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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103121] [12 Regression] Warnings in
 cp/optimize.c causing build failure
Date: Mon, 08 Nov 2021 09:24:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103121

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
  grp_name =3D XALLOCAVEC (char, IDENTIFIER_LENGTH (complete_name) + 1);

so the array is at least of size 1.  David, can you try adding
-fno-tree-vectorize to the command line to see if that silences the diagnos=
tic?=