LINK_WARNING_AS_ERROR

.. versionadded:: 4.0

Specify whether to treat warnings on link as errors. If enabled, adds a flag to treat warnings on link as errors. If the :option:cmake --link-no-warning-as-error option is given on the :manual:cmake(1) command line, this property is ignored.

This property takes a :ref:semicolon-separated-list <CMake Language Lists> of the following values:

LINKER: treat the linker warnings as errors.
DRIVER: treat the compiler warnings as errors when used to drive the link step. See the :prop_tgt:COMPILE_WARNING_AS_ERROR target property for more information.

Moreover, for consistency with the :prop_tgt:COMPILE_WARNING_AS_ERROR target property, a boolean value can be specified:

True value: this is equivalent to LINKER and DRIVER values.
False value: deactivate this feature for the target.

This property is not implemented for all linkers. It is silently ignored if there is no implementation for the linker being used. The currently implemented :variable:compiler linker IDs <CMAKE_<LANG>_COMPILER_LINKER_ID> are:

AIX
AppleClang
GNU
GNUgold
LLD
MOLD
MSVC
Solaris

This property is initialized by the value of the variable :variable:CMAKE_LINK_WARNING_AS_ERROR if it is set when a target is created.