[Bug c++/31506] New: Canonical types failures

["bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>]

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=31506