`M0-1-3`: Consider uses of global, namespace and member `constexpr`s as variable arguments

[lcartey]

Affected rules

• M0-1-3

Description

Similar to, but for global/namespace/member variables:
5ecee7e

Example

#include <cstdio>
template <int t>
class CharBuffer
{
  public:
  int member[t];
  CharBuffer():member{0}{}
};

constexpr int line_length = 1024U;

int foo()
{
  CharBuffer<line_length> buffer{};
  constexpr std::size_t max_stack_size_usage = 64 * 1024;
  static_assert(
      (sizeof(buffer) + sizeof(line_length)) <= max_stack_size_usage,
        "assert");
  return buffer.member[0];
}