[Bug preprocessor/108900] [libcpp] cpp gives wrong line number information with a file huge number of lines

[jeremy at bettis dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108900

Jeremy Bettis <jeremy at bettis dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |jeremy at bettis dot org

--- Comment #5 from Jeremy Bettis <jeremy at bettis dot org> ---
I think I've narrowed the problem to the decrement logic in
libcpp/files.cc:_cpp_stack_file().

I think that for locations above LINE_MAP_MAX_LOCATION_WITH_PACKED_RANGES, that
subtracting one from the location is invalid.