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:

Wolfram Language code:

Block[{c}, 
	SetAttributes[c, Constant];
	Compile[{x}, c Sin[x]]
]

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

Wolfram Language code:

cf = Block[{c}, 
	SetAttributes[c, Constant];
	N[c] = 5.7;
	Compile[{x}, c Sin[x]]
]

Wolfram Language code: cf[Pi / 2]

Clear the value of cf:

Wolfram Language code: Clear[cf]

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