large integer implicitly truncated to unsigned type

[Keith Owens]

CVS gcc October 22, 2000 gives lots of

  warning: large integer implicitly truncated to unsigned type

messages for constructs like this.

  #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )

Changing to

  #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & (unsigned)~(sizeof(long)-1) )

removes the warning.  Is this warning message correct and is it going
to be a permanent feature of gcc?  If so I will do a kernel patch to
make (unsigned) explicit.