[clang] [serialization] no transitive decl change (PR #92083)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> Unfortunately this is still failing one test on the LLDB macOS CI: https://green.lab.llvm.org/job/llvm.org/view/LLDB/job/as-lldb-cmake/5083/execution/node/97/log
> 
> ```
> ======================================================================
> FAIL: test_duplicate_decls_gmodules (TestTemplateWithSameArg.TestTemplateWithSameArg)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1756, in test_method
>     return attrvalue(self)
>   File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/lang/cpp/gmodules/template-with-same-arg/TestTemplateWithSameArg.py", line 66, in test_duplicate_decls
>     self.filecheck("target module dump ast", __file__)
>   File "/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 2293, in filecheck
>     self.assertTrue(cmd_status == 0)
> AssertionError: False is not true
> Config=arm64-/Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/lldb-build/bin/clang
> ----------------------------------------------------------------------
> Ran 2 tests in 1.682s
> 
> FAILED (failures=1)
> ```
> 
> Let me know if you need help reproducing this.
> 
> Looks like we're doing a FileCheck on the imported LLDB AST:
> 
> ```
> FileCheck output:
> 
> /Users/ec2-user/jenkins/workspace/llvm.org/as-lldb-cmake/llvm-project/lldb/test/API/lang/cpp/gmodules/template-with-same-arg/TestTemplateWithSameArg.py:69:10: error: CHECK: expected string not found in input
> # CHECK: ClassTemplateSpecializationDecl {{.*}} imported in Module2 struct ClassInMod3 definition
> ```
> 
> But instead of `imported in Module2 struct ClassInMod3 definition` it's now just `imported struct ClassInMod3 definition`. Maybe we're not setting the module ID correctly in LLDB or something? Does that ring any bells?

@Michael137 hi, how can I run test for it? I tried

```
bin/llvm-lit ../lldb/test/API/lang/cpp/gmodules/template-with-same-arg/TestTemplateWithSameArg.py
```

but it shows it can't work

https://github.com/llvm/llvm-project/pull/92083