qt5base-lts/cmake/QtModuleConfig.cmake.in

132 lines
6.3 KiB
CMake
Raw Normal View History

@PACKAGE_INIT@
CMake: Enable NEW policies by CMake version with a global default When a CMake release introduces a new policy that affects most Qt modules, it may be appropriate to make each module aware of that newer CMake version and use the NEW policy without raising the minimum CMake version requirement. To reduce the churn associated with making that change across all Qt modules individually, this change allows it to be updated in a central place (qtbase), but in a way that allows a Qt module to override it in its own .cmake.conf file if required (e.g. to address the issues identified by policy warnings at a later time). The policies are modified at the start of the call to qt_build_repo_begin(). For commands defined by the qtbase module, qtbase needs to be in control of the policy settings at the point where those commands are defined. The above mechanism should not affect the policy settings for these commands, so the various *Config.cmake.in files must not specify policy ranges in a way that a Qt module's .cmake.conf file could influence. Starting with CMake 3.12, policies can be specified as a version range with the cmake_minimum_required() and cmake_policy() commands. All policies introduced in CMake versions up to the upper limit of that range will be set to NEW. The actual version of CMake being used only has to be at least the lower limit of the specified version range. This change uses cmake_minimum_required() rather than cmake_policy() due to the latter not halting further processing upon failure. See the following: https://gitlab.kitware.com/cmake/cmake/-/issues/21557 Task-number: QTBUG-88700 Pick-to: 6.0 Change-Id: I0a1f2611dd629f847a18186394f500d7f52753bc Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
2020-11-30 07:46:49 +00:00
cmake_minimum_required(VERSION @min_new_policy_version@...@max_new_policy_version@)
include(CMakeFindDependencyMacro)
get_filename_component(_import_prefix "${CMAKE_CURRENT_LIST_FILE}" PATH)
get_filename_component(_import_prefix "${_import_prefix}" REALPATH)
# Extra cmake code begin
@extra_cmake_code@
# Extra cmake code end
# Find required dependencies, if any.
if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Dependencies.cmake")
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Dependencies.cmake")
endif()
# If *ConfigDependencies.cmake exists, the variable value will be defined there.
# Don't override it in that case.
if(NOT DEFINED "@INSTALL_CMAKE_NAMESPACE@@target@_FOUND")
set("@INSTALL_CMAKE_NAMESPACE@@target@_FOUND" TRUE)
endif()
if (NOT QT_NO_CREATE_TARGETS AND @INSTALL_CMAKE_NAMESPACE@@target@_FOUND)
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Targets.cmake")
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@AdditionalTargetInfo.cmake")
if(NOT QT_NO_CREATE_VERSIONLESS_TARGETS)
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@VersionlessTargets.cmake")
endif()
# DEPRECATED
# Provide old style variables for includes, compile definitions, etc.
# These variables are deprecated and only provided on a best-effort basis to facilitate porting.
# Consider using target_link_libraries(app PRIVATE @QT_CMAKE_EXPORT_NAMESPACE@@target@) instead.
set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_LIBRARIES "@QT_CMAKE_EXPORT_NAMESPACE@::@target@")
get_target_property(_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_INCLUDE_DIRS
@QT_CMAKE_EXPORT_NAMESPACE@::@target@ INTERFACE_INCLUDE_DIRECTORIES)
if(NOT _@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_INCLUDE_DIRS)
set(_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_INCLUDE_DIRS "")
endif()
if(TARGET @QT_CMAKE_EXPORT_NAMESPACE@::@target@Private)
get_target_property(_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_PRIVATE_INCLUDE_DIRS
@QT_CMAKE_EXPORT_NAMESPACE@::@target@Private INTERFACE_INCLUDE_DIRECTORIES)
if(NOT _@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_PRIVATE_INCLUDE_DIRS)
set(_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_PRIVATE_INCLUDE_DIRS "")
endif()
endif()
get_target_property(@QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS
@QT_CMAKE_EXPORT_NAMESPACE@::@target@ INTERFACE_COMPILE_DEFINITIONS)
if(NOT @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS)
set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS "")
else()
list(TRANSFORM @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS PREPEND "-D")
endif()
get_target_property(@QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS
@QT_CMAKE_EXPORT_NAMESPACE@::@target@ INTERFACE_COMPILE_DEFINITIONS)
if(NOT @QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS)
set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS "")
endif()
set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_INCLUDE_DIRS
${_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_INCLUDE_DIRS})
set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_PRIVATE_INCLUDE_DIRS
${_@QT_CMAKE_EXPORT_NAMESPACE@@target@_OWN_PRIVATE_INCLUDE_DIRS})
foreach(_module_dep ${_@QT_CMAKE_EXPORT_NAMESPACE@@target@_MODULE_DEPENDENCIES})
list(APPEND @QT_CMAKE_EXPORT_NAMESPACE@@target@_INCLUDE_DIRS
${@QT_CMAKE_EXPORT_NAMESPACE@${_module_dep}_INCLUDE_DIRS})
list(APPEND @QT_CMAKE_EXPORT_NAMESPACE@@target@_PRIVATE_INCLUDE_DIRS
${@QT_CMAKE_EXPORT_NAMESPACE@${_module_dep}_PRIVATE_INCLUDE_DIRS})
list(APPEND @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS
${@QT_CMAKE_EXPORT_NAMESPACE@${_module_dep}_DEFINITIONS})
list(APPEND @QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS
${@QT_CMAKE_EXPORT_NAMESPACE@${_module_dep}_COMPILE_DEFINITIONS})
endforeach()
list(REMOVE_DUPLICATES @QT_CMAKE_EXPORT_NAMESPACE@@target@_INCLUDE_DIRS)
list(REMOVE_DUPLICATES @QT_CMAKE_EXPORT_NAMESPACE@@target@_PRIVATE_INCLUDE_DIRS)
list(REMOVE_DUPLICATES @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS)
list(REMOVE_DUPLICATES @QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS)
Write find_dependency() calls in Qt Module config files This change introduces a new function called qt_find_package() which can take an extra option called PROVIDED_TARGETS, which associates targets with the package that defines those targets. This is done by setting the INTERFACE_QT_PACKAGE_NAME and INTERFACE_QT_PACKAGE_VERSION properties on the imported targets. This information allows us to generate appropriate find_dependency() calls in a module's Config file for third party libraries. For example when an application links against QtCore, it should also link against zlib and atomic libraries. In order to do that, the library locations first have to be found by CMake. This is achieved by embedding find_dependency(ZLIB) and find_dependency(Atomic) in Qt5CoreDependencies.cmake which is included by Qt5CoreConfig.cmake. The latter is picked up when an application project contains find_package(Qt5Core), and thus all linking dependencies are resolved. The information 'which package provides which targets' is contained in the python json2cmake conversion script. The generated output of the script contains qt_find_package() calls that represent that information. The Qt5CoreDependencies.cmake file and which which dependencies it contains is generated at the QtPostProcess stop. Note that for non-static Qt builds, we only need to propagate public 3rd party libraries. For static builds, we need all third party libraries. In order for the INTERFACE_QT_PACKAGE_NAME property to be read in any scope, the targets on which the property is set, have to be GLOBAL. Also for applications and other modules to find all required third party libraries, we have to install all our custom Find modules, and make sure they define INTERFACE IMPORTED libraries, and not just IMPORTED libraries. Change-Id: I694d6e32d05b96d5e241df0156fc79d0029426aa Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
2019-04-24 15:14:25 +00:00
endif()
if (TARGET @QT_CMAKE_EXPORT_NAMESPACE@::@target@)
foreach(extra_cmake_include @extra_cmake_includes@)
include("${CMAKE_CURRENT_LIST_DIR}/${extra_cmake_include}")
endforeach()
qt_make_features_available(@QT_CMAKE_EXPORT_NAMESPACE@::@target@)
if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Plugins.cmake")
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Plugins.cmake")
endif()
list(APPEND QT_ALL_MODULES_FOUND_VIA_FIND_PACKAGE "@target@")
get_target_property(_qt_module_target_type "@INSTALL_CMAKE_NAMESPACE@::@target@" TYPE)
if(NOT _qt_module_target_type STREQUAL "INTERFACE_LIBRARY")
get_target_property(_qt_module_plugin_types
@INSTALL_CMAKE_NAMESPACE@::@target@ MODULE_PLUGIN_TYPES)
if(_qt_module_plugin_types)
list(APPEND QT_ALL_PLUGIN_TYPES_FOUND_VIA_FIND_PACKAGE "${_qt_module_plugin_types}")
endif()
endif()
# Load Module's BuildInternals should any exist
if (@INSTALL_CMAKE_NAMESPACE@BuildInternals_DIR AND
EXISTS "${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@BuildInternals.cmake")
include("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@BuildInternals.cmake")
endif()
else()
CMake: Improve component / package not found error messages Provide better error messages when a Qt package / component is not found. Mention the location of the expected Config file on the file system, whether it exists Also mention the location of the Config file that was specified by the user when configuring the project or which CMake computed and stored in QtModule_DIR cache var. Mention that a package is not found in case if the main target exposed by that package is not found. If the target is not found, mention that it might be due to QT_NO_CREATE_TARGETS being set to TRUE (when it is set to true). If it is set to true, the assumption is that the target must have been defined by something else before the find_package call (either an earlier find_package call without QT_NO_CREATE_TARGETS set to TRUE or maybe it's the use case of Qt being built together with its examples or it's a super build). Unset _Qt_NOTFOUND_MESSAGE to ensure that the Qt6 not found error message is not spilled into any subsequent find_package(Qt6) calls, causing a cascade of unwarranted warnings / errors. Make sure to unset it only if components were specified, so the message is not shown or unset in any of the recursive find_package(Qt6) calls which is a dependency for regular Qt module packages. This works fine, because find_package(Qt6) calls with components are only done in project code and not done by the transitive dependency code (which looks for Qt6Foo packages directly). Remove some dead code. Pick-to: 6.2 Task-number: QTBUG-95532 Change-Id: Ie93d18e25e33aa0fe9e9da9a60e3d3e4cd6adb58 Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2021-08-02 14:02:04 +00:00
set(@INSTALL_CMAKE_NAMESPACE@@target@_FOUND FALSE)
if(NOT DEFINED @INSTALL_CMAKE_NAMESPACE@@target@_NOT_FOUND_MESSAGE)
set(@INSTALL_CMAKE_NAMESPACE@@target@_NOT_FOUND_MESSAGE
"Target \"@QT_CMAKE_EXPORT_NAMESPACE@::@target@\" was not found. ${@INSTALL_CMAKE_NAMESPACE@@target@_extra_not_found_message}")
if(QT_NO_CREATE_TARGETS)
string(APPEND @INSTALL_CMAKE_NAMESPACE@@target@_NOT_FOUND_MESSAGE
"Possibly due to QT_NO_CREATE_TARGETS being set to TRUE and thus "
"${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Targets.cmake was not "
"included to define the target.")
endif()
endif()
endif()