4.6 ANSI-Compliance

Deviations from the compliancy.

• functions are not always reentrant.
• structures cannot be assigned values directly, cannot be passed as function parameters or assigned to each other and cannot be a return value from a function, e.g.: 
   
  struct s { ... };  
  struct s s1, s2;  
  foo()  
  {  
      ...  
      s1 = s2 ; /* is invalid in SDCC although allowed in ANSI */  
      ...  
  } 
  struct s foo1 (struct s parms) /* is invalid in SDCC although allowed in ANSI */  
  {  
      struct s rets;  
      ...  
      return rets;/* is invalid in SDCC although allowed in ANSI */  
  }
• 'long long' (64 bit integers) not supported.
• 'double' precision floating point not supported.
• No support for setjmp and longjmp (for now).
• Old K&R style function declarations are NOT allowed.
   
  foo(i,j) /* this old style of function declarations */  
  int i,j; /* are valid in ANSI but not valid in SDCC */  
  {  
      ...  
  }
• functions declared as pointers must be dereferenced during the call.
   
  int (*foo)(); 
  ...  
  /* has to be called like this */  
  (*foo)(); /* ansi standard allows calls to be made like 'foo()' */