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From: "helmut at subdivi dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/80755] __has_include_next: internal compiler
 error: NULL directory in find_file
Date: Mon, 31 Oct 2022 09:46:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D80755

Helmut Grohne <helmut at subdivi dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |helmut at subdivi dot de

--- Comment #2 from Helmut Grohne <helmut at subdivi dot de> ---
Created attachment 53801
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53801&action=3Dedit
proposed fix

I confirm the issue on gcc 12.2.0-3 on Debian and have seen it since at lea=
st
version 11. The symptom is slightly different though. It no longer produces=
 an
ICE. Instead the output looks like this:

    lastincdir/testcase.h:1:24: error: no include path in which to search f=
or
doesnotexist.h
    ...
    (null):0: confused by earlier errors, bailing out

The invocation terminates with status 1.

While this no longer is an ICE, the behavior is not correct either.
__has_include_next should not error out and return false-ish instead.

I believe that looking at the attached patch makes the problem fairly obvio=
us.

This problem now affects toolchain bootstrap on Debian for hurd architectur=
es.
The stage1 preprocessor happens to run into this very early.=