| Issue |
139218
|
| Summary |
[Bazel] `@llvm-project//llvm:Support` fails to build due to incomplete `DelimitedScope`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
hankhsu1996
|
When using `@llvm-project//llvm:Support` in a Bazel project, the build fails because `DelimitedScope` is forward-declared in `ScopedPrinter.h` but never defined. This causes `sizeof(DelimitedScope)` to trigger a compilation error when the compiler instantiates `std::unique_ptr<DelimitedScope>`.
Reproduce:
1. Add `@llvm-project//llvm:Support` as a dependency in a `cc_library`.
2. Include `<llvm/Support/Allocator.h>` (which transitively pulls in `ScopedPrinter.h`).
3. Build with Clang or GCC.
Observed error:
```
error: invalid application of 'sizeof' to an incomplete type 'llvm::DelimitedScope'
```
This blocks downstream projects from using `Support` safely.
Suggested fix: either define `DelimitedScope`, or remove it from the public headers until complete.
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