@@ -9867,6 +9867,22 @@ foo (int x, int y)
@code{y} is not actually incremented and the compiler can but does not
have to optimize it to just @code{return 42 + 42;}.
+@cindex @code{musttail} statement attribute
+@item musttail
+
+The @code{gnu::musttail} or @code{clang::musttail} attribute
+can be applied to a return statement that returns the value
+of a call to indicate that the call must be a tail call
+that does not allocate extra stack space.
+
+@smallexample
+[[gnu::musttail]] return foo();
+@end smallexample
+
+If the compiler cannot generate a tail call it will generate
+an error. Tail calls generally require enabling optimization.
+On some targets they may not be supported.
+
@end table
@node Attribute Syntax