HP 3000 Manuals HP 3000 Manuals
Scope of extern Declarations Identifiers for objects and functions declared within a block and with the storage class extern have the same linkage as any visible declaration with file scope. If there is no visible declaration with file scope, the identifier has external linkage, and the definition remains visible until the end of the translation unit. However, because this is an extension to ANSI C, a warning will be issued on subsequent uses of the identifier if the absence of this extended visibility could cause a change in behavior on a port to another conforming implementation.