robot added a comment.

In https://reviews.llvm.org/D42644#993506, @kubamracek wrote:

> Cool. Can we get a lit test as well?


This is our first patch so we're unfamiliar with the LLVM testing 
infrastructure. Could you please tell us what kind of test you'd like? An 
example would also be great.

We still have some concerns regarding the portability of this patch: we don’t 
know how to portably intercept a C++ standard library function (name mangling, 
layout of types, …). In libc++abi, there’s `__cxa_rethrow_primary_exception` 
but it is not used by libstdc++. Instead, libstdc++’s implementation calls 
either `_Unwind_RaiseException` or `_Unwind_SjLj_RaiseException` directly – so 
we’ve intercepted those two for libstdc++. We didn’t check if this helps on 
other platforms (Mac and Windows come to mind).

Additionally, it might be possible there are some other interceptor functions 
missing such as `__cxa_rethrow` (for throw; statements in catch blocks) which 
might lead to analogous false positives (especially if you don’t intercept 
`_Unwind_RaiseException` in the libc++ case).

Arnaud & Robot


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D42644



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