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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/99446] [11 Regression] ICE in
 linemap_position_for_loc_and_offset, at libcpp/line-map.c:1005 since r11-6325
Date: Mon, 12 Apr 2021 10:11:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99446

Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bernd.edlinger at hotmail =
dot de

--- Comment #7 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Hmm,

I don't fully understand what's the reason why
the assertion fires here.

... but what's apparently wrong here, is the location
before the EOF is in a different file.

While it was intended to show the line above the end-of-file,
it was likely not intended to show the last token in
a different include file?

So something like that fixes the test case:

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 59adac4..99026f4 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -668,7 +668,8 @@ cp_lexer_new_main (void)
                       + lexer->buffer->length ()
                      - 1;

-  if (lexer->buffer->length () !=3D 1)
+  if (lexer->buffer->length () !=3D 1
+      && LOCATION_FILE (tok[-1].location) =3D=3D LOCATION_FILE(tok[0].loca=
tion))
     {
       /* Set the EOF token's location to be the just after the previous
          token's range.  That way 'at-eof' diagnostics point at something=