SEI CERT C Coding Standard

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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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[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 in IEEE Std 1003.1-2008. Wiki Markup<ac:structured-macro ac:name="anchor" ac:schema-version="1" ac:macro-id="878b1a6b-b8f6-4ffe-ae12-d58af1b3715f"><ac:parameter ac:name="">1</ac:parameter></ac:structured-macro> \[1\] Note that the POSIX ^&#xAE;^ 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. Bibliography#IEEE Std 1003.1-2008].

Noncompliant Code Example (Header Guard)

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Noncompliant Code Example (errno)

Wiki MarkupAccording \ [[ISO/IEC 9899-1999|AA. Bibliography#ISO/IEC 9899-1999]\], the behavior of a program is [undefined |BB. Definitions#undefined behavior] when

a macro definition of errno is suppressed in order to access an actual object, or the program defines an identifier with the name errno.

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Tool

Version

Checker

Description

Section

LDRA tool suite

Include Page
c:LDRA_Vc:
LDRA_V

 

 

Section

Compass/ROSE

 

 

 

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