[Bug c/56712] New: constuctor function is called twice

[bernd.edlinger at hotmail dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56712

             Bug #: 56712
           Summary: constuctor function is called twice
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bernd.edlinger@hotmail.de


Created attachment 29713
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29713
cnt++ is accidentally called twice at -O2 or higher

The attached test program has a constructor function
with the __attribute__((constructor)) that is split
up into two parts construct.part.0 and construct
construct.part.0 is the part after "if (xx != 0) return;"

The problem is that both are put into the .ctors section
first the construct.part.0 and then construct.
Unfortunately the construct function is called before
construct.part.0 which has the check removed.

Therefore basically the constuctor is called twice:
cnt=2 at -O2 or -O3, but cnt=1 at -O1 or less.