| CMP0155 |
| ------- |
| |
| .. versionadded:: 3.28 |
| |
| C++ sources in targets with at least C++20 are scanned for imports |
| when supported. |
| |
| CMake 3.27 and below assume that C++ sources do not ``import`` modules. |
| CMake 3.28 and above prefer to assume that C++ sources in targets using C++20 |
| or higher might ``import`` modules, and must be scanned before compiling, |
| unless explicitly disabled. This policy provides compatibility for projects |
| that use C++20 or higher, without modules, that have not been updated to turn |
| off scanning, e.g., via the :variable:`CMAKE_CXX_SCAN_FOR_MODULES` variable. |
| See the :manual:`cmake-cxxmodules(7)` manual for more details on C++ module |
| support. |
| |
| The ``OLD`` behavior for this policy is to assume that C++ 20 and newer |
| sources do not import modules. The ``NEW`` behavior for this policy is to |
| assume that C++ 20 and newer files may import modules if the compiler |
| understands how to scan for their dependencies, and need to be scanned. |
| |
| .. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.28 |
| .. |WARNS_OR_DOES_NOT_WARN| replace:: does *not* warn |
| .. include:: STANDARD_ADVICE.txt |
| |
| .. include:: DEPRECATED.txt |
