https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115231
Bug ID: 115231
Summary: [C++20] [Modules] deduction guides reachability
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: huangqinjin at gmail dot com
Target Milestone: ---
Refer to https://eel.is/c++draft/temp.deduct.guide#nt:deduction-guide,
> Deduction guides are not found by name lookup.
> Instead, when performing class template argument deduction,
> all reachable deduction guides declared for the class template are considered.
GCC cannot find the deduction guides that are not exported, while both Clang
and MSVC can.
https://godbolt.org/z/9rW3TTMMM
