Hi,
I have the following C code which gives the compiler
error.
"error: initializer element is not a constant"
#define COMPILE_HOUR (((__TIME__[0]-'0')*10) +
(__TIME__[1]-'0'))
#define COMPILE_MINUTE (((__TIME__[3]-'0')*10) +
(__TIME__[4]-'0'))
#define COMPILE_SECOND (((__TIME__[6]-'0')*10) +
(__TIME__[7]-'0'))
const unsigned char gCompileHour=COMPILE_HOUR;
const unsigned char gCompileMinute=COMPILE_MINUTE;
const unsigned char gCompileSecond=COMPILE_SECOND;
but the following code compiles without problems and one
can see in the assembly generated that the macros do
collapse to a single constant.
#define COMPILE_HOUR (((__TIME__[0]-'0')*10) +
(__TIME__[1]-'0'))
#define COMPILE_MINUTE (((__TIME__[3]-'0')*10) +
(__TIME__[4]-'0'))
#define COMPILE_SECOND (((__TIME__[6]-'0')*10) +
(__TIME__[7]-'0'))
unsigned char GetCompileHour(void)
{
unsigned char hour=COMPILE_HOUR;
return(hour);
}
unsigned char GetCompileMinute(void)
{
unsigned char minute=COMPILE_MINUTE;
return(minute);
}
unsigned char GetCompileSecond(void)
{
unsigned char second=COMPILE_SECOND;
return(second);
}
Generated assembly using WinAVR 2008-06-10:
.file "test.c"
__SREG__ = 0x3f
__SP_H__ = 0x3e
__SP_L__ = 0x3d
__CCP__ = 0x34
__tmp_reg__ = 0
__zero_reg__ = 1
.global __do_copy_data
.global __do_clear_bss
.text
.global GetCompileHour
.type GetCompileHour, @function
GetCompileHour:
/* prologue: function */
/* frame size = 0 */
ldi r24,lo8(8)
/* epilogue start */
ret
.size GetCompileHour, .-GetCompileHour
.global GetCompileMinute
.type GetCompileMinute, @function
GetCompileMinute:
/* prologue: function */
/* frame size = 0 */
ldi r24,lo8(40)
/* epilogue start */
ret
.size GetCompileMinute, .-GetCompileMinute
.global GetCompileSecond
.type GetCompileSecond, @function
GetCompileSecond:
/* prologue: function */
/* frame size = 0 */
ldi r24,lo8(43)
/* epilogue start */
ret
.size GetCompileSecond, .-GetCompileSecond
So is the code that gives an error actually incorrect C, or
is it a compiler bug ?
Regards
Anton Erasmus
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