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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/96935] [9/10/11 Regression] ICE in subspan, at
 input.h:69
Date: Wed, 16 Sep 2020 02:58:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96935

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Candidate fix:

--- a/gcc/input.c
+++ b/gcc/input.c
@@ -1461,6 +1461,8 @@ get_substring_ranges_for_loc (cpp_reader *pfile,
       size_t literal_length =3D finish.column - start.column + 1;

       /* Ensure that we don't crash if we got the wrong location.  */
+      if (start.column < 1)
+   return "line is too long";
       if (line.length () < (start.column - 1 + literal_length))
    return "line is not wide enough";=