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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99845] gcc8: Overloaded operator new[](size_t, const
 std::nothrow_t&) is seg faulting when the allocation fails
Date: Wed, 31 Mar 2021 11:40:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99845

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

namespace std {
  using size_t =3D decltype(sizeof(0));

  struct nothrow_t { } const nothrow =3D { };
}

void* operator new(std::size_t);
void* operator new[](std::size_t);
void operator delete(void*) noexcept;
void operator delete[](void*) noexcept;
void operator delete(void*, std::size_t) noexcept;
void operator delete[](void*, std::size_t) noexcept;

void* operator new(std::size_t, const std::nothrow_t&) noexcept;
void* operator new[](std::size_t, const std::nothrow_t&) noexcept;
void operator delete(void*, const std::nothrow_t&) noexcept;
void operator delete[](void*, const std::nothrow_t&) noexcept;

extern "C" int printf(const char* ...);

using std::size_t;

struct X
{
  void* operator new[](size_t sz, const std::nothrow_t& nt) {
    return ::operator new(sz, nt);
  }

  unsigned data =3D 0;
};

struct Y
{
  static X* alloc(unsigned n) { return new(std::nothrow) X[n]; }
};

int main()
{
  Y::alloc(-1u);
}=