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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/77691] [8/9/10/11 regression]
 experimental/memory_resource/resource_adaptor.cc FAILs
Date: Wed, 17 Feb 2021 16:46:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D77691

--- Comment #46 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to John David Anglin from comment #45)
> It seems we have 8-byte alignment specified using std::max_align_t and
> 16-byte
> alignment for pthread mutexes and malloc.

That's not a libstdc++ issue though. std::max_align_t isn't defined by
libstdc++, it comes from GCC's stddef.h=