For the attached (unfortunately rather lengthy) file I finally managed
to get a reproducible testcase that spews out several pages of
canonical types warning messages when compiled with -O2 (but not with
-O0):
examples/step-27> /tmp/bangerth/bin/gcc-mainline/bin/g++ -c step-27.ii -O2
step-27.cc: In member function 'void LaplaceProblem<dim>::create_coarse_grid()
[with int dim = 2]':
step-27.cc:742: warning: same canonical type node for different types
dealii::Point<2> [24] and const dealii::Point<2> [24]
<array_type 0xb4cef8dc
type <record_type 0xb7459bd0 Point sizes-gimplified addressable
needs-constructing type_1 type_5 type_6 BLK
size <integer_cst 0xb7d5e834 constant invariant 128>
unit size <integer_cst 0xb7d5e850 constant invariant 16>
align 32 symtab 0 alias set 147 canonical type 0xb7459bd0
fields <field_decl 0xb5f54a20 D.74077 type <record_type 0xb745472c
Tensor>
ignored decl_6 BLK file
/tmp/bangerth/x/deal.II/base/include/base/tensor_base.h line 39 size
<integer_cst 0xb7d5e834 128> unit size <integer_cst 0xb7d5e850 16>
align 32 offset_align 128
offset <integer_cst 0xb7d5e444 constant invariant 0>
bit offset <integer_cst 0xb7d5eb28 constant invariant 0> context
<record_type 0xb7459bd0 Point> chain <type_decl 0xb5f8a438 Point>> context
<namespace_decl 0xb7e25870 dealii>
needs-constructor X() X(constX&) this=(X&) n_parents=1 use_template=1
interface-unknown
pointer_to_this <pointer_type 0xb5f8a510> reference_to_this
<reference_type 0xb5f8e0d8> chain <type_decl 0xb7459c3c Point>>
sizes-gimplified needs-constructing BLK
...
I hope this helps to track a few things down. I have a couple of other
files that show canonical types fail as well, but there the bug goes
away once one uses -save-temps :-(
Best
Wolfgang
--
Summary: Canonical types failures
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bangerth at dealii dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31505
