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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/56659] Segfault due to missing libcpp error handler for
 "gfortran -cpp"
Date: Thu, 07 Oct 2021 10:44:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56659

--- Comment #8 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to kapinos from comment #7)
> The output of gfortran 10.2.0 was added previously, cf.
>  > f951: Warning: Include directory =E2=80=98./foo/bar=E2=80=99: Permissi=
on denied
>  > f951: internal compiler error: in cpp_diagnostic_at, at libcpp/errors.=
c:41

I can reproduce this with GCC 7 to 10. But with my patch for PR 100904 (see
commit there), this is fixed in GCC 12:

  f951: Warning: Include directory =E2=80=98foo/bar/=E2=80=99: Permission d=
enied
  <built-in>: Error: foo/bar: Permission denied

(The <built-in> shows up when entering a file but the file is not yet there.
Not ideal,
but not that quick to fix. Once the file is read, that's replaced by the fi=
le
name and line number. Still, the <built-in> issue should be fixed eventuall=
y.)=