https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102341
Bug ID: 102341
Summary: [modules] alias-declaration and typedef-declaration
conflict in module interface unit
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
export module test;
namespace Test
{
typedef long Long;
}
namespace Test
{
export using Long = long;
}
I think this is valid, and it is accepted by 'clang++ -std=c++20' and by
'cl.exe /std:c++20 /experimental:module /interface' but is rejected by G++:
$ g++ -std=c++20 -fmodules-ts -fmodule-only mod.cc
mod.cc:10:27: error: conflicting exporting declaration 'using Long = long int'
10 | export using Long = long;
| ^
mod.cc:5:16: note: previous declaration 'typedef long int Test::Long' here
5 | typedef long Long;
| ^~~~
mod.cc:1:8: warning: not writing module 'test' due to errors
1 | export module test;
| ^~~~~~
