Details

This message is generated when an expression to be compiled contains a symbol with the Constant attribute that does not evaluate to a number and does not have any rules for computing numerical approximations using N. If a symbol to be compiled must have the Constant attribute, compilation can proceed without error if the symbol also has a rule for numerical approximation using N.
Off[message] switches off the message; On[message] switches it on. For example: Off[Compile::ccon].

Examples

There is a symbol to be compiled that has the Constant attribute but no NValues:

The numerical value of the constant is incorporated into the resulting expression:

Clear the value of cf:

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