[Bug c++/21892] New: value of constexpr variable is "<optimized out>" (no optimization)

["keiths at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21892

            Bug ID: 21892
           Summary: value of constexpr variable is "<optimized out>" (no
                    optimization)
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: keiths at redhat dot com
  Target Milestone: ---

Reported originally in c++/20020

----- snip -----

$ cat main.cpp 
struct A {
    static constexpr const char *a = "a";
    void foo() { }
};

int main(void) {
    A a;
    a.foo();
}

Compile with g++ 7.1 with C++17 semantics: g++-7 -std=c++17 -g -o main main.cpp

Now run it with gdb:

$ gdb main
GNU gdb (Debian 7.11.1-2~bpo8+1) 7.11.1
(...)
(gdb) b A::foo
Breakpoint 1 at 0x40055e: file main.cpp, line 6.
(gdb) r
Starting program: main 

Breakpoint 1, A::foo (this=0x7fffffffe09f) at main.cpp:6
6           void foo() { }
(gdb) print *this
$1 = {static a = <optimized out>}

----- end -----

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