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From: "daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/55226] New: [C++11] ICE regression in regard to anonymous unions and constexpr
Date: Wed, 07 Nov 2012 07:45:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55226

             Bug #: 55226
           Summary: [C++11] ICE regression in regard to anonymous unions
                    and constexpr
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: daniel.kruegler@googlemail.com


The following code gives me now a regressive ICE when switching from my
previous gcc 4.8 (last successfully tested: 4.8.0 20121014 (experimental)) to
gcc 4.8.0 20121104 (experimental) using the compiler flags

-Wall -pedantic -std=c++11

//----------------------
template<class T>
struct optional_data
{
  union {
    unsigned char for_value_init_;
    T value_;
  };

  constexpr optional_data() : for_value_init_() {}
};

struct ncnm
{
  ncnm(ncnm&&) = delete;
  ncnm(const ncnm&) = delete;
};

int main()
{
  optional_data<ncnm> o; // #20
}
//----------------------

"In function 'int main()':|
20|internal compiler error: in gimplify_init_ctor_eval, at gimplify.c:3787|
"

A tentative guess is that this could have been a side-effect of the fix applied
to bug 54922.