https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119863
Bug ID: 119863
Summary: [modules] Bogus conflicting friend template
declaration
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pilarlatiesa at gmail dot com
Target Milestone: ---
$ cat Test.cpp
export module m;
template<typename>
class T;
template<typename>
class U
{
template<typename>
friend class T;
};
template<typename V>
class T
{
U<V> x = {};
};
export
template<typename V>
T<V> f(V) { return {}; }
$ cat main.cpp
import m;
int main()
{
auto const x = f(1);
}
$ ~/gcc-15/bin/g++ -fmodules -c Test.cpp -fmodule-only
$ ~/gcc-15/bin/g++ -fmodules main.cpp
In module m, imported at main.cpp:2:
Test.cpp: In instantiation of ‘class U@m<int>’:
Test.cpp:17:8: required from ‘class T@m<int>’
17 | U<V> x = {};
| ^
main.cpp:6:19: required from here
6 | auto const x = f(1);
| ~^~~
Test.cpp:11:16: error: conflicting declaration of template ‘template<class>
class T@m’
11 | friend class T;
| ^
Test.cpp:5:7: nota: previous declaration ‘template<class> class T@m’
5 | class T;
| ^
$ ~/gcc-15/bin/g++ -v
Usando especificaciones internas.
COLLECT_GCC=/home/pililatiesa/gcc-15/bin/g++
COLLECT_LTO_WRAPPER=/home/pililatiesa/gcc-15/libexec/gcc/x86_64-pc-linux-gnu/15.0.1/lto-wrapper
Objetivo: x86_64-pc-linux-gnu
Configurado con: ../gcc-15.1.0-RC-20250418/configure --disable-multilib
--disable-bootstrap --enable-languages=c,c++ --prefix=/home/pililatiesa/gcc-15/
Modelo de hilos: posix
Algoritmos de compresión LTO admitidos: zlib zstd
gcc versión 15.0.1 20250418 (prerelease) (GCC)
