[Bug c++/86748] New: Terminates abnormally without error messages

[stinkingmadgod at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86748

            Bug ID: 86748
           Summary: Terminates abnormally without error messages
           Product: gcc
           Version: 7.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stinkingmadgod at gmail dot com
  Target Milestone: ---

template <int N>
struct flag
{
    friend constexpr int adl_flag(flag<N>);
};

template <int N>
struct write
{
    friend constexpr int adl_flag(flag<N>) { return N; }
};

template <int N, bool = noexcept(adl_flag(flag<N>{}))>
static constexpr int read(int, flag<N>, int R = read(0, flag<N + 1>{}))
{
    return R;
}

int main()
{
    read(0, flag<0>{});
}

gcc version 7.1.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project) on
Windows 10

Compiled with

g++ main.cpp -std=c++17 -Wno-non-template-friend

Terminates after ~5x the usual compilation time and before completing (no
output) with no error messages. Memory usage goes to ~100MB during which.

I'm not certain if this is a bug, but given template instantiation depth
exceeded normally generates an error, clang segfaults and MSVC gives up, I
thought it might be worth reporting.