flag -m64 causes syntax error

[Ulrich Lauther]

the following code:
#include <stdio.h>
#include <stdarg.h>

inline void fsend(const char* fmt, ... ) {
  char buf[256];
  va_list ap;
  va_start(ap,fmt);
  vsprintf(buf,fmt,(va_list) ap); // line 76
  va_end(ap); 
  send(buf);
}

compiles fine with g++ -m32 but g++ -m64 gives:

/home/lauther/turbo/incl/TURBO/gedit_link.h:76: error: ISO C++ forbids
casting to an array type __va_list_tag [1]

The compiler is:

Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../src/gcc-4.0.2/configure --prefix=/sw/gcc4.0.2 
--with-local-prefix=/sw/local
Thread model: posix
gcc version 4.0.2


Any ideas?

-- 
        -lauther

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Ulrich Lauther          ph: +49 89 636 48834 fx: ... 636 42284
Siemens CT SE 6         Internet: Ulrich.Lauther@siemens.com