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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/115960] gcc throws an error when I use Optional in c++17.
Date: Tue, 16 Jul 2024 22:14:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115960

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Anyways this is not a GCC issue.

The   AttrBuilder::addAllocSizeAttr is declared in the preprocessed source =
as:
AttrBuilder &addAllocSizeAttr(unsigned ElemSizeArg,
                                const std::optional<unsigned> &NumElemsArg);

But the upstream is defined as:

  AttrBuilder &addAllocSizeAttr(unsigned ElemSizeArg,
                                const Optional<unsigned> &NumElemsArg);


https://github.com/hdoc/llvm-project/blob/a38b25fa77bdf1437c690494ae6d61179=
b3bb4f8/llvm/include/llvm/IR/Attributes.h#L1188


Also note
https://github.com/llvm/llvm-project/commit/125f4457a54a550846732763ee36b14=
47ec8d66e


Anyways this still not a GCC bug.=