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From: "brunopitrus at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114267] New: bogus -Wsubobject-linkage when using lambda
 members as template parameters
Date: Thu, 07 Mar 2024 13:22:58 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114267

            Bug ID: 114267
           Summary: bogus -Wsubobject-linkage when using lambda members as
                    template parameters
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: brunopitrus at hotmail dot com
  Target Milestone: ---

header.h:
```
struct F{
        constexpr static const auto algorithm=3D[]() {};
};

constexpr inline const auto algorithm=3D[]() {};


template<auto algo> struct G{};

struct S{
        G<algorithm> foo; //ok
        G<F::algorithm> lol; //Wsubobject-linkage
};
```

main.cpp:
//can be empty

See it on godbolt:
https://godbolt.org/z/qccjfTPnr

The behavior is inconsistent between the lambda declared as a member and as=
 a
non-member. Moreover, if i compile this code with -O0, the resultant object=
 has
a =E2=80=98r=E2=80=99 private symbol for F::algorithm, which makes me suspe=
ct that wrong code
is being generated.=