| Issue |
100924
|
| Summary |
[clangd+modules] Clangd reports ODR violation when including iostream from (global module fragment of) two different modules
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
alfaix
|
Hey, I'm trying to get modules to work with clangd following [this PR](https://github.com/llvm/llvm-project/pull/66462).
However, when I run `clangd` with the following files:
```cpp
// b.cppm
module;
#include <iostream>
export module b;
export template <class T>
concept C = requires() {
{ T::foo } -> std::convertible_to<int>;
};
// c.cppm
module;
#include <iostream>
export module c;
import b;
class B {
public:
static constexpr int foo = 1;
};
export template <class T>
requires C<T>
class D {};
int main() { D<B> s; }
```
Put `-std=c++23 -stdlib=libc++` and all the `-fmodule` things in `compile_commands.json`, clangd reports an ODR violation, saying the 2 definitions of `std::error_category` from the 2 includes are different: `E[12:04:26.095] [module_odr_violation_missing_decl] Line 3: in included file: 'std::error_category::message' from module '' is not present in definition of 'std::error_category' in module 'b.<global>'`
The setup is sensitive to small changes - e.g., removing std::convertible from the concept leads to the error disappearing. I put the repro in a [small repo](https://github.com/alfaix/clangd-odr-repro) for convenience.
Tested with `Ubuntu clang version 20.0.0 (++20240727042143+9a3e66e314e6-1~exp1~20240727042317.1828)` straight out of apt.llvm.org snapshot repo.
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