| Issue |
139440
|
| Summary |
-fwhole-program-vtables breaks in combination with -ffat-lto-objects
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Jannik2099
|
the following
```cpp
#include <stdexcept>
struct Foo : std::runtime_error {
Foo() : runtime_error("") {}
};
Foo foo{};
```
when built into an object file with
`clang++ -flto=thin -fwhole-program-vtables -ffat-lto-objects -fPIC -fvisibility=hidden -c foo.cpp -o foo.o`
and then linked into a shared library with
`clang++ -flto=thin -shared foo.o -o foo.so`
will fail with
`ld.lld: error: undefined hidden symbol: vtable for Foo`
Removing either the `-fwhole-program-vtables` or `-ffat-lto-objects` when compiling the object file works fine.
Note that this isn't related to this specific underlying type, I only discovered it with `std::runtime_error` first. Reproduces on libstdc++ and libc++ (when linking dynamically)
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