Suppression by variable name not working

[Simon Large]

In my embedded application I an EEPROM which starts at address 0. To make access easier I create a mapping structure and then map this to address zero. Unsurprisingly cppcheck flags all accesses as nullPointer, which is expected.
#define EEprom (*((EEprom_t *) 0)) Version = eeprom_read_byte(&EEprom.EE_Version);

I tried to suppress these errors in the GUI client by adding a suppression which specifies error Id nullPointer and variable EEprom. Unfortunately it doesn't suppress anything.

If I remove the variable name from the suppression definition then the supress works, but of course it's dangerous to suppress all nullPointer errors.

Is this a bug or am I doing something wrong?

[Daniel Marjamäki]

Thanks!

hmm.. there is no variable here. It warns about the expression: (EEprom_t*)0. Not sure .. maybe it's ok to set that as variable name.

A workaround could be:

#ifdef __cppcheck__
#define EEprom (*((EEprom_t *) 0x10000))
#else
#define EEprom (*((EEprom_t *) 0))
#endif

And define __cppcheck__ in the Cppcheck analysis.

[Simon Large]

Thanks! Yes, agreed, it's an edge case so I'm happy to use the workaround.

[Daniel Marjamäki]

Or:

#ifdef __cppcheck__
EEprom_t EEprom = {123..};
#else
#define EEprom (*((EEprom_t *) 0))
#endif

Anyway.. I think it would be good to have the option to write a suppression comment for a macro:

#define EEprom (*((EEprom_t *) 0)) // cppcheck-suppress nullPointer

I have created this ticket for that: https://trac.cppcheck.net/ticket/9800