[clang] [clang][ASTImporter] Fix possible crash at import of function template (PR #124273)

[Michael Buch via cfe-commits]

=?utf-8?q?Balázs_Kéri?= <balazs.keri at ericsson.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/124273 at github.com>


https://github.com/Michael137 commented:

So in spirit this is kind of like an ODR violation right? Which the ASTImporter does try to handle, so this seems reasonable to me. For my own understanding, where did the crash end up happening?

Also, I know you've probably already reduced the reproducer substantially, but is there any chance of making the test even smaller? I assume a mismatching `__get_first_arg` is not all it takes to trigger the crash, so I understand if it's difficult to reduce even further.

https://github.com/llvm/llvm-project/pull/124273