Microchip Technology XC8 Standard Compiler (Workstation) SW006021-1 SW006021-1 User Manual

 2012 Microchip Technology Inc.

DS52053B-page 397

The code generator has encountered a variable definition whose storage class is 
invalid, for example:

auto int foo; /* auto not permitted with global variables */

int power(static int a)  /* parameters may not be static */

{

  return foo * a;

}

A declaration has conflicting storage classes. Only one storage class should appear in 
a declaration, for example:

extern static int where;  /* so is it static or extern? */

Only one basic type may appear in a declaration, for example:

int float if;  /* is it int or float? */

Only function parameters or auto variables may be declared using the register 
qualifier, for example:

register int gi;      /* this cannot be qualified register */

int process(register int input)  /* this is okay */

{

  return input + gi;

}

Only int and float can be qualified with long.

long char lc;  /* what? */

Only int can be modified with short, for example:

short float sf;  /* what? */

The type modifiers signed and unsigned cannot be used together in the same dec-
laration, as they have opposite meaning, for example:

signed unsigned int confused;  /* which is it? */

A floating-point type cannot be made unsigned, for example:

unsigned float uf;  /* what? */

The ellipsis symbol may only appear as the last item in a prototyped argument list. It 
may not appear on its own, nor may it appear after argument names that do not have 
types; i.e., K&R-style non-prototype function definitions. For example:

/* K&R-style non-prototyped function definition */

int kandr(a, b, ...)

  int a, b;

{