ALLOW_DUPLICATE_CUSTOM_TARGETS — CMake 3.24.1 Documentation

# ALLOW_DUPLICATE_CUSTOM_TARGETS

Allow duplicate custom targets to be created.

Normally CMake requires that all targets built in a project have globally unique logical names (see policy `CMP0002`). This is necessary to generate meaningful project file names in `Xcode` and Visual Studio Generators IDE generators. It also allows the target names to be referenced unambiguously.

Makefile generators are capable of supporting duplicate `add_custom_target()` names. For projects that care only about Makefile Generators and do not wish to support `Xcode` or Visual Studio Generators IDE generators, one may set this property to `True` to allow duplicate custom targets. The property allows multiple `add_custom_target()` command calls in different directories to specify the same target name. However, setting this property will cause non-Makefile generators to produce an error and refuse to generate the project.