[Bug c++/48132] New: Internal compiler error on array of std::complex with -std=cxx0x

[Bug c++/48132] New: Internal compiler error on array of std::complex with -std=cxx0x

[martin.kronbichler at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

           Summary: Internal compiler error on array of std::complex with
                    -std=cxx0x
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: martin.kronbichler@it.uu.se


gcc 4.6.0 weekly snapshot 20110312

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../configure --enable-languages=c,c++,fortran,objc,obj-c++,go
--prefix=/usr --libexecdir=/usr/lib --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --without-included-gettext
--enable-threads=posix --program-suffix=-4.6 --enable-nls --enable-clocale=gnu
--enable-libstdcxx-debug --enable-plugin --enable-objc-gc --disable-werror
--with-arch-32=i486 --with-tune=core2 --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-cpu=core2
Thread model: posix
gcc version 4.6.0 20110312 (experimental) (GCC)

With the following code:

#include <complex>
void test () {
  std::complex<double> array[] = { std::complex<double>(0,1) };
}

I get:
$ g++ -std=c++0x  -c complex_test.cc -o complex_test.o
complex_test.cc: In function ‘void test()’:
complex_test.cc:4:62: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.

The code compiles fine without -std=c++0x, and it is also fine with gcc 4.5.2.

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.03.15 08:59:36
            Summary|Internal compiler error on  |[4.6/4.7 Regression]
                   |array of std::complex with  |[C++0x] Internal compiler
                   |-std=c++0x                  |error on array of
                   |                            |std::complex with
                   |                            |-std=c++0x
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-03-15 08:59:36 UTC ---
confirmed

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.0

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-03-15 12:15:13 UTC ---
Reduced testcase:

struct C
{
  constexpr C (int x) : c (x) {}
  int c;
};

void
foo ()
{
  C a[] = { C (0) };
}

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-03-15 13:19:09 UTC ---
Regressed (expectedly) with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=166167
The problem seems to be that the middle-end relies on indexes being filled in
in ctors for arrays, but the C++ FE in this case doesn't fill them in.
For POD arrays the indexes are added by process_init_constructor_array, but
that
isn't called in this case (both because check_initializer will do:
              /* Don't call digest_init; it's unnecessary and will complain
                 about aggregate initialization of non-aggregate classes.  */
              flags |= LOOKUP_ALREADY_DIGESTED;
and also because it is called only for:
  if (BRACE_ENCLOSED_INITIALIZER_P (init)
      && !TYPE_NON_AGGREGATE_CLASS (type))
    return process_init_constructor (type, init);

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-16 20:04:13 UTC ---
Author: jason
Date: Wed Mar 16 20:04:06 2011
New Revision: 171068

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171068
Log:
    PR c++/48132
    * decl.c (check_array_designated_initializer): Allow integer index.
    (reshape_init_array_1): Set index on the elements.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-array3.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-16 20:03:17 UTC ---
Author: jason
Date: Wed Mar 16 20:03:12 2011
New Revision: 171065

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171065
Log:
    PR c++/48132
    * decl.c (check_array_designated_initializer): Allow integer index.
    (reshape_init_array_1): Set index on the elements.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/constexpr-array3.C
Modified:
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/decl.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog

[Bug c++/48132] [4.6/4.7 Regression] [C++0x] Internal compiler error on array of std::complex with -std=c++0x

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48132

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jason at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> 2011-03-16 20:22:16 UTC ---
Fixed.