CMP0047

Warning

The OLD behavior of this policy was removed in CMake version 4.0. This policy must be set to NEW by a call to cmake_minimum_required() or cmake_policy().

Use QCC compiler id for the qcc drivers on QNX.

CMake 3.0 and above recognize that the QNX qcc compiler driver is different from the GNU compiler. CMake now prefers to present this to projects by setting the CMAKE_<LANG>_COMPILER_ID variable to QCC instead of GNU. However, existing projects may assume the compiler id for QNX qcc is just GNU as it was in CMake versions prior to 3.0. Therefore this policy determines for QNX qcc which compiler id to report in the CMAKE_<LANG>_COMPILER_ID variable after language <LANG> is enabled by the project() or enable_language() command. The policy must be set prior to the invocation of either command.

The OLD behavior for this policy is to use the GNU compiler id for the qcc and QCC compiler drivers. The NEW behavior for this policy is to use the QCC compiler id for those drivers.

This policy was introduced in CMake version 3.0. Prior to removal in CMake version 4.0, it could be set by cmake_policy() or cmake_minimum_required(). If it was not set, CMake did not warn by default, and used OLD behavior.

See documentation of the CMAKE_POLICY_WARNING_CMP0047 variable to control the warning in CMake versions before 4.0.