dblaikie added a comment.

In https://reviews.llvm.org/D47492#1120599, @jankratochvil wrote:

> FYI I have filed it for libstdc++ but I did not really understand their 
> reaction: Bug 86013 - std::vector::shrink_to_fit() could sometimes use 
> realloc() <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86013>


Happy to help explain it - which part(s) are you having a bit of trouble with?

It seems like the main one is that the implementation can't be sure that malloc 
was used to allocate the memory - since the global allocation function can be 
replaced & there's no convenient way to detect that.


Repository:
  rL LLVM

https://reviews.llvm.org/D47492



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