Synopsis

(Required) Macro identifiers shall be distinct.

Enabled by default

Yes

Severity/Certainty

Low/Medium

Full description

Macro names were found that are not distinct in their first 63 characters from their macro parameters or other macro names.

Coding standards

Code examples

The following code example fails the check and will give a warning:

/*         0        1         2         3         4         5         6     */
/*         123456789012345678901234567890123456789012345678901234567890123* */
#define    n01_macro_hides_macro________________________________________63x 1
#define    n02_param_hides_macro________________________________________63x 1
#define    n03_macro_hides_param________________________________________63x 1

#define    n01_macro_hides_macro________________________________________63y 2
#define m1(n02_param_hides_macro________________________________________63y) \
          (n01_param_hides_macro________________________________________63y + 1)
#define    n03_macro_hides_param________________________________________63y 2

#define m2(n04_param_hides_param________________________________________63x, \
           n04_param_hides_param________________________________________63y) 1

The following code example passes the check and will not give a warning about this issue:

#define m1(n01_param_of_other_macro) (n01_param_hides_macro + 1)
#define m2(n01_param_of_other_macro) (n01_param_hides_macro + 1)