https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122253
Nathaniel Shead <nshead at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libstdc++ |c++
CC| |nshead at gcc dot gnu.org
Status|UNCONFIRMED |NEW
Last reconfirmed| |2025-10-15
Ever confirmed|0 |1
--- Comment #3 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
I've taken a quick look and there's definitely something off. Here's a reduced
example:
export module M;
template <int> struct ic {};
template <typename T> void go(T x) {
[&] { ic<x>{}; };
}
$ g++ -fmodules -S test.cpp
/home/wreien/m/f.cpp:4:3: error: ‘template<class T> go(T)::<lambda()>’ exposes
TU-local entity ‘struct ic<x>’
4 | [&] { ic<x>{}; };
| ^
/home/wreien/m/f.cpp:2:23: note: ‘struct ic<x>’ declared with internal linkage
2 | template <int> struct ic {};
| ^~
By-value capture or explicit capture also causes the issue, but it happens
specifically when naming a capture proxy through a template creating a
pseudo-instantiation with internal linkage that then gets complained about.
