[Bug c++/30602] New: [4.3 regression] Error with canonical types

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

I get a warning about canonical types like this from one of my codes:

tests/bits> /tmp/bangerth/bin/bin/g++ -DHAVE_CONFIG_H -DHAVE_ISNAN -ggdb
-DDEBUG -pedantic -Wall -Wpointer-arith -Wwrite-s
trings -Winline -Woverloaded-virtual -Wsynth -Wsign-compare -Wconversion
-Wswitch -ftemplate-depth-128 -Wno-long-long -fPI
C  -I/tmp/bangerth/d/deal.II/base/include -I/tmp/bangerth/d/deal.II/lac/include
-I/tmp/bangerth/d/deal.II/deal.II/include 
-I/tmp/bangerth/d/deal.II/contrib/boost/include
-I/tmp/bangerth/d/deal.II/contrib -Wno-conversion -c step-13.cc -o step-13
/obj.g.o
In file included from
/tmp/bangerth/d/deal.II/contrib/boost/include/boost/type_traits.hpp:61,
                 from
/tmp/bangerth/d/deal.II/base/include/base/thread_management.h:25,
                 from step-13.cc:29:
/tmp/bangerth/d/deal.II/contrib/boost/include/boost/type_traits/extent.hpp:96:
warning: canonical types differ for identic
al types T [] and T []
 <array_type 0xb5f8e410
    type <template_type_parm 0xb5f8e340 T type_0 type_6 VOID
        align 8 symtab 0 alias set -1 canonical type 0xb68c4d00
       index 0 level 1 orig_level 1
        chain <type_decl 0xb5f8e3a8 T>>
    type_0 type_6 VOID
    align 8 symtab 0 alias set -1 canonical type 0xb5f8e478>
 <array_type 0xb5e44f08
    type <template_type_parm 0xb5e44e38 T type_0 type_6 VOID
        align 8 symtab 0 alias set -1 canonical type 0xb68c4d00
       index 0 level 1 orig_level 1
        chain <type_decl 0xb5e44ea0 T>>
    type_0 type_6 VOID
    align 8 symtab 0 alias set -1 canonical type 0xb5e44f70>
/tmp/bangerth/d/deal.II/contrib/boost/include/boost/type_traits/extent.hpp:96:
warning: canonical types differ for identic
al types T [] and T []
 <array_type 0xb5f8e410
    type <template_type_parm 0xb5f8e340 T type_0 type_6 VOID
        align 8 symtab 0 alias set -1 canonical type 0xb68c4d00
       index 0 level 1 orig_level 1
        chain <type_decl 0xb5f8e3a8 T>>
    type_0 type_6 VOID
    align 8 symtab 0 alias set -1 canonical type 0xb5f8e478>
 <array_type 0xb5e44f08
    type <template_type_parm 0xb5e44e38 T type_0 type_6 VOID
        align 8 symtab 0 alias set -1 canonical type 0xb68c4d00
       index 0 level 1 orig_level 1
        chain <type_decl 0xb5e44ea0 T>>
    type_0 type_6 VOID
    align 8 symtab 0 alias set -1 canonical type 0xb5e44f70>


The problem is: whenever I use -save-temps, or run everything by hand 
through -E and then use the same compiler with the same flags on the
result, the bug goes away. So for the moment, I'm a bit unsure how exactly
I can submit the code :-(

Doug, is there anything that you can glean from the output above that
would help in any way?


-- 
           Summary: [4.3 regression] Error with canonical types
           Product: gcc
           Version: 4.3.0
            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=30602