| Issue |
93987
|
| Summary |
C++ module with reduced BMI causes undefined vtable error
|
| Labels |
|
| Assignees |
|
| Reporter |
rnikander
|
Two simple files. If I compile with reduced BMI, I get a linker error.
`foo.cppm`:
```
export module foo_mod;
import std;
export struct Foo {
virtual ~Foo() {}
void bar() {
std::cout << "In Foo::bar()\n";
}
};
```
`main.cc`:
```
import foo_mod;
int main() {
Foo foo;
foo.bar();
}
```
If I precompile and compile `foo.cppm` normally, it all runs. If I use the reduced BMI method, passing the extra args to produce the second PCM: `-fexperimental-modules-reduced-bmi -fmodule-output=foo.red.pcm`, then I end up with this error when linking:
```
Undefined symbols for architecture x86_64:
"vtable for Foo@foo_mod", referenced from:
Foo@foo_mod::Foo() in main.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
```
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