19.13 and Assembly

[misra-c]

The presence of a parenthesised, possibly empty, parameter list in the definition of a macro makes it a function-like macro. See the C90 standard, Section 6.8.3.

This means that all of:

Code:

#define QWER(x) { asm x ASDF #$7F; }
#define QWER(x) { asm ASDF #$7F; }
#define QWER() { asm ASDF #$7F; }

are function-like macros and therefore contain instances of the # preprocessing operator.

The # preprocessing operator must be followed by a parameter (constraint C90 Section 6.8.3.2). Therefore none of the above examples is legal C.