Re: [avr-gcc-list] BYTE4 and BYTE3 of an int32_t get cleared after va_arg(vl, int32_t)?!

[Philipp Burch]

Hi again,

I think the problem has just solved itself. I've redeclared val in 
another part of the switch statement as a uint16_t... I really should 
avoid such confusing code :(

Sorry for this unnecessary post,
Philipp
> Hello all,
>
> I've experienced some trouble compiling a program with avr-gcc. I've 
> made a replacement for the standard printf()-function to suit my 
> needs. So far, no problems. But inside this function there's quite a 
> big switch statement selecting the format specifier. Outside this 
> statement, there is an int32_t defined to hold the value of any given 
> numeric arguments. Depending on the format string, it is either pop'd 
> using
> val = va_arg(vl, int16_t) or
> val = va_arg(vl, int32_t).
> I've used the debugger to check if the right one is called, that's ok. 
> But this conditional statement is used twice inside the switch (once 
> for integral values and once for fixed-point-values). The first time 
> all is translated fine, all four bytes are fetched correctly. But the 
> second time, only the two lower bytes are fetched and the upper bytes 
> are just nulled, whether va_arg() reads an int16_t or an int32_t.
> The whole code and some disassembler listings can be found here: 
> http://www.mikrocontroller.net/topic/87044#736984
>
> I don't know if this is a bug in the compiler or just a mistake in my 
> code.
>
> I hope, someone can help me.
>
> Thanks in Advance,
> Philipp
>
>
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