5.5 and groups of preprocessing

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5.5 and groups of preprocessing

Post by lovewar » Tue Nov 03, 2015 6:44 am

such as

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#ifndef NO_TAG
static void log (const char *format, ...)
#if defined(__STDC_VERSION__)
#define log(...) do { } while (0)    // here
and, the identifier(log) exists after preprocssing has been performed:

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static void log (const char *format, ...)   // does it apply to #define log ?
I have a question regarding rule 5.5: does the function(log) apply to #define log ?

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Re: 5.5 and groups of preprocessing

Post by misra-c » Thu Nov 26, 2015 10:30 am

Rule 5.5 amplification states that
name of macros that exist prior to preprocessing
be distinct from
identifiers that exist after preprocessing.
Prior to preprocessing there is a macro called "log".

If the code is compiled when NO_TAG is not defined, the code after preprocessing will include a function identifier "log". Under these circumstances, there is a violation of rule 5.5.
Posted by and on behalf of
the MISRA C Working Group

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