https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122636
Bug ID: 122636
Summary: False positive warning 'expose TU-local entity'
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: d7d1cd at mail dot ru
Target Milestone: ---
Here's the module code:
export module M;
export template <typename>
struct Foo {
constexpr static inline auto lambda = []{};
template <typename T = decltype(lambda)>
static void foo(T = lambda) {}
};
And here's the code that imports this module:
import M;
namespace {
struct Bar {};
void bar() { Foo<Bar>::foo(); }
}
int main() { bar(); }
When compiling, I get a warning:
main.cc:7:17:
7 | Foo<Bar>::foo();
module.ixx:8:18: warning: instantiation exposes TU-local entity
'Foo@M<{anonymous}::Bar>::lambda' [-Wexpose-global-module-tu-local]
8 | static void foo(T = lambda) {}
module.ixx:5:34: note: declared here
5 | constexpr static inline auto lambda = []{};
This appears to be a regression, as it only appears in version 16. There is no
warning in versions 14.1-15.2.
Here is a reproduction of the error: https://godbolt.org/z/EesKrz8v1
