Re: Too many warnings building Emacs with GCC 6 on MSYS2-MinGW64

[Ken Brown]

On 9/1/2016 12:17 PM, Davis Herring wrote:
> > On Unix, execve indeed returns an int, because it's a process ID.  On
> > Windows, the return value can be a process handle, which is a 64-bit
> > data type on 64-bit Windows.  That is why the return value must be
> > intptr_t, not an int.
>
> No, it's an error code.  (You said as much for POSIX in your following
> message, but it's an error code on all systems.)  If it succeeds, the
> process image has been replaced and it doesn't return at all.

The return value is not an error code.  If the function returns, it 
returns -1 and sets errno:

  http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
  https://msdn.microsoft.com/en-us/library/hyw61wtd.aspx

Ken