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qtbase/cmake/QtModuleConfig.cmake.in
Alexandru Croitor 657525965b CMake: Warn if cmake_minimum_required has an unsupported low version 
Qt6Config.cmake calls cmake_minimum_required to ensure a recent enough
CMake version is used in projects.

That call does not set policies in the calling subdirectory scope,
because find_package introduces a new policy scope.

If a project using Qt has a 'cmake_minimum_required(VERSION 3.1)'
call and is configured with a recent CMake, many policies will
still be set to OLD.

One such policy is CMP0071 (Run AUTOMOC on GENERATED files). The
policy value is queried at generation time rather than at target
definition time, which means we can't influence the policy value
(e.g. inside the implementation of qt_add_executable for example)

The inability to influence the policy value for targets created by our
own CMake functions is unfortunate and can lead to issues (in the case
of the above policy to compilation / linker issues).

Record the version of the last cmake_minimum_required call before
the Qt packages are found and error out if the version is lower than
the minimum supported one.

A project can reduce the error into a warning by specifying a
-DQT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT_IN_CMAKE_MIN_REQUIRED=3.xyz
option when configuring the project.
If the option is used and build issues arise, no official support is
given.

All the CMake example projects shipped with Qt specify a minimum
version of 3.16 already (which is the minimum for shared Qt builds),
so it shouldn't be an issue to require that in other user projects as
well.

Implementation wise, we follow the existing pattern to record
what the minimum and computed versions for static and shared Qt
builds are at qtbase configure time.
These are then checked before the Qt6 or QtFoo packages are
find_package'd.

Amends 6518bcc167d47e1c27d082c21551b9a838b04e5d

Pick-to: 6.2
Task-number: QTBUG-95018
Task-number: QTBUG-95832
Change-Id: I1a1d06d82f566c92192a699045127943604c8353
Reviewed-by: Craig Scott <craig.scott@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2021-10-01 14:32:36 +02:00

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6.4 KiB
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@PACKAGE_INIT@
# Used by __qt_internal_warn_if_project_min_cmake_version_is_not_met
if(NOT _qt_project_last_cmake_minimum_required_version)
set(_qt_project_last_cmake_minimum_required_version "${CMAKE_MINIMUM_REQUIRED_VERSION}")
endif()
cmake_minimum_required(VERSION @min_new_policy_version@...@max_new_policy_version@)
include(CMakeFindDependencyMacro)
get_filename_component(_import_prefix "${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("${CMAKE_CURRENT_LIST_DIR}/@INSTALL_CMAKE_NAMESPACE@@target@Dependencies.cmake")
endif()
# If *ConfigDependencies.cmake exists, the variable value will be defined there.
# Don't override it in that case.
if(NOT DEFINED "@INSTALL_CMAKE_NAMESPACE@@target@_FOUND")
set("@INSTALL_CMAKE_NAMESPACE@@target@_FOUND" TRUE)
endif()
if (NOT QT_NO_CREATE_TARGETS)
include("${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)
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()
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()
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