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From: "carlosgalvezp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109669] New: Internal Compiler Error when zero-initializing
 std::array
Date: Fri, 28 Apr 2023 14:08:37 +0000
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X-Bugzilla-Version: 13.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109669

            Bug ID: 109669
           Summary: Internal Compiler Error when zero-initializing
                    std::array
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: carlosgalvezp at gmail dot com
  Target Milestone: ---

Hi,

We are getting an ICE when bumping from
6910cad55ffc330dc9767d2c8e0b66ccfa4134af to
cc035c5d8672f87dc8c2756d9f8367903aa72d93 (GCC 13.1.0 release) on the follow=
ing
reduced example:

#include <array>

template <typename T, std::size_t n>
struct Point
{
 private:
    T value_[n]{};
};

struct Edge
{
    Point<float, 3> start{};
    Point<float, 3> end{};
};

template <typename T, std::size_t n>
class StaticVector
{
 public:
    static StaticVector create()
    {
        StaticVector output;
        return output;
    }

 private:
    std::array<T, n> data{};
};

class Polygon
{
 public:
    using Edges =3D StaticVector<Edge, 3>;
    Edges edges() const
    {
        auto edges =3D Edges::create();
        return edges;
    }
};

void foo()
{
    Polygon polygon{};
    auto const edges =3D polygon.edges();
}

Godbolt: https://godbolt.org/z/183zv1xrK

Error:
<source>: In instantiation of 'constexpr StaticVector<Edge,
3>::StaticVector()':
<source>:22:22:   required from 'static StaticVector<T, n> StaticVector<T,
n>::create() [with T =3D Edge; long unsigned int n =3D 3]'
<source>:36:35:   required from here
<source>:27:22: internal compiler error: Segmentation fault
   27 |     std::array<T, n> data{};
      |                      ^~~~
0x234da0e internal_error(char const*, ...)
        ???:0
0xccea48 finish_for_cond(tree_node*, tree_node*, bool, unsigned short)
        ???:0
0xb7bad3 build_vec_init(tree_node*, tree_node*, tree_node*, bool, int, int,
vec<tree_node*, va_gc, vl_embed>**)
        ???:0
0xce5cfb expand_vec_init_expr(tree_node*, tree_node*, int, vec<tree_node*,
va_gc, vl_embed>**)
        ???:0
0xd200c1 digest_nsdmi_init(tree_node*, tree_node*, int)
        ???:0
0xb813b7 maybe_instantiate_nsdmi_init(tree_node*, int)
        ???:0
0xb819f9 get_nsdmi(tree_node*, bool, int)
        ???:0
0xba932d get_defaulted_eh_spec(tree_node*, int)
        ???:0
0xc76d4a maybe_instantiate_noexcept(tree_node*, int)
        ???:0
0xc76b5a maybe_instantiate_noexcept(tree_node*, int)
        ???:0
0xb5c2b3 mark_used(tree_node*, int)
        ???:0
0xa9931e build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_g=
c,
vl_embed>**, tree_node*, int, tree_node**, int)
        ???:0
0xa9a4c7 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
        ???:0
0xb7d468 build_aggr_init(tree_node*, tree_node*, int, int)
        ???:0
0xb4c768 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ???:0
0xc80395 instantiate_decl(tree_node*, bool, bool)
        ???:0
0xcab7fb instantiate_pending_templates(int)
        ???:0
0xb5f735 c_parse_final_cleanups()
        ???:0
0xd8f918 c_common_parse_file()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1

I tried to reduce it with creduce but creduce itself crashed :/=