and parse osg/Version
#
OSG_FIND_PATH(OSG osg/Version)
if(OpenSceneGraph_MARK_AS_ADVANCED)
OSG_MARK_AS_ADVANCED(OSG)
endif()
# Try to ascertain the version...
if(OSG_INCLUDE_DIR)
if(OpenSceneGraph_DEBUG)
message("[ FindOpenSceneGraph.cmake:${CMAKE_CURRENT_LIST_LINE} ] "
"Detected OSG_INCLUDE_DIR = ${OSG_INCLUDE_DIR}")
endif()
set(_osg_Version_file "${OSG_INCLUDE_DIR}/osg/Version")
if("${OSG_INCLUDE_DIR}" MATCHES "\\.framework$" AND NOT EXISTS "${_osg_Version_file}")
set(_osg_Version_file "${OSG_INCLUDE_DIR}/Headers/Version")
endif()
if(EXISTS "${_osg_Version_file}")
file(READ "${_osg_Version_file}" _osg_Version_contents)
else()
set(_osg_Version_contents "unknown")
endif()
string(REGEX MATCH ".*#define OSG_VERSION_MAJOR[ \t]+[0-9]+.*"
_osg_old_defines "${_osg_Version_contents}")
string(REGEX MATCH ".*#define OPENSCENEGRAPH_MAJOR_VERSION[ \t]+[0-9]+.*"
_osg_new_defines "${_osg_Version_contents}")
if(_osg_old_defines)
string(REGEX REPLACE ".*#define OSG_VERSION_MAJOR[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_MAJOR ${_osg_Version_contents})
string(REGEX REPLACE ".*#define OSG_VERSION_MINOR[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_MINOR ${_osg_Version_contents})
string(REGEX REPLACE ".*#define OSG_VERSION_PATCH[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_PATCH ${_osg_Version_contents})
elseif(_osg_new_defines)
string(REGEX REPLACE ".*#define OPENSCENEGRAPH_MAJOR_VERSION[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_MAJOR ${_osg_Version_contents})
string(REGEX REPLACE ".*#define OPENSCENEGRAPH_MINOR_VERSION[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_MINOR ${_osg_Version_contents})
string(REGEX REPLACE ".*#define OPENSCENEGRAPH_PATCH_VERSION[ \t]+([0-9]+).*"
"\\1" _osg_VERSION_PATCH ${_osg_Version_contents})
else()
message("[ FindOpenSceneGraph.cmake:${CMAKE_CURRENT_LIST_LINE} ] "
"Failed to parse version number, please report this as a bug")
endif()
set(OPENSCENEGRAPH_VERSION "${_osg_VERSION_MAJOR}.${_osg_VERSION_MINOR}.${_osg_VERSION_PATCH}"
CACHE INTERNAL "The version of OSG which was detected")
if(OpenSceneGraph_DEBUG)
message("[ FindOpenSceneGraph.cmake:${CMAKE_CURRENT_LIST_LINE} ] "
"Detected version ${OPENSCENEGRAPH_VERSION}")
endif()
endif()
#
# Version checking
#
if(OpenSceneGraph_FIND_VERSION AND OPENSCENEGRAPH_VERSION)
if(OpenSceneGraph_FIND_VERSION_EXACT)
if(NOT OPENSCENEGRAPH_VERSION VERSION_EQUAL ${OpenSceneGraph_FIND_VERSION})
set(_osg_version_not_exact TRUE)
endif()
else()
# version is too low
if(NOT OPENSCENEGRAPH_VERSION VERSION_EQUAL ${OpenSceneGraph_FIND_VERSION} AND
NOT OPENSCENEGRAPH_VERSION VERSION_GREATER ${OpenSceneGraph_FIND_VERSION})
set(_osg_version_not_high_enough TRUE)
endif()
endif()
endif()
set(_osg_quiet)
if(OpenSceneGraph_FIND_QUIETLY)
set(_osg_quiet "QUIET")
endif()
#
# Here we call FIND_PACKAGE() on all of the components
#
foreach(_osg_module ${_osg_modules_to_process})
if(OpenSceneGraph_DEBUG)
message("[ FindOpenSceneGraph.cmake:${CMAKE_CURRENT_LIST_LINE} ] "
"Calling find_package(${_osg_module} ${_osg_required} ${_osg_quiet})")
endif()
find_package(${_osg_module} ${_osg_quiet})
string(TOUPPER ${_osg_module} _osg_module_UC)
list(APPEND OPENSCENEGRAPH_INCLUDE_DIR ${${_osg_module_UC}_INCLUDE_DIR})
list(APPEND OPENSCENEGRAPH_LIBRARIES ${${_osg_module_UC}_LIBRARIES})
if(OpenSceneGraph_MARK_AS_ADVANCED)
OSG_MARK_AS_ADVANCED(${_osg_module})
endif()
endforeach()
if(OPENSCENEGRAPH_INCLUDE_DIR)
list(REMOVE_DUPLICATES OPENSCENEGRAPH_INCLUDE_DIR)
endif()
#
# Inform the users with an error message based on
# what version they have vs. what version was
# required.
#
if(OpenSceneGraph_FIND_REQUIRED)
set(_osg_version_output_type FATAL_ERROR)
else()
set(_osg_version_output_type STATUS)
endif()
if(_osg_version_not_high_enough)
set(_osg_EPIC_FAIL TRUE)
if(NOT OpenSceneGraph_FIND_QUIETLY)
message(${_osg_version_output_type}
"ERROR: Version ${OpenSceneGraph_FIND_VERSION} or higher of the OSG "
"is required. Version ${OPENSCENEGRAPH_VERSION} was found.")
endif()
elseif(_osg_version_not_exact)
set(_osg_EPIC_FAIL TRUE)
if(NOT OpenSceneGraph_FIND_QUIETLY)
message(${_osg_version_output_type}
"ERROR: Version ${OpenSceneGraph_FIND_VERSION} of the OSG is required "
"(exactly), version ${OPENSCENEGRAPH_VERSION} was found.")
endif()
else()
#
# Check each module to see if it's found
#
if(OpenSceneGraph_FIND_REQUIRED)
set(_osg_missing_message)
foreach(_osg_module ${_osg_modules_to_process})
string(TOUPPER ${_osg_module} _osg_module_UC)
if(NOT ${_osg_module_UC}_FOUND)
set(_osg_missing_nodekit_fail true)
set(_osg_missing_message "${_osg_missing_message} ${_osg_module}")
endif()
endforeach()
if(_osg_missing_nodekit_fail)
message(FATAL_ERROR "ERROR: Missing the following osg "
"libraries: ${_osg_missing_message}.\n"
"Consider using CMAKE_PREFIX_PATH or the OSG_DIR "
"environment variable. See the "
"${CMAKE_CURRENT_LIST_FILE} for more details.")
endif()
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenSceneGraph DEFAULT_MSG OPENSCENEGRAPH_LIBRARIES OPENSCENEGRAPH_INCLUDE_DIR)
endif()
if(_osg_EPIC_FAIL)
# Zero out everything, we didn't meet version requirements
set(OPENSCENEGRAPH_FOUND FALSE)
set(OPENSCENEGRAPH_LIBRARIES)
set(OPENSCENEGRAPH_INCLUDE_DIR)
endif()
set(OPENSCENEGRAPH_INCLUDE_DIRS ${OPENSCENEGRAPH_INCLUDE_DIR})
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