MISRAC++2008-9-6-2
In this section:
Synopsis
(Required) Bit-fields shall be either bool type or an explicitly unsigned or signed integral type.
Enabled by default
Yes
Severity/Certainty
Medium/Medium

Full description
Bitfields of plain int type were found.
Coding standards
This check does not correspond to any coding standard rules.
Code examples
The following code example fails the check and will give a warning:
struct bad {
int x:3;
};
The following code example passes the check and will not give a warning about this issue:
struct good {
unsigned int x:3;
};