magnum/modules/FindGLFW.cmake

#.rst:
# Find GLFW
# ---------
#
# Finds the GLFW library using its cmake config if that exists, otherwise
# falls back to finding it manually. This module defines:
#
#  GLFW_FOUND               - True if GLFW library is found
#  GLFW::GLFW               - GLFW imported target
#
# Additionally, in case the config was not found, these variables are defined
# for internal usage:
#
#  GLFW_LIBRARY             - GLFW library
#  GLFW_INCLUDE_DIR         - Root include dir
#

#
#   This file is part of Magnum.
#
#   Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
#             Vladimír Vondruš <mosra@centrum.cz>
#   Copyright © 2016 Jonathan Hale <squareys@googlemail.com>
#
#   Permission is hereby granted, free of charge, to any person obtaining a
#   copy of this software and associated documentation files (the "Software"),
#   to deal in the Software without restriction, including without limitation
#   the rights to use, copy, modify, merge, publish, distribute, sublicense,
#   and/or sell copies of the Software, and to permit persons to whom the
#   Software is furnished to do so, subject to the following conditions:
#
#   The above copyright notice and this permission notice shall be included
#   in all copies or substantial portions of the Software.
#
#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
#   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
#   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
#   DEALINGS IN THE SOFTWARE.
#

# Glfw installs cmake package config files to shared/ folder which handles dependencies
# in case glfw is built statically.
find_package(glfw3 CONFIG)

if(TARGET glfw)
    if(NOT TARGET GLFW::GLFW)
        # The glfw cmake config defines the imported target "glfw" we alias it to unify
        # imported target names.
        # TODO: Cannot create alias of imported target
        add_library(GLFW::GLFW UNKNOWN IMPORTED)
        get_target_property(_GLFW_IMPORTED_CONFIGURATIONS glfw IMPORTED_CONFIGURATIONS)
        get_target_property(_GLFW_IMPORTED_LOCATION_RELEASE glfw IMPORTED_LOCATION_RELEASE)
        get_target_property(_GLFW_IMPORTED_LOCATION_DEBUG glfw IMPORTED_LOCATION_DEBUG)
        get_target_property(_GLFW_INTERFACE_INCLUDE_DIRECTORIES glfw INTERFACE_INCLUDE_DIRECTORIES)
        get_target_property(_GLFW_INTERFACE_LINK_LIBRARIES glfw INTERFACE_LINK_LIBRARIES)

        if(NOT _GLFW_INTERFACE_LINK_LIBRARIES)
            # This is fine on systems where there are no additional libraries apart from glfw itself
            # but prevent trying to link _GLFW_INTERFACE_LINK_LIBRARIES-NOTFOUND.lib on Windows.
            set(_GLFW_INTERFACE_LINK_LIBRARIES "")
        endif()

        set_target_properties(GLFW::GLFW PROPERTIES
            INTERFACE_INCLUDE_DIRECTORIES "${_GLFW_INTERFACE_INCLUDE_DIRECTORIES}/GLFW"
            INTERFACE_LINK_LIBRARIES "${_GLFW_INTERFACE_LINK_LIBRARIES}"
            IMPORTED_CONFIGURATIONS "${_GLFW_IMPORTED_CONFIGURATIONS}")
        if(_GLFW_IMPORTED_LOCATION_RELEASE)
            set_target_properties(GLFW::GLFW PROPERTIES
                IMPORTED_LOCATION_RELEASE ${_GLFW_IMPORTED_LOCATION_RELEASE})
        endif()
        if(_GLFW_IMPORTED_LOCATION_DEBUG)
            set_target_properties(GLFW::GLFW PROPERTIES
                IMPORTED_LOCATION_DEBUG ${_GLFW_IMPORTED_LOCATION_DEBUG})
        endif()
    endif()

    find_package_handle_standard_args("GLFW" DEFAULT_MSG
        _GLFW_INTERFACE_INCLUDE_DIRECTORIES)
else()
    # In case no config file was found, try manually finding the library.
    find_library(GLFW_LIBRARY NAMES glfw glfw3)

    # Include dir
    find_path(GLFW_INCLUDE_DIR
        NAMES GLFW/glfw3.h)

    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args("GLFW" DEFAULT_MSG
        GLFW_LIBRARY
        GLFW_INCLUDE_DIR)

    if(NOT TARGET GLFW::GLFW)
        # CMake 3.0 doesn't propagate the local target as dependency upwards
        # the tree and then complains that GLFW::GLFW target was not found,
        # which it shouldn't. This is reproducible with the base bootstrap
        # project *and* when using Magnum as CMake subproject. Works with both
        # 2.8.12 and 3.1, so I'm assuming this is a CMake 3.0 bug. The
        # workaround is to make the target GLOBAL so it's propagated upwards
        # the tree unconditionally. For some reason, UNKNOWN targets can't be
        # marked as GLOBAL, so I'm  biting the bullet and saying the library is
        # shared -- CMake 3.0 is only on Debian Jessie now and I'm assuming GLFW
        # comes from system package, which *should be* shared. Hopefully this won't
        # bite back in the future.
        if(CMAKE_VERSION VERSION_GREATER "2.8.12.2" AND CMAKE_VERSION VERSION_LESS "3.1.0")
            set(_GLFW_IMPORTED_LIBRARY_KIND SHARED IMPORTED GLOBAL)
        else()
            set(_GLFW_IMPORTED_LIBRARY_KIND UNKNOWN IMPORTED)
        endif()
        add_library(GLFW::GLFW ${_GLFW_IMPORTED_LIBRARY_KIND})

        # Work around BUGGY framework support on OSX
        # https://cmake.org/Bug/view.php?id=14105
        if(CORRADE_TARGET_APPLE AND ${GLFW_LIBRARY} MATCHES "\\.framework$")
            set_property(TARGET GLFW::GLFW PROPERTY IMPORTED_LOCATION ${GLFW_LIBRARY}/GLFW)
        else()
            set_property(TARGET GLFW::GLFW PROPERTY IMPORTED_LOCATION ${GLFW_LIBRARY})
        endif()

        set_property(TARGET GLFW::GLFW PROPERTY
            INTERFACE_INCLUDE_DIRECTORIES ${GLFW_INCLUDE_DIR})
    endif()

    mark_as_advanced(GLFW_LIBRARY GLFW_INCLUDE_DIR)
endif()