gcc produces unassemblable assembly code. 

//testcase:
struct S
{
  signed int a:17;
} x;

typedef typeof (x.a) foo;

template <class T>
T* inc(T* p) { return p+1; }

int main ()
{
  foo x[2] = { 1,2 };
  int y[2] = { 1,2 };
  *inc(x);
  *inc(y);
  return 0;
}

result
$ g++ -S bug.cpp
$ g++ -c bug.s
bug.s: Assembler messages:
bug.s:18: Error: symbol `__Z3incIiEPT_S1_' is already defined

gcc version: 4.2 20061212


-- 
           Summary: bit-field: unassemblable assembly code
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: s__nakayama at infoseek dot jp


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30328

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