https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70090

--- Comment #2 from Daniel Micay <danielmicay at gmail dot com> ---
This has now been implemented in Clang as __builtin_dynamic_object_size.
There's a thread on the GCC mailing list about it at
https://www.mail-archive.com/gcc@gcc.gnu.org/msg87230.html.

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