[Bug sanitizer/58413] New: ubsan constant folding

[jan.sm...@alcatel-lucent.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58413

            Bug ID: 58413
           Summary: ubsan constant folding
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jan.sm...@alcatel-lucent.com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org

variable-sized object may not be initialized
  unsigned short x[128 >> 5] = {};

initializer element is not constant
  static int x = ((int)( 0x00000000 | ((31 & ((1 << (4)) - 1)) << (((15) + 6) +
4)) | ((0) << ((15) + 6)) | ((0) << (15)) ) );
(yes, auch)

unexpected size of type 'long long unsigned int:40'
  uint64_t start_of_buffer = ((res.ptr.s.addr >> 7) - res.ptr.s.back) << 7; 
   .addr and .back are bitfield members of struct s. ptr is a pointer to an
union.


case label does not reduce to an integer constant

switch(int)
...
   case (1<<1):
    ..


They all seem related.

Thanks!