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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/97583] New: Unknown mode_attribute (or
 iterator) ignored
Date: Mon, 26 Oct 2020 18:08:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97583

            Bug ID: 97583
           Summary: Unknown mode_attribute (or iterator) ignored
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: segher at gcc dot gnu.org
  Target Milestone: ---

This leads to errors at compiler runtime instead of at compiler build time.
See https://gcc.gnu.org/pipermail/gcc-patches/2020-October/556998.html .

Code from md_reader::apply_iterator_to_string :

      p =3D start + 1;

      *end =3D 0;
      v =3D map_attr_string (loc, p);
      *end =3D '>';
      if (v =3D=3D 0)
        continue;

It could report an error instead.=