# WINDOWS_EXPORT_ALL_SYMBOLS

This property is implemented only for MS-compatible tools on Windows.

Enable this boolean property to automatically create a module definition (`.def`) file with all global symbols found in the input `.obj` files for a `SHARED` library on Windows. The module definition file will be passed to the linker causing all symbols to be exported from the `.dll`. For global data symbols, `__declspec(dllimport)` must still be used when compiling against the code in the `.dll`. All other function symbols will be automatically exported and imported by callers. This simplifies porting projects to Windows by reducing the need for explicit `dllexport` markup, even in `C++` classes.

This property is initialized by the value of the `CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS` variable if it is set when a target is created.