Previous Table of Contents "New C Standard" commentary
420 An identifier declared in different scopes or in the same scope more than once can be made to refer to the same object or function by a process called linkage.21)
421 There are three kinds of linkage: external, internal, and none.
422 In the set of translation units and libraries that constitutes an entire program, each declaration of a particular identifier with external linkage denotes the same object or function.
423 Within one translation unit, each declaration of an identifier with internal linkage denotes the same object or function.
424 Each declaration of an identifier with no linkage denotes a unique entity.
If the declaration of a file scope identifier for an object or a
function contains the storage-class specifier
For an identifier declared with the storage-class specifier
427 21) There is no linkage between different identifiers.
22) A function declaration can contain the storage-class specifier
429 If no prior declaration is visible, or if the prior declaration specifies no linkage, then the identifier has external linkage.
If the declaration of an identifier for a function has no
storage-class specifier, its linkage is determined exactly as if it
were declared with the storage-class specifier
431 If the declaration of an identifier for an object has file scope and no storage-class specifier, its linkage is external.
432 The following identifiers have no linkage:
433 an identifier declared to be anything other than an object or a function;
434 an identifier declared to be a function parameter;
a block scope identifier for an object declared without the
436 If, within a translation unit, the same identifier appears with both internal and external linkage, the behavior is undefined.
437 Forward references: declarations (6.7), expressions (6.5), external definitions (6.9), statements (6.8).
Created at: 2008-01-30 02:39:40
The text from WG14/N1256 is copyright © ISO
Created at: 2008-01-30 02:39:40 The text from WG14/N1256 is copyright © ISO