This small C++ 20 project using C++ modules demonstrates a compiler error present in:
Microsoft (R) C/C++ Optimizing Compiler Version 19.43.34809 for x64
The console output of the program is (example):
Inside f():
X::Impl::Impl() of module X.A called. id_ is 42
X::Impl::Impl() of module X.B called.
Cleanup of f():
X::Impl::~Impl() of module X.A called. id_ is 1551069797
X::Impl::~Impl() of module X.A called. id_ is 42
During the cleanup of function f in mod_test.cpp, the wrong destructor ist called. The
program calls the destructor of Impl of Module X.A twice, instead of once. It calls the
destructor of class Impl from the wrong module.
There are two distinct classes both named Impl in module X.A and module X.B. These
classes are not exported, so they should be local to the modules (module linkage).
The project was created with Microsoft Visual Studio Community 2022 (64-bit) Version 17.13.4.
Open the file mod_test.sln.