LANG.PREPROC.RUNDEF : Macro Undefinition of Reserved Name

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A macro is undefined (with #undef), and its name

starts with an underscore, or

matches the name of a macro defined in a standard C header, or

matches a file-scope identifier declared in a standard C header.

This warning class is a strict subset of Use of #undef.

Class Name

Macro Undefinition of Reserved Name

Significance

style

Mnemonic

LANG.PREPROC.RUNDEF

Categories

MisraC2023	MisraC2023:20.5	#undef should not be used
	MisraC2023:21.1	#define and #undef shall not be used on a reserved identifier or reserved macro name
Misra2012	Misra2012:20.5	#undef should not be used
	Misra2012:21.1	#define and #undef shall not be used on a reserved identifier or reserved macro name
Misra2004	Misra2004:19.6	#undef shall not be used
	Misra2004:20.1	Reserved identifiers, macros and functions in the standard library, shall not be defined, redefined or undefined
AUTOSARC++14	AUTOSARC++14:A16-0-1	The pre-processor shall only be used for unconditional and conditional file inclusion and include guards, and using the following directives: (1) #ifndef, (2) #ifdef, (3) #if, (4) #if defined, (5) #elif, (6) #else, (7) #define, (8) #endif, (9) #include.
	AUTOSARC++14:A17-0-1	Reserved identifiers, macros and functions in the C++ standard library shall not be defined, redefined or undefined.
MisraC++2008	MisraC++2008:16-0-3	#undef shall not be used.
	MisraC++2008:17-0-1	Reserved identifiers, macros and functions in the standard library shall not be defined, redefined or undefined.
JPL	JPL:22	Do not undefine or redefine macros.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Macro Undefinition of Reserved Name"

#undef sprintf   /* 'Macro Undefinition of Reserved Name' warning issued here */

#undef NULL      /* 'Macro Undefinition of Reserved Name' warning issued here */

#undef _mymacro  /* 'Macro Undefinition of Reserved Name' warning issued here */

#undef mymacro                      /* not a reserved name */

The following configuration file parameters affect checks for this warning class.

LANG.PREPROC.RUNDEF : Macro Undefinition of Reserved Name

Summary

Properties

Example

Relevant Configuration File Parameters