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No other identifiers are reserved #1. The behavior of a program that declares or defines an identifier in a context in which it is reserved or defines a reserved identifier as a macro name, is undefined . See also undefined behavior 100 of Annex J of C99. Trying to define a reserved identifier can result in its name conflicting with that used in implementation, which may or may not be detected at compile time.
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<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="4fff1a4e-917a-453b-af04-ba193d0a83d0"><ac:parameter ac:name="">1</ac:parameter></ac:structured-macro> \[1\] Note that the POSIX ^®^ standard extends the set of identifiers reserved by C99 to include an open-ended set of its own. See section [2.2 Compilation Environment|http://www.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_02] in [\[IEEE Std 1003.1-2008\]|AA. References#IEEE Std 1003.1-2008]. |
Noncompliant Code Example (Header Guard)
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\[[ISO/IEC 9899:1999|AA. References#ISO/IEC 9899-1999]\] Section 7.1.3, "Reserved Identifiers"
[\[IEEE Std 1003.1-2008\]|AA. References#IEEE Std 1003.1-2008] Section 2.2 "The Compilation Environment" |
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