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59 lines
3.1 KiB
CMake
59 lines
3.1 KiB
CMake
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# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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function(qt_create_nolink_target target dependee_target)
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if(NOT TARGET "${target}")
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message(FATAL_ERROR "${target} does not exist when trying to build a nolink target.")
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endif()
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get_target_property(type "${target}" TYPE)
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if(type STREQUAL EXECUTABLE)
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message(FATAL_ERROR "${target} must be a library of some kind.")
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endif()
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if(type STREQUAL OBJECT_LIBRARY)
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message(FATAL_ERROR "${target} must not be an object library.")
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endif()
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# Strip off the namespace prefix, so from Vulkan::Vulkan to Vulkan, and then append _nolink.
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string(REGEX REPLACE "^.*::" "" non_prefixed_target ${target})
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set(nolink_target "${non_prefixed_target}_nolink")
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# Create the nolink interface target, assign the properties from the original target,
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# associate the nolink target with the same export which contains
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# the target that uses the _nolink target.
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# Also create a namespaced alias of the form ${target}::${target}_nolink which is used by
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# our modules.
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# Also create a Qt namespaced alias target, because when exporting via install(EXPORT)
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# Vulkan::Vulkan_nolink transforms into Qt6::Vulkan_nolink, and the latter needs to be an
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# accessible alias for standalone tests.
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if(NOT TARGET "${nolink_target}")
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add_library("${nolink_target}" INTERFACE)
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set(prefixed_nolink_target "${target}_nolink")
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# When configuring an example with qmake, if QtGui is built with Vulkan support but the
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# user's machine where Qt is installed doesn't have Vulkan, qmake doesn't fail saying
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# that vulkan is not installed. Instead it silently configures and just doesn't add
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# the include headers.
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# To mimic that in CMake, if the Vulkan CMake package is not found, we shouldn't fail
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# at generation time saying that the Vulkan target does not exist. Instead check with a
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# genex that the target exists to query the properties, otherwise just silently continue.
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# FIXME: If we figure out that such behavior should only be applied to Vulkan, and not the
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# other _nolink targets, we'll have to modify this to be configurable.
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set(target_exists_genex "$<TARGET_EXISTS:${target}>")
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set(props_to_set INTERFACE_INCLUDE_DIRECTORIES INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
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INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_OPTIONS
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INTERFACE_COMPILE_FEATURES)
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foreach(prop ${props_to_set})
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set_target_properties(
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"${nolink_target}" PROPERTIES
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${prop} $<${target_exists_genex}:$<TARGET_PROPERTY:${target},${prop}>>
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)
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endforeach()
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add_library(${prefixed_nolink_target} ALIAS ${nolink_target})
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add_library("${INSTALL_CMAKE_NAMESPACE}::${nolink_target}" ALIAS ${nolink_target})
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set(export_name "${INSTALL_CMAKE_NAMESPACE}${dependee_target}Targets")
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qt_install(TARGETS ${nolink_target} EXPORT ${export_name})
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endif()
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endfunction()
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