B.2.16 #pragma unknown_control_flow

#pragma unknown_control_flow(name[,name...])

Use unknown_control_flow to specify a list of routines that violate the usual control flow properties of procedure calls. For example, the statement following a call to setjmp() can be reached from an arbitrary call to any other routine. The statement is reached by a call to longjmp().

Because such routines render standard flowgraph analysis invalid, routines that call them cannot be safely optimized; hence, they are compiled with the optimizer disabled.

If the function name is overloaded, the most recently declared function is chosen.