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A C generic selection expression has a controlling expression whose essential type that differs from its standard type (that is, its type according to the C standard).
Exception: a warning of this class is not triggered when the controlling expression is an integer constant expression that is neither a character constant nor of essentially Boolean type.
| Class Name | Inappropriate Selection Type in C Generic | ||||||
|---|---|---|---|---|---|---|---|
| Significance | style | ||||||
| Mnemonic | LANG.TYPE.CGEN.IST | ||||||
| Categories |
|
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| Availability | Available for C only (not C++). |
||||||
| Enabling | Checks for this warning class are disabled by default,
and require the unnormalized
C ASTs for the project. To enable them, add the following
WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.
RETAIN_UNNORMALIZED_C_AST = Yes WARNING_FILTER += allow class="Inappropriate Selection Type in C Generic" |
Japanese (ja)
int lang_type_cgen_ist(int x){
short s16 = 0;
int rv = 0;
rv += _Generic(s16 + s16, /* 'Inappropriate Selection Type in C Generic' warning issued here.
* - Under C standard, the type of (s16+s16) is signed int.
* - Essential type (per MISRA C 2012) is signed short.
*/
short:0,
default:1);
rv += _Generic(s16, /* ok: standard type == essential type == signed short */
short:0,
default:1);
rv += _Generic(20, /* ok: standard type != essential type (signed int vs signed short),
* but integer constant is an explicit exception case.
*/
short:0,
default:1);
return rv;
}
The following configuration file parameters affect checks for this warning class.