I see in topic topc5112 that a problem with va_list was fixed in the 6.5.0 tool chain. I'm not sure if it was this "fix"
 or not but our existing code base will not compile using the 6.5.0 tools due to a va_list error. The error I'm seeing 
is "error: 'va_list' was not declared in this scope". I can fix the problem when building with the 6.5.0 tools by 
including a line containing "using std::va_list;" after including cstdarg. Unfortunately, we have multiple build 
products and some of them use legacy development tools (i.e. 6.3.0 and 6.3.2). With the mentioned "using" line, these 
older compilers yack. I don't like doing it but I tried putting a "#if (_NTO_VERSION >= 650)" around the "using" line 
but that doesn't work for the 6.5.0 tools. Is _NTO_VERSION not supported in the 6.5.0 tool chain? Here's a code snippet 
to recreate the problem.

#include <cstdarg>
#if __QNXNTO__
 #if (_NTO_VERSION >= 650) // remove to get 6.5.0 to work
   using std::va_list;
 #endif                    // remove to get 6.5.0 to work
#endif
#include <string.h>

void va_cat(char *s, ...)
{
    char *t;
    va_list ap;

    va_start(ap, s);
    while ((t = va_arg(ap, char *)))
    {
        s += strlen(s);
        strcpy(s, t);
    }
    va_end(ap);
}

The code above compiles using the 6.3.0 tools but not the 6.5.0 tools. Removing the "#if (_NTO_VERSION >= 650)" 
conditional compilation makes the code compile using the 6.5.0 tools but it then fails with the 6.3.0 tools. Any ideas 
how to make va_list work with the 6.3.0, 6.3.2 and 6.5.0 tools? Thanks.

Mark