[Bug optimization/12187] New: Miscompilation of nested functions using host variables

[pbrook at gcc dot gnu dot org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12187

           Summary: Miscompilation of nested functions using host variables
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: critical
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pbrook at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org

Functions containing nested functions which write to variables in their parent 
are miscompiled. This might be rare in C, but is quite common in Fortran. 
 
Simple Testcase 
 
int main() 
{ 
  int a; 
  void test(int i) 
    { 
      a = i; 
    }; 
  a = 0; 
  test (42); 
  if (a != 42) 
    abort (); 
  exit (0); 
}