| Issue |
171548
|
| Summary |
definition with same mangled name when using c++20 modules, templates and libstdc++
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
TroyKomodo
|
`main.cpp`
```cxx
import pollcoro;
import helper;
int main() {
pollcoro::block_on(helper::async(0));
}
```
This fails to compile with the following:
```sh
/nix/store/90lsdrdffwgf3kjd4sdxjchchg44cr02-clang-wrapper-20.1.8/bin/clang++ -O3 -O3 -DNDEBUG -std=c++20 -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT CMakeFiles/thing.dir/src/main.cpp.o -MF CMakeFiles/thing.dir/src/main.cpp.o.d @CMakeFiles/thing.dir/src/main.cpp.o.modmap -o CMakeFiles/thing.dir/src/main.cpp.o -c /home/troy/github/paravision/tmp/src/main.cpp
In module 'pollcoro' imported from /home/troy/github/paravision/tmp/src/main.cpp:8:
In module 'pollcoro:mutex' imported from /home/troy/github/paravision/tmp/build/_deps/pollcoro-src/src/pollcoro.cppm:46:
/nix/store/y28c83zz73yr4vwz1fsl4nsrn6yz5fj0-gcc-14.3.0/include/c++/14.3.0/x86_64-unknown-linux-gnu/bits/gthr-default.h:313:1: error: definition with same mangled name '_ZL18__gthread_active_pv' as another definition
313 | __gthread_active_p (void)
| ^
/nix/store/y28c83zz73yr4vwz1fsl4nsrn6yz5fj0-gcc-14.3.0/include/c++/14.3.0/x86_64-unknown-linux-gnu/bits/gthr-default.h:313:1: note: previous definition is here
313 | __gthread_active_p (void)
| ^
1 error generated.
ninja: build stopped: subcommand failed.
error: Recipe `build` failed on line 2 with exit code 1
```
`helper.cppm`
```cxx
module;
#include <utility>
export module helper;
import pollcoro;
export namespace helper {
template<typename T>
auto async(T value) {
auto [awaitable, setter] = pollcoro::single_event<T>();
setter.set(std::move(value));
return std::move(awaitable);
}
} // helper
```
`pollcoro` is https://github.com/troyKomodo/pollcoro
The following 2 fix the error:
- adding `#include <thread>` to `main.cpp`
- removing the template on `helper` in `helper.cppm`
Reproducible repo: https://github.com/TroyKomodo/cxx-compiler-bug
Possibly related:
https://github.com/llvm/llvm-project/issues/137533
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