Problem with Attribute(Used)

[ndudman]

Hi

With the code below... I can't get to compile because of the way the if () block is created in c file... I think I saw this refered to when I first was looking through posts but can't find it again. The generated c code is shown below also.

Code: Select all

public menuActive		as byte 

public sub showDataLCD() Attribute(Used)
	do
		Dim a as Integer Attribute(used)
		Dim b as Integer Attribute(used)
		a = CInt(menuActive )
		b = 2

		if &#40; a < b &#41; then
			delay&#40;2.1&#41;
		end if
		delay&#40;1.0&#41;
	loop
end sub

sub main&#40;&#41;
	menuActive = 1
end sub

• est10.c:50: warning: 'used' attribute ignored
  test10.c:51: warning: 'used' attribute ignored
  test10.c:57: error: expected expression before ')' token
  test10.bas:10: Internal Error: no means to generate code for expression

Code: Select all

void
zf_showDataLCD(void)
{
	{
		int16_t zv_a USED;
		int16_t zv_b USED;

		while (1)
		{
			zv_a = TYPECAST(int16_t, (uint8_t)zv_menuActive);
			zv_b = 2;
			if ()
			{
				taskDelay(2.1);
			}
			taskDelay(1.0);
		}
	}
}

p.s Is it really required if a sub is marked with attribute(used) to have to also mark variables (in this example a, b) also as used ?

Thanks
Neil

[dkinzer]

I can't get to compile because of the way the if () block is created in c file.

The problem has been verified and a solution has been identified. We still have some testing to do.

Is it really required if a sub is marked with attribute(used) to have to also mark variables (in this example a, b) also as used ?

No. Procedures that are marked with the Used attribute but not referenced in ZBasic code are currently not being processed correctly. What you're seeing is an artifact of that problem.

[ndudman]

Thanks for the confirmation

Regards
Neil

[dkinzer]

The problem has been verified and a solution has been identified.

There is an experimental version of the compiler that corrects this problem (available via the link below). It is not yet fully tested but the preliminary testing results look good. The experimental version also contains the correction for the structure member reference issue (also not fully tested).

http://www.zbasic.net/download/ZBasic/2 ... 2-6-12.zip