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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102350] __builtin_source_location not available in earlier
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Date: Thu, 16 Sep 2021 09:50:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102350

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Note, having the struct somewhere else isn't that useful unless you know
exactly how its non-static data members are named and what they mean, so
ideally a class with accessor methods, which is what std::source_location
provides currently.

At least during the development of __builtin_source_location, the exact nam=
ing
conventions of the members was left to the library (whether it wants _M_ or=
 __
prefixes of the member names), the final implementation uses the libstdc++
naming conventions, but I bet if e.g. libc++ implements <source_location> we
could add support even for __ prefixes.=