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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/102607] New: [modules] option -g results in undefined
 reference to `typeinfo for type`
Date: Tue, 05 Oct 2021 14:43:51 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: link-failure
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102607

            Bug ID: 102607
           Summary: [modules] option -g results in undefined reference to
                    `typeinfo for type`
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: link-failure
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See https://godbolt.org/z/qP6EPWhEz.

mod.cpp:
```C++
export module mod;
export struct B {
  virtual ~B() =3D default;
};
```

main.cpp:
```C++
import mod;
int main() {
  struct D : B {};
  (void)D{};
}
```

Commands:
```
g++ -std=3Dc++23 -fmodules-ts -g -c mod.cpp
g++ -std=3Dc++23 -fmodules-ts -g -c main.cpp
g++ mod.o main.o
```

Output:
```
/usr/bin/ld: main.o:(.data.rel.ro+0x8): undefined reference to `typeinfo fo=
r B'
/usr/bin/ld: main.o:(.data.rel.ro+0x30): undefined reference to `typeinfo f=
or
B'
collect2: error: ld returned 1 exit status
```=