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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100977] [C++23] Implement C++ Identifier Syntax using
 Unicode Standard Annex 31
Date: Wed, 04 Aug 2021 14:08:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100977

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51258
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51258&action=3Dedit
gcc12-pr100977-1.patch

I think I found a bug in the makeucnid.c program, sometimes the ranges are
split
even when they contain the identical flags and combining value (which resul=
ts
in
unnecessarily large table), but in other cases, e.g.
U+0483 to U+0487 inclusive are combining 230 and U+0488 is combining 0,
but the generated file had:
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0,   0, 0x0482 },
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0, 230, 0x0483 },
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0, 230, 0x0484 },
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0, 230, 0x0485 },
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0, 230, 0x0486 },
{   0|  0|  0|C11|  0|CID|NFC|NKC|  0,   0, 0x048f },
i.e. 0x0487 would be handled as non-combining.=