| cmake_policy(SET CMP0057 NEW) | |
| project(ProjectA C C C) | |
| project(ProjectB C C CXX CXX) | |
| get_property(langs GLOBAL PROPERTY ENABLED_LANGUAGES) | |
| foreach(lang C CXX) | |
| if(NOT lang IN_LIST langs) | |
| message(FATAL_ERROR "Expected language '${lang}' to be enabled.") | |
| endif() | |
| endforeach() |