2.8.2 c99

#pragma c99(“implicit” | “no%implicit”)

This pragma controls diagnostics for implicit function declarations. If the c99 pragma value is set to “implicit”, note the use of quotation marks, a warning is generated when the compiler finds an implicit function declaration. If the c99 pragma value is set to “no%implicit”, note the use of quotation marks, the compiler silently accepts implicit function declaration until the pragma value is reset.

The value of the -xc99 option impacts this pragma. If -xc99=all, the pragma is set to #pragma c99(“implicit”) and when -xc99=none, the pragma is set to #pragma c99(“no%implicit”).

This pragma is set to c99=(“implicit”) by default.