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
