------- Comment #1 from pinskia at gcc dot gnu dot org  2008-03-26 17:38 -------
This is a front-end issue.

C++ calls it at:
3952              /* Do not warn if the comparison is an equality operation,
3953                 the unsigned quantity is an integral constant and it does
3954                 not use the most significant bit of result_type.  */
3955              else if ((resultcode == EQ_EXPR || resultcode == NE_EXPR)
3956                       && ((op0_signed && TREE_CODE (orig_op1) ==
INTEGER_CST
3957                            && int_fits_type_p (orig_op1,
c_common_signed_type
3958                                                (result_type)))


While C does:
8499                      /* Do not warn if the comparison is an equality
operation,
8500                         the unsigned quantity is an integral constant, and
it
8501                         would fit in the result if the result were signed.
 */
8502                      else if (TREE_CODE (uop) == INTEGER_CST
8503                               && (resultcode == EQ_EXPR || resultcode ==
NE_EXPR)
8504                               && int_fits_type_p
8505                               (uop, c_common_signed_type (result_type)))


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |c


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35430

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