| CMP0018 |
| ------- |
| |
| Ignore CMAKE_SHARED_LIBRARY_<Lang>_FLAGS variable. |
| |
| CMake 2.8.8 and lower compiled sources in SHARED and MODULE libraries |
| using the value of the undocumented CMAKE_SHARED_LIBRARY_<Lang>_FLAGS |
| platform variable. The variable contained platform-specific flags |
| needed to compile objects for shared libraries. Typically it included |
| a flag such as -fPIC for position independent code but also included |
| other flags needed on certain platforms. CMake 2.8.9 and higher |
| prefer instead to use the POSITION_INDEPENDENT_CODE target property to |
| determine what targets should be position independent, and new |
| undocumented platform variables to select flags while ignoring |
| CMAKE_SHARED_LIBRARY_<Lang>_FLAGS completely. |
| |
| The default for either approach produces identical compilation flags, |
| but if a project modifies CMAKE_SHARED_LIBRARY_<Lang>_FLAGS from its |
| original value this policy determines which approach to use. |
| |
| The OLD behavior for this policy is to ignore the |
| POSITION_INDEPENDENT_CODE property for all targets and use the |
| modified value of CMAKE_SHARED_LIBRARY_<Lang>_FLAGS for SHARED and |
| MODULE libraries. |
| |
| The NEW behavior for this policy is to ignore |
| CMAKE_SHARED_LIBRARY_<Lang>_FLAGS whether it is modified or not and |
| honor the POSITION_INDEPENDENT_CODE target property. |
| |
| This policy was introduced in CMake version 2.8.9. CMake version |
| |release| warns when the policy is not set and uses OLD behavior. Use |
| the cmake_policy command to set it to OLD or NEW explicitly. |
