compilers: Add docstring for Compiler.get_define

mesonbuild/compilers/compilers.py

@@ -532,6 +532,19 @@ def get_define(self, dname: str, prefix: str, env: 'Environment',
                    extra_args: T.Union[T.List[str], T.Callable[[CompileCheckMode], T.List[str]]],
                    dependencies: T.List['Dependency'],
                    disable_cache: bool = False) -> CompileCheckResult[T.Optional[str]]:
+        """Get the value of a given pre-processor define.
+
+        This is only used by languages that use a pre-processor, like the C family.
+
+        :param dname: The type whose members will be checked
+        :param prefix: A preamble to add to the top of the generated test code
+        :param env: The Meson Environment
+        :param extra_args: Any extra arguments to pass to the check, defaults to None
+        :param dependencies: A list of Meson Dependency objects, defaults to None
+        :param disable_cache: Skip the cache. Default: False
+        :raises EnvironmentException: If the given compiler does not implement this check
+        :return: a :class:`CompileCheckResult[str | None]`
+        """
         raise EnvironmentException('%s does not support get_define ' % self.get_id())
 
     def compute_int(self, expression: str, low: T.Optional[int], high: T.Optional[int],