| Issue |
87224
|
| Summary |
Clang seemingly stuck in an infinite loop
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
nicola-gigante
|
The attached file makes clang 17 take several minutes to compile, and I've never seen it terminate yet (on fast hardware), so I suspect an infinite loop is happening. I did not manage to reduce it because the "problem" is that it takes a lot of time, so `creduce` is not helpful here, unless setting a high timeout and waiting hours.
The culprit is around line 131447.
```
131442 | map_t(class consumer *next, type_mapping_t ty_map, term_mapping_t te_map);
131443 |
131444 | template<typename ...Fs>
131445 | map_t(class consumer *next, Fs ...fs) : map_t(
131446 | next,
131447 | ast::mapping(fs...), ast::mapping(fs...)
131448 | ) { }
```
The second constructor of this class should call the first but the two calls to `act::mapping` produce something that can also match the second constructor arguments and I think this causes an infinite loop. Indeed if I change that line as follows:
```
131447 | type_mapping_t(ast::mapping(fs...)), term_mapping_t(ast::mapping(fs...))
```
then the compilation goes smooth in a few seconds.
This is `clang --version`:
```
Homebrew clang version 17.0.6
Target: arm64-apple-darwin23.3.0
Thread model: posix
InstalledDir: /opt/homebrew/opt/llvm/bin
```
The command line I use is:
```
clang++ -std=c++20 -fsyntax-only -x c++ report.cpp.txt
```
[report.cpp.txt](https://github.com/llvm/llvm-project/files/14822090/report.cpp.txt)
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