<LANG>_EXTENSIONS — CMake 4.2.6 Documentation

# <LANG>_EXTENSIONS

The variations are:

- `C_EXTENSIONS`

- `CXX_EXTENSIONS`

- `CUDA_EXTENSIONS`

- `HIP_EXTENSIONS`

- `OBJC_EXTENSIONS`

- `OBJCXX_EXTENSIONS`

These properties specify whether compiler-specific extensions are requested.

These properties are initialized by the value of the `CMAKE_<LANG>_EXTENSIONS` variable if it is set when a target is created and otherwise by the value of `CMAKE_<LANG>_EXTENSIONS_DEFAULT` (see `CMP0128`).

For supported CMake versions see the respective pages. To control language standard versions see `<LANG>_STANDARD`.

See the `cmake-compile-features(7)` manual for information on compile features and a list of supported compilers.