ChuanqiXu9 wrote:

> The newest version of this patch still doesn't work correctly. Switching the 
> new `LoadExternalSpecializationsLazily` to disabled by default (somehow the 
> argument didn't work on its own) instead crashes, most of the cases involving 
> `MultiOnDiskHashTable`. I suspect some kind of memory error maybe? Sorry to 
> not be more helpful at the moment...

Thanks for testing it. It shows it is really complex. Maybe I am missing some 
points.

> How about taking a step at a time with this patch. Perhaps we should 
> introduce the on-disk hash table infrastructure and always deserialize 
> everything. Then we can verify that part works on our build infrastructure 
> and then move on with the deferring the template loading. I believe that 
> should be relatively easy to achieve with the current version of the patch.
> 
> Essentially I am proposing making `-fno-load-external-specializations-lazily` 
> default so that we can test it without having to modify build 
> infrastructure...

Good suggestion. It sounds good to me. Then we can test it and improve it step 
by step. I've made it. Now anything in the patch shouldn't be accessed without 
`-fload-external-specializations-lazily`.

https://github.com/llvm/llvm-project/pull/76774
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