https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126869
Bug ID: 126869
Summary: Loss of character due to adding header
Product: gcc
Version: 16.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: d7d1cd at mail dot ru
Target Milestone: ---
I encountered the following problem when using module partitions. I have this
header:
$ cat foo.h
#pragma once
class Foo {};
It's added to the M module partition:
$ cat foo.ixx
module;
#include "foo.h"
export module M : foo;
export using ::Foo;
The module interface looks like this:
$ cat module.ixx
module;
#include "foo.h"
export module M;
export import : foo;
The module is used as follows:
$ cat main.cc
import M;
int main() {
Foo f;
}
When compiling these files, I get the following error:
$ g++ -std=c++23 -fmodules foo.ixx module.ixx main.cc
main.cc: In function ‘int main()’:
main.cc:3:5: error: ‘Foo’ was not declared in this scope
3 | Foo f;
| ^~~
If I remove the header inclusion from the interface, the compilation succeeds.
Here's an example in the online compiler: https://godbolt.org/z/Mo6oKW7vh
