<LANG>_EXTENSIONS

The variations are:

:prop_tgt:C_EXTENSIONS
:prop_tgt:CXX_EXTENSIONS
:prop_tgt:CUDA_EXTENSIONS
:prop_tgt:HIP_EXTENSIONS
:prop_tgt:OBJC_EXTENSIONS
:prop_tgt:OBJCXX_EXTENSIONS

These properties specify whether compiler-specific extensions are requested.

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

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

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