[Bug c++/18049] New: wrong result without -O2 with g++-3.4.2 and completely wrong result with any other g++ version

[dkouroun at mailbox dot gr]

Only g++-3.4.2 performs well and gives correct results if and only if it is
compiled with -O2. 
Basically dx function takes an argument of type
***AssemblyTerm<0, Simplex, _2D, P2>,***
and returns 
***AssemblyTerm<1, Simplex, _2D, P2>.*** 
Then in the main I declare

AssemblyTerm<0, Simplex, _2D, P2> v(mesh, &Vec);
and
AssemblyTerm<1, Simplex, _2D, P2> vdx(mesh, &Vec);
just to compare the output of dx(v)(i,x,y,z) with
vdx(i,x,y,z) which should both give the same result.

Unfortunately although the output is the same (only with g++ --all versions--
-O2) before the declaration of

typedef typeof(dx(u)*dx(v)) dxType;
dxType A=dx(u)*dx(v);

after that declaration the output changes; I do not
know for what reason. g++-3.4.2 has no problem if with(-O2) but the other
compilers fail to give correct result when we do not comment out 
the typedef declaration.

-- 
           Summary: wrong result without -O2 with g++-3.4.2 and completely
                    wrong result with any other g++ version
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P1
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dkouroun at mailbox dot gr
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: GCC-4.0-20041017
  GCC host triplet: GCC-3.3.1 SuSE Linux 9.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18049