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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/96935] ICE in subspan, at input.h:69
Date: Fri, 04 Sep 2020 12:04:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96935

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Guess the error is simply that we fall back to no columns and thus start.co=
lumn
=3D=3D 0 and we do

      char_span literal =3D line.subspan (start.column - 1, literal_length);

which means input.c:1467 should check whether start.column is >=3D 1

Might also trigger with

printf ("\
......")

who knows.

Your backtrace doesn't contain function argument values to verify.  Maybe y=
ou
can
build GCC with -O0 once and check?=