This rule is part of MISRA C++:2023.
MISRA Rule 19.2.2
Category: Required
Analysis Type: Decidable,Single Translation Unit
Amplification
This rule applies after macro replacement has been performed.
Rationale
Undefined behaviour occurs if a #include directive does not use one of the following forms:
#include <filename>
#include "filename"
Example
#include <filename.h> // Compliant
#include "filename.h" // Compliant
#include "./include/cpu.h" // Compliant - filename may include a path
#include another.h // Non-compliant
#define HEADER "filename.h"
#include HEADER // Compliant
#define FILENAME file2.h
#include FILENAME // Non-compliant
#define BASE "base"
#define EXT ".ext"
#include BASE EXT // Non-compliant - expands to an invalid form
// #include "base" ".ext"
// - string concatenation occurs after preprocessing
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