> On 17/01/2015 19:03, "Philipp Klaus Krause" <p...@spth.de> wrote:
>
>>Currently, when compiling using --std-sdcc89 or --std-sdcc99 (but not
>>when using --std-c89, --std-c99 or --std-c11), sdcc does not do integer
>>promotion on explicitly cast arguments to functions with variable
>>arguments:
>>
>>void f1(int, ...);
>>
>>char c;
>>
>>void f2(void)
>>{
>> f1(0, (char)c); // Will pass a char
>> f1(0, c); // Will pass an int
>>}
>>
>>This can save a byte on the stack when passing an argument of char to a
>>functionw with variable arguments. However, it makes code compiled using
>>different --std- options incompatible (will fail at run time). I assume
>>char arguments to functions with variable arguments to be relatively
>>rare, and the cases where the single byte on the stack matters even more
>>so.
>>
>>In anyone using this feature?
>>
>>If not, I'd suggest to drop it after the next release.
>>
>>Philipp
>>
>>
>
> I'm ok with dropping this.
Please state the targets you use.
I'm not interested in z80 users with 64k stack space who are ok with
dropping this. I would want to hear from 8051 users who need to work with
a really small stack (~128 bytes) or other targets with a similarly small
stack.
Personally I think it really helps the 8051 users. E.g. to printf %c
Maarten
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