[Bug server/15081] New: AX with gcc-4.8: Expression pieces exceed word size

["jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15081

             Bug #: 15081
           Summary: AX with gcc-4.8: Expression pieces exceed word size
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
    Classification: Unclassified
              Host: x86_64-unknown-linux-gnu
            Target: x86_64-unknown-linux-gnu


Then there is in gdbserver mode:
 -PASS: gdb.trace/collection.exp: collect register locals collectively: start
trace experiment
 +FAIL: gdb.trace/collection.exp: collect register locals collectively: start
trace experiment
due to:
  register int         locar[4];
  locar[0] = 121;
  locar[1] = 122;
  locar[2] = 123;
  locar[3] = 124;
producing with gcc-4.8.0pre:
 DW_AT_location:
(DW_OP_reg12(r12);DW_OP_piece:8;DW_OP_reg13(r13);DW_OP_piece:8)
which cannot be handled by current AX:
            if (bits_collected + size > 8 * sizeof (LONGEST))
              error (_("Expression pieces exceed word size"));
as it is 128-bit variable (from two 64-bit registers).

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