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From: "dblaikie at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107741] New: Missed member variable name in mangling of
 externally visible lambdas used in inline initialization of static members
Date: Fri, 18 Nov 2022 01:05:17 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107741

            Bug ID: 107741
           Summary: Missed member variable name in mangling of externally
                    visible lambdas used in inline initialization of
                    static members
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dblaikie at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/7514cTh5o
```
struct A {
    static constexpr auto x =3D [] {
        return 1;
    };
};
template <typename>
struct B {
    static constexpr auto x =3D [] {
        return 1;
    };
};
template <typename T>
struct C {
    static int x;
};
void side_effect();
template <typename T>
int C<T>::x =3D (side_effect(), [] { return 1; }());
template int C<int>::x;
void f() {
    A::x();
    B<int>::x();
}
```
GCC produces these manglings:
```
A::{lambda()#1}::operator()() const
_ZNK1AUlvE_clEv

B<int>::{lambda()#3}::operator()() const
_ZNK1BIiEUlvE1_clEv

C<int>::x::{lambda()#1}::operator()() const
_ZNK1CIiE1xMUlvE_clEv
```

I believe in the first two cases, the member variable scope ("::x") is miss=
ing.

Oh, and it looks like the lambda numbering is off - B's lambda is 1 within =
its
scope (either the type or the member) - so I guess that needs to be fixed
too/scoping the numbering to within the member along with the mangling havi=
ng
that scoping.=