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MISRA C:2023 Rule 8.10

An inline function shall be declared with the static storage class

Since R2024a

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Description

Rule Definition

An inline function shall be declared with the static storage class.

Rationale

If you call an inline function that is declared with external linkage but not defined in the same translation unit, the function might not be inlined. You might not see the reduction in execution time that you expect from inlining.

If you want to make an inline function available to several translation units, you can still define it with the static specifier. In this case, place the definition in a header file. Include the header file in all the files where you want the function inlined.

Polyspace Implementation

The rule checker flags definitions that contain the inline specifier without an accompanying static specifier.

Troubleshooting

If you expect a rule violation but do not see it, refer to Diagnose Why Coding Standard Violations Do Not Appear as Expected.

Examples

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inline double mult(int val);
inline double mult(int val) {   /* Non compliant */
    return val * 2.0;
}

static inline double div(int val);
static inline double div(int val) {  /* Compliant */
    return val / 2.0;
}

In this example, the definition of mult is noncompliant because it is inlined without the static storage specifier.

Check Information

Group: Declarations and Definitions
Category: Required
AGC Category: Required

Version History

Introduced in R2024a

See Also

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