[Bug c/18057] New: strange warning

["etienne_lorrain at yahoo dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

With the latest version bootstrapped on PC debian:
$ /home/etienne/projet/toolchain/bin/gcc -v
Reading specs from /home/etienne/projet/toolchain/lib/gcc/i686-pc-linux-
gnu/4.0.0/specs
Configured with: ../configure --prefix=/home/etienne/projet/toolchain --enable-
languages=c
Thread model: posix
gcc version 4.0.0 20041017 (experimental)

   compiling this code:
typedef struct {
    unsigned    limit : 16;
    unsigned    base : 24;
    unsigned    accessed : 1;                   /* if 1 */
    unsigned    writable : 1;                   /* if 1 */
    unsigned    expansion_direction : 1;        /* down if 1 */
    unsigned    cste_10 : 2;
    unsigned    dpl : 2;
    unsigned    present : 1;
    unsigned    limit_msb : 4;
    unsigned    available : 1;
    unsigned    cste_0 : 1;
    unsigned    big : 1;
    unsigned    granularity : 1;
    unsigned    base_msb : 8;
    } __attribute__ ((packed)) dataseg_t;

dataseg_t dataseg = {
          .limit        = 0xFFFF,
          .base         = 0,
          .accessed     = 1,
          .writable     = 1,
          .cste_10      = 2,
          .present      = 1,
          .limit_msb    = 0xFF,
          .big          = 0,
          .granularity  = 1
    };

  leads to this warning (line of .limit_msb):
$ /home/etienne/projet/toolchain/bin/gcc -Os -c tmp.c
tmp.c:25: warning: large integer implicitly truncated to unsigned type

  Etienne.

-- 
           Summary: strange warning
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: etienne_lorrain at yahoo dot fr
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18057