[sdcc-devel] [ sdcc-Bugs-3495989 ] Incorrect handling of arithemetic operations on void pointer

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Bugs item #3495989, was opened at 2012-03-01 06:37
Message generated for change (Comment added) made by spth
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Category: C-Front End
Group: None
>Status: Open
>Resolution: None
Priority: 5
Private: No
Submitted By: Phil ()
>Assigned to: Nobody/Anonymous (nobody)
Summary: Incorrect handling of arithemetic operations on void pointer

Initial Comment:
The following code compiles withou any warnings using SDCC : mcs51 3.1.0 #7066 (Nov 28 2011) (Mac OS X x86_64):

static void *ptr;
static unsigned char n;

void main(void)
{
	ptr += n;
}

However, the generated code does nothing:

;	testcase2.c:7: ptr += n;
	ret


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>Comment By: Philipp Klaus Krause (spth)
Date: 2012-03-01 07:12

Message:
It seems I was partially wrong. While sdcc's current behaviour is correct
for C89/90, C95 and C99, it is not for C11. We should make it an error for
C11, which does not allow pointers to incomplete object types as addition
operands.

Philipp


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Comment By: Philipp Klaus Krause (spth)
Date: 2012-03-01 07:01

Message:
Maybe we should warn here, since you seem to be at least the second person
running into this and not liking what sdcc does. Nevetheless, AFAIK, this
is standard-compliant bahaviour.

Philipp


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