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SDCC Manual 8.2 ANSI-Compliance The latest publicly available version of the standard ISO/IEC 9899 - Programming languages - C should be available at: http://www.open-std.org/jtc1/sc22/wg14/www/standards.html#9899. Deviations from the compliance: functions are not reentrant unless explicitly declared as such or the --stack-auto command line option is specified. structures and unions 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) /* invalid in SDCC although allowed in ANSI */  {       struct s rets;       ...       return rets; /* is invalid in SDCC although allowed in ANSI */   } initialization of structure arrays must be fully braced. struct s { char x } a[] = {1, 2};     /* invalid in SDCC */  struct s { char x } a[] = {{1}, {2}}; /* OK */ 'long long' (64 bit integers) not supported. 'double' precision floating point not supported. Old K&R style function declarations are NOT allowed. foo(i,j) /* this old style of function declarations */   int i,j; /* is valid in ANSI but not valid in SDCC */   {       ...   } Most enhancements in C99 are not supported, e.g.: for (int i=0; i<10; i++) /* is invalid in SDCC although allowed in C99 */ But some have been added recently in SDCC 2.7.0. They must be considered alpha quality however. inline int increment (int a) { return a+1; } /* inlines the increment without function call overhead */  int * restrict p; /* accepted but ignored */ Certain words that are valid identifiers in the standard may be reserved words in SDCC unless the --std-c89 or --std-c99 command line options are used. These may include (depending on the selected processor): 'at', 'banked', 'bit', 'code', 'critical', 'data', 'eeprom', 'far', 'flash', 'idata', 'interrupt', 'near', 'nonbanked', 'pdata', 'reentrant', 'sbit', 'sfr', 'shadowregs', 'sram', 'using', 'wparam', 'xdata', '_overlay', '_asm', '_endasm', and '_naked'. Compliant equivalents of these keywords are always available in a form that begin with two underscores, f.e. '__data' instead of 'data'. Integer promotion of variable arguments is not performed if the argument is explicitly taypecasted unless the --std-c89 or --std-c99 command line options are used. void vararg_func (char *str, ...) { str; }    void main (void)  {    char c = 10;      /* argument u is promoted to int before     * passing to function */    vararg_func (%c, c);      /* argument u is not promoted to int,     * it is passed as char to function     * if -std-cXX is not defined;     * is promoted to int before passing     * to function if -std-cXX is defined */    vararg_func (%bc, (char)u);  }