qt_policy

Modify the default behavior of Qt's CMake API.

The command is defined in the 核心 组件对于 Qt6 package, which can be loaded like so:

find_package(Qt6 REQUIRED COMPONENTS Core)
					

This command was introduced in Qt 6.5.

概要

qt_policy(
    [SET <policy_name> behavior]
    [GET <policy_name> <variable>]
)
					

若 versionless commands are disabled, use qt6_policy() instead. It supports the same set of arguments as this command.

描述

This command has two modes:

• 当 SET keyword is used, this command can be used to opt in to behavior changes in Qt's CMake API, or to explicitly opt out of them.
• 当 GET keyword is used, <variable> is set to the current behavior for the policy, i.e. OLD or NEW .

<policy_name> must be the name of one of the Qt CMake policies . Policy names have the form of QTP<NNNN> where <NNNN> is an integer specifying the index of the policy. Using an invalid policy name results in an error.

Code supporting older Qt versions can check the existence of a policy by checking the value of the QT_KNOWN_POLICY_<policy_name> variable before getting the value of <policy_name> or setting its behavior.

if(QT_KNOWN_POLICY_<policy_name>)
    qt_policy(SET <policy_name> NEW)
endif()
					

You can set behavior to one of the following options:

• NEW to opt into the new behavior
• OLD to explicitly opt-out of it

注意： The OLD behavior of a policy is deprecated, and may be removed in the future.

另请参阅 qt_standard_project_setup .

内容

• 概要

• 描述