[Bug c++/92073] New: references/pointers to thread_local are not constant expressions

[tyker at outlook dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92073

            Bug ID: 92073
           Summary: references/pointers to thread_local are not constant
                    expressions
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tyker at outlook dot com
  Target Milestone: ---

currently gcc accepts the folowing:
```
template<int &data>
struct A {};

static thread_local int b;

A<b> a;
```
this is not valid. 
http://eel.is/c++draft/expr.const#10.2
says if a constant expression is a pointer to an object it should be in static
storage.

also, compilers(icc, clang, msvc) reject this code https://godbolt.org/z/d47fb9