929d9a4ca5
Cmake supports finding OpenGL, even if there is no GLX (for glvnd) or old-style libGL. This change keeps old behavior, but in case, if X11-related OpenGL libraries cannot be found on Linux, it adds logic to check for (and link with) libOpenGL, if it is present. [ChangeLog][QtGui] Allow OpenGL to be found on X11-less Linux systems (using libOpenGL) Change-Id: Iccfeba83292a14081544c64ea8ce24fb52d1ee2f Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
63 lines
2.6 KiB
CMake
63 lines
2.6 KiB
CMake
# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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# We can't create the same interface imported target multiple times, CMake will complain if we do
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# that. This can happen if the find_package call is done in multiple different subdirectories.
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if(TARGET WrapOpenGL::WrapOpenGL)
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set(WrapOpenGL_FOUND ON)
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return()
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endif()
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set(WrapOpenGL_FOUND OFF)
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find_package(OpenGL ${WrapOpenGL_FIND_VERSION})
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if (OpenGL_FOUND)
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set(WrapOpenGL_FOUND ON)
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add_library(WrapOpenGL::WrapOpenGL INTERFACE IMPORTED)
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if(APPLE)
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# On Darwin platforms FindOpenGL sets IMPORTED_LOCATION to the absolute path of the library
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# within the framework. This ends up as an absolute path link flag, which we don't want,
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# because that makes our .prl files un-relocatable.
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# Extract the framework path instead, and use that in INTERFACE_LINK_LIBRARIES,
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# which CMake ends up transforming into a reloctable -framework flag.
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# See https://gitlab.kitware.com/cmake/cmake/-/issues/20871 for details.
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get_target_property(__opengl_fw_lib_path OpenGL::GL IMPORTED_LOCATION)
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if(__opengl_fw_lib_path)
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get_filename_component(__opengl_fw_path "${__opengl_fw_lib_path}" DIRECTORY)
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endif()
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if(NOT __opengl_fw_path)
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# Just a safety measure in case if no OpenGL::GL target exists.
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set(__opengl_fw_path "-framework OpenGL")
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endif()
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find_library(WrapOpenGL_AGL NAMES AGL)
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if(WrapOpenGL_AGL)
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set(__opengl_agl_fw_path "${WrapOpenGL_AGL}")
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endif()
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if(NOT __opengl_agl_fw_path)
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set(__opengl_agl_fw_path "-framework AGL")
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endif()
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target_link_libraries(WrapOpenGL::WrapOpenGL INTERFACE ${__opengl_fw_path})
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target_link_libraries(WrapOpenGL::WrapOpenGL INTERFACE ${__opengl_agl_fw_path})
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else()
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target_link_libraries(WrapOpenGL::WrapOpenGL INTERFACE OpenGL::GL)
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endif()
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elseif(UNIX AND NOT APPLE AND NOT CMAKE_SYSTEM_NAME STREQUAL "Integrity")
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# Requesting only the OpenGL component ensures CMake does not mark the package as
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# not found if neither GLX nor libGL are available. This allows finding OpenGL
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# on an X11-less Linux system.
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find_package(OpenGL ${WrapOpenGL_FIND_VERSION} COMPONENTS OpenGL)
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if (OpenGL_FOUND)
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set(WrapOpenGL_FOUND ON)
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add_library(WrapOpenGL::WrapOpenGL INTERFACE IMPORTED)
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target_link_libraries(WrapOpenGL::WrapOpenGL INTERFACE OpenGL::OpenGL)
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endif()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(WrapOpenGL DEFAULT_MSG WrapOpenGL_FOUND)
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