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The FindPackageHandleStandardArgs module was originally created outside of CMake. It was added for CMake 2.6.0 by commite118a627(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 commitb5f656e0(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX modules..., 2007-07-18). Then commitd358cf5c(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 commit5f183caa(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 commitb0118402(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 commitdb44848f(Prefer files from CMAKE_ROOT when including from CMAKE_ROOT, 2010-11-17). That change was followed by commitce28737c(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 commita364daf1(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 commitb0118402(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.
161 lines
5.2 KiB
CMake
161 lines
5.2 KiB
CMake
# - Try to find OpenGL
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# Once done this will define
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#
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# OPENGL_FOUND - system has OpenGL
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# OPENGL_XMESA_FOUND - system has XMESA
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# OPENGL_GLU_FOUND - system has GLU
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# OPENGL_INCLUDE_DIR - the GL include directory
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# OPENGL_LIBRARIES - Link these to use OpenGL and GLU
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#
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# If you want to use just GL you can use these values
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# OPENGL_gl_LIBRARY - Path to OpenGL Library
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# OPENGL_glu_LIBRARY - Path to GLU Library
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#
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# On OSX default to using the framework version of opengl
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# People will have to change the cache values of OPENGL_glu_LIBRARY
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# and OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX
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#=============================================================================
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# Copyright 2001-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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IF (WIN32)
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IF (CYGWIN)
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FIND_PATH(OPENGL_INCLUDE_DIR GL/gl.h )
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FIND_LIBRARY(OPENGL_gl_LIBRARY opengl32 )
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FIND_LIBRARY(OPENGL_glu_LIBRARY glu32 )
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ELSE (CYGWIN)
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IF(BORLAND)
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SET (OPENGL_gl_LIBRARY import32 CACHE STRING "OpenGL library for win32")
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SET (OPENGL_glu_LIBRARY import32 CACHE STRING "GLU library for win32")
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ELSE(BORLAND)
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SET (OPENGL_gl_LIBRARY opengl32 CACHE STRING "OpenGL library for win32")
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SET (OPENGL_glu_LIBRARY glu32 CACHE STRING "GLU library for win32")
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ENDIF(BORLAND)
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ENDIF (CYGWIN)
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ELSE (WIN32)
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IF (APPLE)
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FIND_LIBRARY(OPENGL_gl_LIBRARY OpenGL DOC "OpenGL lib for OSX")
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FIND_LIBRARY(OPENGL_glu_LIBRARY AGL DOC "AGL lib for OSX")
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FIND_PATH(OPENGL_INCLUDE_DIR OpenGL/gl.h DOC "Include for OpenGL on OSX")
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ELSE(APPLE)
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# Handle HP-UX cases where we only want to find OpenGL in either hpux64
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# or hpux32 depending on if we're doing a 64 bit build.
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IF(CMAKE_SIZEOF_VOID_P EQUAL 4)
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SET(HPUX_IA_OPENGL_LIB_PATH /opt/graphics/OpenGL/lib/hpux32/)
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ELSE(CMAKE_SIZEOF_VOID_P EQUAL 4)
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SET(HPUX_IA_OPENGL_LIB_PATH
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/opt/graphics/OpenGL/lib/hpux64/
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/opt/graphics/OpenGL/lib/pa20_64)
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ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 4)
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# The first line below is to make sure that the proper headers
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# are used on a Linux machine with the NVidia drivers installed.
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# They replace Mesa with NVidia's own library but normally do not
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# install headers and that causes the linking to
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# fail since the compiler finds the Mesa headers but NVidia's library.
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# Make sure the NVIDIA directory comes BEFORE the others.
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# - Atanas Georgiev <atanas@cs.columbia.edu>
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FIND_PATH(OPENGL_INCLUDE_DIR GL/gl.h
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/usr/share/doc/NVIDIA_GLX-1.0/include
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/usr/openwin/share/include
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/opt/graphics/OpenGL/include /usr/X11R6/include
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)
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FIND_PATH(OPENGL_xmesa_INCLUDE_DIR GL/xmesa.h
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/usr/share/doc/NVIDIA_GLX-1.0/include
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/usr/openwin/share/include
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/opt/graphics/OpenGL/include /usr/X11R6/include
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)
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FIND_LIBRARY(OPENGL_gl_LIBRARY
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NAMES GL MesaGL
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PATHS /opt/graphics/OpenGL/lib
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/usr/openwin/lib
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/usr/shlib /usr/X11R6/lib
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${HPUX_IA_OPENGL_LIB_PATH}
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)
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# On Unix OpenGL most certainly always requires X11.
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# Feel free to tighten up these conditions if you don't
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# think this is always true.
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# It's not true on OSX.
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IF (OPENGL_gl_LIBRARY)
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IF(NOT X11_FOUND)
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INCLUDE(FindX11)
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ENDIF(NOT X11_FOUND)
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IF (X11_FOUND)
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IF (NOT APPLE)
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SET (OPENGL_LIBRARIES ${X11_LIBRARIES})
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ENDIF (NOT APPLE)
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ENDIF (X11_FOUND)
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ENDIF (OPENGL_gl_LIBRARY)
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FIND_LIBRARY(OPENGL_glu_LIBRARY
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NAMES GLU MesaGLU
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PATHS ${OPENGL_gl_LIBRARY}
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/opt/graphics/OpenGL/lib
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/usr/openwin/lib
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/usr/shlib /usr/X11R6/lib
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)
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ENDIF(APPLE)
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ENDIF (WIN32)
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IF(OPENGL_gl_LIBRARY)
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IF(OPENGL_xmesa_INCLUDE_DIR)
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SET( OPENGL_XMESA_FOUND "YES" )
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ELSE(OPENGL_xmesa_INCLUDE_DIR)
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SET( OPENGL_XMESA_FOUND "NO" )
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ENDIF(OPENGL_xmesa_INCLUDE_DIR)
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SET( OPENGL_LIBRARIES ${OPENGL_gl_LIBRARY} ${OPENGL_LIBRARIES})
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IF(OPENGL_glu_LIBRARY)
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SET( OPENGL_GLU_FOUND "YES" )
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SET( OPENGL_LIBRARIES ${OPENGL_glu_LIBRARY} ${OPENGL_LIBRARIES} )
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ELSE(OPENGL_glu_LIBRARY)
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SET( OPENGL_GLU_FOUND "NO" )
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ENDIF(OPENGL_glu_LIBRARY)
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# This deprecated setting is for backward compatibility with CMake1.4
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SET (OPENGL_LIBRARY ${OPENGL_LIBRARIES})
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ENDIF(OPENGL_gl_LIBRARY)
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# This deprecated setting is for backward compatibility with CMake1.4
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SET(OPENGL_INCLUDE_PATH ${OPENGL_INCLUDE_DIR})
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# handle the QUIETLY and REQUIRED arguments and set OPENGL_FOUND to TRUE if
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# all listed variables are TRUE
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INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(OpenGL DEFAULT_MSG OPENGL_gl_LIBRARY)
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MARK_AS_ADVANCED(
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OPENGL_INCLUDE_DIR
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OPENGL_xmesa_INCLUDE_DIR
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OPENGL_glu_LIBRARY
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OPENGL_gl_LIBRARY
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)
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