[Lldb-commits] [PATCH] D92103: [ASTImporter] Import the default argument of TemplateTypeParmDecl

Wed Dec 2 03:00:34 PST 2020

teemperor added a comment.

In D92103#2428139 <https://reviews.llvm.org/D92103#2428139>, @martong wrote:

> Hey Raphael, thanks for looking into the CTU crash!
>
> I also had a look and I could reproduce that on Linux Ubuntu 18.04 with GCC 7. I think the discrepancy stems from GCC's libstdc++ and MacOS's libc++ implementation differences of `basic_streambuf`. This is the CXXRecordDecl which does not need an injected class name type (so there is the assert). However, the situation is more complex because there is a 5 long redecl chain (streambuf is forward declared in many places).
>
> Anyway, I don't think that this patch itself caused the crash, it just revealed some other issues that are related to the possibly flawed import logic of injected class (name) types. I am adding another college @balazske as a subscriber because he started to investigate the crash deeper.

Quick note: I should have mention that I actually tried reproducing this issue with libstdc++/GCC 10.2.0 on Arch Linux.

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  https://reviews.llvm.org/D92103/new/

https://reviews.llvm.org/D92103