| Issue |
169634
|
| Summary |
[libc++] `module.modulemap.in` should export `std.functional.hash` in modules for some standard library headers
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
frederick-vs-ja
|
Per [[unord.hash]/2](https://eel.is/c++draft/unord.hash#2), components in `<__functional/hash.h>` should be available in the following headers:
- `<bitset>`
- `<chrono>` (since C++26; changes being implemented)
- `<coroutine>`
- `<filesystem>`
- `<functional>`
- `<memory>`
- `<optional>`
- `<stacktrace>` (not yet implemented)
- `<string>`
- `<string_view>`
- `<system_error>`
- `<text_encoding>` (not yet implemented)
- `<typeindex>` (buggy now; see #129723)
- `<thread>`
- `<variant>`
- `<vector>`
- `<utility>` (since C++26)
In Clang module builds, it should also be valid to obtain the components by including one of the these headers. However, it was observed in #169611 that this didn't work.
Presumably we need to fix `module.modulemap.in` by exporting `std.functional.hash` wherever suitable.
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