| Issue |
172497
|
| Summary |
[clang] Wrong location for libc++.modules.json
|
| Labels |
clang,
libc++
|
| Assignees |
|
| Reporter |
glennvl
|
When trying to use the std module in c++ I encountered an issue that the standard library modules json for libc++ is not found. I first thought it was an issue with cmake, but looking further I noticed that clang returns the wrong path when requesting the location of the libc++ standard library modules json file.
Actual (incorrect) output:
```console
user@28188bd9366e:/workspaces/cpp-devcontainer/test$ clang++ -print-file-name=libc++.modules.json
/lib/x86_64-linux-gnu/libc++.modules.json
```
Expected (correct) output:
```console
user@28188bd9366e:/workspaces/cpp-devcontainer/test$ clang++ -print-file-name=libc++.modules.json
/usr/lib/llvm-21/lib/libc++.modules.json
```
Note that when requesting the `libstdc++` modules json the correct location is returned
```console
user@28188bd9366e:/workspaces/cpp-devcontainer/test$ clang++ -print-file-name=libstdc++.modules.json
/usr/lib/gcc/x86_64-linux-gnu/15/libstdc++.modules.json
```
Clang version I am using:
```console
user@28188bd9366e:/workspaces/cpp-devcontainer/test$ clang --version
Debian clang version 21.1.8 (++20251210013135+4582a800c588-1~exp1~20251210013253.73)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-21/bin
```
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