https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120349
Nathaniel Shead <nshead at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Target Milestone|--- |16.0
Summary|[16 regression] |[16 regression]
|std::println link fail with |std::println link fail with
|std module |std module since
| |r16-688-gc875748cdc468e
Blocks| |103524
Assignee|unassigned at gcc dot gnu.org |nshead at gcc dot
gnu.org
Last reconfirmed| |2025-05-19
Keywords| |link-failure
CC| |nshead at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
--- Comment #1 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
Confirmed. Minimal reproducer:
// a.cpp
module;
struct S {
virtual ~S() {}
};
struct D : S {};
export module M;
export using ::D;
// b.cpp
import M;
int main() { D d; }
$ g++-16 -fmodules a.cpp b.cpp
/usr/bin/ld: /tmp/ccym3Ujw.o: in function `S::~S()':
b.cpp:(.text._ZN1SD2Ev[_ZN1SD5Ev]+0x9): undefined reference to `vtable for S'
collect2: error: ld returned 1 exit status
It looks like I was overzealous in cleaning up some of the special-casing for
vtable linkage.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103524
[Bug 103524] [meta-bug] modules issue
