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#### 4.2.8 `__has_c_attribute`

The special operator `__has_c_attribute (`operand`)` may be used in ``#if`' and ``#elif`' expressions in C code to test whether the attribute referenced by its operand is recognized by GCC in attributes using the ``[[]]`' syntax. GNU attributes must be specified with the scope ``gnu`' or ``__gnu__`' with `__has_c_attribute`. When operand designates a supported standard attribute it evaluates to an integer constant of the form `YYYYMM` indicating the year and month when the attribute was first introduced into the C standard, or when the syntax of operands to the attribute was extended in the C standard.