Re: gcc varargs problem

[whoosh <whoosh777 blueyonder co uk>]

On 01-Aug-08 03:00:09 Tom Horsley wrote:
>On Fri, 01 Aug 2008 02:36:54 +0100
>whoosh <whoosh777 blueyonder co uk> wrote:

>> 64 bit Fedora 9's gcc regards this as an error, all the other gcc's eg 
>> on 32 bit Fedora Core 3 have no problem with this.

>The standard regards it as an error as well, and if you looked up
>the insane argument passing conventions for x86_64, you'd know why :-).
>If you want to write portable code, look at the stdarg man page and
>use the va_start, va_copy, etc. macros.


ok, from that man page it looks like the way to do it is:

f( va_list *pargs )
{
va_list args ;

va_copy( args, *pargs ) ; // instead of args = *pargs 
}

thats alright then.


is there a way to switch off the signedness errors, where 

I use "unsigned char *" for strings to prevent char 255 being

sign extended to EOF?








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