https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80070
--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
The warning is effective disabled when #line directives are present, in
should_warn_for_misleading_indentation:
/* Don't attempt to compare indentation if #line or # 44 "file"-style
directives are present, suggesting generated code.
All bets are off if these are present: the file that the #line
directive could have an entirely different coding layout to C/C++
(e.g. .md files).
To determine if a #line is present, in theory we could look for a
map with reason == LC_RENAME_VERBATIM. However, if there has
subsequently been a long line requiring a column number larger than
that representable by the original LC_RENAME_VERBATIM map, then
we'll have a map with reason LC_RENAME.
Rather than attempting to search all of the maps for a
LC_RENAME_VERBATIM, instead we have libcpp set a flag whenever one
is seen, and we check for the flag here.
*/
if (line_table->seen_line_directive)
return false;
...with another issue being if the .c/.cc file being referred to in the #line
has changed/is available since the linemap/location_t/input.c infrastructure is
set up to handle the referred lines, and not the underlying "physical" lines.
(I have a feeling there's a dup about this somewhere)
