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An identifier declared in different scopes or multiple times within the same scope can be made to refer to the same object or function by _linkage_. An identifier can be classified as _externally linked_, _internally linked_, or _not-linked_. These three kinds of linkage have the following characteristics \[[AA. C References#KirchKirch-Prinz 02]\]: |
- External linkage. An identifier with external linkage represents the same object or function throughout the entire program, that is, in all compilation units and libraries belonging to the program. The identifier is available to the linker. When a second declaration of the same identifier with external linkage occurs, the linker associates the identifier with the same object or function.
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\[[Banahan 03|AA. C References#Banahan 03]\] [Section 8.2, "Declarations, Definitions and Accessibility"|http://publications.gbdirect.co.uk/c_book/chapter8/declarations_and_definitions.html]
\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.2.2, "Linkages of identifiers"
\[[Kirch-Prinz 02|AA. C References#Kirch-Prinz 02]\]
\[[MISRA 04|AA. C References#MISRA 04]\] Rule 8.1 |
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