LANG.PREPROC.PASTEHASH : ## Follows # Operator

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CodeSonar^® 9.2p0

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LANG.PREPROC.PASTEHASH : ## Follows # Operator

Summary

An application of the # operator in a macro definition is immediately followed by an application of the ## operator.

Properties

MisraC2025

MisraC2025:20.11

A macro parameter immediately following a # operator shall not immediately be followed by a ## operator

MisraC2023

MisraC2023:20.11

A macro parameter immediately following a # operator shall not immediately be followed by a ## operator

Misra2012

Misra2012:20.11

A macro parameter immediately following a # operator shall not immediately be followed by a ## operator

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:M16-3-1

There shall be at most one occurrence of the # or ## operators in a single macro definition.

MisraC++2023

MisraC++2023:19.3.2

A macro parameter immediately following a # operator shall not immediately be followed by a ## operator

CWE

CWE:710

Improper Adherence to Coding Standards

CERT-C

CERT-C:PRE30-C

Do not create a universal character name through concatenation

POW10

POW10:8

Limit the use of the preprocessor to file inclusion and simple macros.

JPL

JPL:20

Make only very limited use of the C pre-processor.

Example

#define A( x, y ) #x ## y  /* '## Follows # Operator' warning issued here.
                            * (also 'Macro Uses # Operator' and
                            * 'Macro Uses ## Operator' warnings, when enabled)
                            */


#define B( x, y ) #x x+y ## y         /* ## does not directly follow #.
                                       * ('Macro Uses # Operator' and
                                       * 'Macro Uses ## Operator' warnings only, when enabled)
                                       */

Relevant Configuration File Parameters

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