Modify the default behavior of Qt's CMake API.
The command is defined in the
Core component of the
Qt6 package, which can be loaded like so:
find_package(Qt6 REQUIRED COMPONENTS Core)
This command was introduced in Qt 6.5.
qt_policy( [SET <policy_name> behavior] [GET <policy_name> <variable>] )
If versionless commands are disabled, use
qt6_policy() instead. It supports the same set of arguments as this command.
This command has two modes:
- When the
SETkeyword 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.
- When the
GETkeyword is used,
<variable>is set to the current behavior for the policy, i.e.
<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:
NEWto opt into the new behavior
OLDto explicitly opt-out of it
OLD behavior of a policy is deprecated, and may be removed in the future.
See also qt_standard_project_setup.
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