| PCH_WARN_INVALID | |
| ---------------- | |
| When this property is set to true, the precompile header compiler options | |
| will contain a compiler flag which should warn about invalid precompiled | |
| headers e.g. ``-Winvalid-pch`` for GNU compiler. | |
| This property is initialized by the value of the | |
| :variable:`CMAKE_PCH_WARN_INVALID` variable if it is set when a target is | |
| created. If that variable is not set, the property defaults to ``ON``. |