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
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