Hello.
va_arg seems to take the value from unexpected location on x86_64, in a case
where a variable argument function returns a struct that is larger than 16
bytes. I tested on plain x86 (32 bit) via JSLinux
(https://bellard.org/jslinux/vm.html?url=alpine-x86-xwin.cfg&mem=256&graphic=1)
and the issue does not seem to occur there. Can anyone reproduce? Code listed
below, which erroneously prints '3' instead of '17':
#include <stdarg.h>
#include <stdio.h>
struct s {
char a[17];
} s;
struct s f( int a, ... )
{
va_list args;
va_start( args, a );
printf( "%d\n", va_arg( args, int ) );
va_end(args);
return (struct s){0};
}
int main()
{
f( 3, 17 );
return 0;
}
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