teresajohnson wrote:

> #87600 is a functional change and the diffbase of this patch, and 
> `llvm/test/ThinLTO/X86/import_callee_declaration.ll` should be a test case 
> for both patches.
> 
> In the [diffbase](https://github.com/llvm/llvm-project/pull/87600), bitcode 
> writer takes maps as additional parameters to populate import status, and 
> it's not straightforward to construct regression tests there without this 
> patch. I wonder if I shall introduce `cl::list<std::string>` in 
> llvm-lto/llvm-lto2 (as a repeated arg) to specify `filename:GUID` to test the 
> diffbase alone.

Rather than add an option just for testing that one alone, I have a suggestion 
for splitting up the PRs slightly differently. What if you submitted this one 
first, minus the modified calls to writeIndexToFile and the part of the test 
that checks the disassembled index (just have the testing for this one check 
the number of declarations imported and other debug messages). Then move the 
modified calls to writeIndexToFile and the index disassembly checking to 
PR87600 that can be committed as a follow on? That way each change comes with a 
test.

https://github.com/llvm/llvm-project/pull/88024
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